View LTC6244HVHDD_9042996.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ltc6244 1 6244fb dual 50mhz, low noise, rail-to-rail, cmos op amp the ltc ? 6244 is a dual high speed, unity-gain stable cmos op amp that features a 50mhz gain bandwidth, 40v/s slew rate, 1pa of input bias current, low input capacitance and rail-to-rail output swing. the 0.1hz to 10hz noise is just 1.5v p-p and 1khz noise is guaranteed to be less than 12nv/ hz . this excellent ac and noise performance is combined with wide supply range operation, a maximum offset voltage of just 100v and drift of only 2.5v/c, making it suitable for use in many fast signal processing applications, such as photodiode ampli? ers. this op amp has an output stage that swings within 35mv of either supply rail to maximize the signal dynamic range in low supply applications. the input common mode range extends to the negative supply. it is fully speci? ed on 3v and 5v, and an hv version guarantees operation on supplies of 5v. the ltc6244 is available in the 8-pin msop, and for com- pact designs, it is packaged in the tiny dual ? ne pitch lead free (dfn) package. n photodiode ampli? ers n charge coupled ampli? ers n low noise signal processing n active filters n medical instrumentation n high impedance transducer ampli? er n input bias current: 1pa (typ at 25c) n low offset voltage: 100v max n low offset drift: 2.5v/c max n 0.1hz to 10hz noise: 1.5v p-p n slew rate: 40v/s n gain bandwidth product: 50mhz n output swings rail-to-rail n supply operation: 2.8v to 6v ltc6244 2.8v to 5.25v ltc6244hv n low input capacitance: 2.1pf n available in 8-pin msop and tiny dfn packages very low noise large area photodiode v os distribution typical application description features applications 5v v out = 1m ? i pd bw = 350khznoise = 291nv at 10khz 5v v bb i pd 1m philips bf862 jfet hamamatsu large area photodiode s1227-1010bq c pd = 3000pf * can be microphonic, film, x7r, if needed. 0.25pf C5v 6244 ta01a C + 1/2 ltc6244hv C5v 4.99k 4.7f* 4.99k v out input offset voltage (v) C60 C40 number of units 60 80 100 120 60 6244 ta01b 40 20 50 70 90 110 30 10 0 C20 0 20 40 ltc6244ms8 v s = 5v, 0v v cm = 2.5v t a = 25c l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. downloaded from: http:///
ltc6244 2 6244fb total supply voltage (v + to v C ) ltc6244 ..................................................................7v ltc6244hv ...........................................................12v input voltage .......................... (v + + 0.3v) to (v C C 0.3v) input current ........................................................10ma output short circuit duration (note 2)............. inde? nite operating temperature range ltc6244c ............................................ C40c to 85c ltc6244i.............................................. C40c to 85c ltc6244h .......................................... C40c to 125c (note 1) speci? ed temperature range (note 3) ltc6244c ................................................ 0c to 70c ltc6244i.............................................. C40c to 85c ltc6244h .......................................... C40c to 125c junction temperature ........................................... 150c storage temperature range ................... C65c to 150c lead temperature (soldering, 10 sec) .................. 300c absolute maximum ratings lead free finish tape and reel part marking package description specified temperature range ltc6244cdd#pbf ltc6244cdd#trpbf lccf 8-lead (3mm 3mm) plastic dfn 0c to 70c ltc6244hvcdd#pbf ltc6244hvcdd#trpbf lcgd 8-lead (3mm 3mm) plastic dfn 0c to 70c ltc6244idd#pbf ltc6244idd#trpbf lccf 8-lead (3mm 3mm) plastic dfn C40c to 85c ltc6244hvidd#pbf ltc6244hvidd#trpbf lcgd 8-lead (3mm 3mm) plastic dfn C40c to 85c ltc6244hdd#pbf ltc6244hdd#trpbf lccf 8-lead (3mm 3mm) plastic dfn C40c to 125c LTC6244HVHDD#pbf LTC6244HVHDD#trpbf lcgd 8-lead (3mm 3mm) plastic dfn C40c to 125c ltc6244cms8#pbf ltc6244cms8#trpbf ltccm 8-lead plastic msop 0c to 70c ltc6244hvcms8#pbf ltc6244hvcms8#trpbf ltcgf 8-lead plastic msop 0c to 70c ltc6244ims8#pbf ltc6244ims8#trpbf ltccm 8-lead plastic msop C40c to 85c ltc6244hvims8#pbf ltc6244hvims8#trpbf ltcgf 8-lead plastic msop C40c to 85c ltc6244hms8#pbf ltc6244hms8#trpbf ltccm 8-lead plastic msop C40c to 125c consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on non-standard lead based ? nish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/ order information top view 9 dd package 8-lead (3mm 3mm) plastic dfn 5 6 7 8 4 3 2 1 out a Cin a+in a v C v + out bCin b +in b b a t jmax = 150c, ja = 43c/w exposed pad (pin 9) conneected to v C (pcb connection optional) 12 3 4 out a Cin a+in a v C 87 6 5 v + out bCin b +in b top view ms8 package 8-lead plastic msop t jmax = 150c, ja = 250c/w pin configuration downloaded from: http:///
ltc6244 3 6244fb (ltc6244c/i, ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 2.5v unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage (note 4) ms8 package 0c to 70cC40c to 85c ll 40 100 225300 vv v dd package0c to 70c C40c to 85c ll 100 650 800950 vv v v os match channel-to-channel (note 5) ms8 package 0c to 70cC40c to 85c ll 40 160 275325 vv v dd package0c to 70c C40c to 85c ll 150 800 900 1.1 vv mv tc v os input offset voltage drift, ms8 (note 6) l 0.7 2.5 v/c i b input bias current (notes 4, 7) l 1 75 papa i os input offset current (notes 4, 7) l 0.5 75 papa input noise voltage 0.1hz to 10hz 1.5 v p-p e n input noise voltage density f = 1khz 8 12 nv/ hz i n input noise current density (note 8) 0.56 fa/ hz r in input resistance common mode 10 12 c in input capacitance differential mode common mode f = 100khz 3.52.1 pfpf v cm input voltage range guaranteed by cmrr l 0 3.5 v cmrr common mode rejection 0v v cm 3.5v l 74 105 db cmrr matchchannel-to-channel (note 5) l 72 100 db a vol large signal voltage gain v o = 1v to 4v r l = 10k to v s /2 0c to 70cC40c to 85c ll 1000 600450 2500 v/mv v/mv v/mv v o = 1.5v to 3.5v r l = 1k to v s /2 0c to 70cC40c to 85c ll 300200 150 1000 v/mv v/mv v/mv v ol output voltage swing low (note 9) no load i sink = 1ma i sink = 5ma ll l 1540 150 3575 300 mvmv mv v oh output voltage swing high (note 9) no load i source = 1ma i source = 5ma ll l 1545 175 3575 325 mvmv mv psrr power supply rejection v s = 2.8v to 6v, v cm = 0.2v l 75 105 db psrr matchchannel-to-channel (note 5) l 73 100 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 25 35 ma i s supply current per ampli? er l 6.25 7.4 ma electrical characteristics downloaded from: http:///
ltc6244 4 6244fb (ltc6244c/i, ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 2.5v unless otherwise noted. symbol parameter conditions min typ max units gbw gain bandwidth product frequency = 100khz, r l = 1k l 35 50 mhz sr slew rate (note 11) a v = C2, r l = 1k l 18 35 v/s fpbw full power bandwidth (note 12) v out = 3v p-p , r l = 1k l 1.9 3.7 mhz t s settling time v step = 2v, a v = C1, r l = 1k, 0.1% 535 ns symbol parameter conditions min typ max units v os input offset voltage (note 4) ms8 package 0c to 70cC40c to 85c ll 40 175 250325 vv v dd package0c to 70c C40c to 85c ll 100 650 800950 vv v v os match channel-to-channel (note 5) ms8 package 0c to 70cC40c to 85c ll 40 200 300350 vv v dd package0c to 70c C40c to 85c ll 150 800 900 1.1 vv mv i b input bias current (notes 4, 7) l 1 75 papa i os input offset current (notes 4, 7) l 0.5 75 papa input noise voltage 0.1hz to 10hz 1.5 v p-p e n input noise voltage density f = 1khz 8 12 nv/ hz i n input noise current density (note 8) 0.56 fa/ hz v cm input voltage range guaranteed by cmrr l 0 1.5 v cmrr common mode rejection 0v v cm 1.5v l 70 105 db cmrr matchchannel-to-channel (note 5) l 68 100 db a vol large signal voltage gain v o = 1v to 2v r l = 10k to v s /2 0c to 70cC40c to 85c ll 200100 85 800 v/mv v/mv v/mv v ol output voltage swing low (note 9) no load i sink = 1ma ll 1245 30 110 mvmv v oh output voltage swing high (note 9) no load i source = 1ma ll 1250 30 110 mvmv psrr power supply rejection v s = 2.8v to 6v, v cm = 0.2v l 75 105 db psrr matchchannel-to-channel (note 5) l 73 100 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 81 5 m a (ltc6244c/i, ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 3v, 0v, v cm = 1.5v unless otherwise noted. electrical characteristics downloaded from: http:///
ltc6244 5 6244fb (ltc6244c/i, ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 3v, 0v, v cm = 1.5v unless otherwise noted. symbol parameter conditions min typ max units i s supply current per ampli? er l 4.8 5.8 ma gbw gain bandwidth product frequency = 100khz, r l = 1k l 35 50 mhz (ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 0v unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage (note 4) ms8 package 0c to 70cC40c to 85c ll 50 220 275375 vv v dd package0c to 70c C40c to 85c ll 100 700 800 1050 vv v v os match channel-to-channel (note 5) ms8 package 0c to 70cC40c to 85c ll 50 250 325400 vv v dd package0c to 70c C40c to 85c ll 150 900 10001100 vv v tc v os input offset voltage drift, ms8 (note 6) l 0.7 2.5 v/c i b input bias current (notes 4, 7) l 1 75 papa i os input offset current (notes 4, 7) l 0.5 75 papa input noise voltage 0.1hz to 10hz 1.5 v p-p e n input noise voltage density f = 1khz 8 12 nv/ hz i n input noise current density (note 8) 0.56 fa/ hz r in input resistance common mode 10 12 c in input capacitance differential mode common mode f = 100khz 3.52.1 pfpf v cm input voltage range guaranteed by cmrr l C5 3.5 v cmrr common mode rejection C5v v cm 3.5v l 80 105 db cmrr matchchannel-to-channel (note 5) l 78 95 db a vol large signal voltage gain v o = C3.5v to 3.5v r l = 10k 0c to 70cC40c to 85c ll 25001500 1200 6000 v/mv v/mv v/mv r l = 1k 0c to 70cC40c to 85c ll 700400 300 3500 v/mv v/mv v/mv v ol output voltage swing low (note 9) no load i sink = 1ma i sink = 10ma ll l 1545 360 4075 550 mvmv mv v oh output voltage swing high (note 9) no load i source = 1ma i source = 10ma ll l 1545 360 4075 550 mvmv mv electrical characteristics downloaded from: http:///
ltc6244 6 6244fb symbol parameter conditions min typ max units v os input offset voltage (note 4) ms8 package l 40 125 400 vv dd8 package l 100 650 950 vv v os match channel-to-channel (note 5) ms8 package l 40 160 400 vv dd8 packageC40c to 125c l 150 800 1160 vv tc v os input offset voltage drift, ms8 (note 6) l 0.7 2.5 v/c i b input bias current (notes 4, 7) l 1 2 pana i os input offset current (notes 4, 7) l 0.5 250 papa v cm input voltage range guaranteed by cmrr l 0 3.5 v cmrr common mode rejection 0v v cm 3.5v l 74 db cmrr match channel-to-channel (note 5) l 72 db a vol large signal voltage gain v o = 1v to 4v r l = 10k to v s /2 l 350 v/mv v o = 1.5v to 3.5v r l = 1k to v s /2 l 125 v/mv v ol output voltage swing low (note 9) no load i sink = 1ma i sink = 5ma ll l 4085 325 mvmv mv v oh output voltage swing high (note 9) no load i source = 1ma i source = 5ma ll l 4085 325 mvmv mv symbol parameter conditions min typ max units psrr power supply rejection v s = 2.8v to 10.5v, v cm = 0.2v l 75 110 db psrr matchchannel-to-channel (note 5) l 73 106 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 40 55 ma i s supply current per ampli? er l 7 8.8 ma gbw gain bandwidth product frequency = 100khz, r l = 1k l 35 50 mhz sr slew rate (note 11) a v = C2, r l = 1k l 18 40 v/s fpbw full power bandwidth (note 12) v out = 3v p-p , r l = 1k l 1.9 4.25 mhz t s settling time v step = 2v, a v = C1, r l = 1k, 0.1% 330 ns (ltc6244hvc/i) the l denotes the speci? cations which apply over the speci? ed temperature range, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 0v unless otherwise noted. (ltc6244h) the l denotes the speci? cations which apply from C40c to 125c, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 2.5v unless otherwise noted. electrical characteristics downloaded from: http:///
ltc6244 7 6244fb (ltc6244h) the l denotes the speci? cations which apply from C40c to 125c, otherwise speci? cations are at t a = 25c. v s = 5v, 0v, v cm = 2.5v unless otherwise noted. symbol parameter conditions min typ max units psrr power supply rejection v s = 2.8v to 6v, v cm = 0.2v l 75 db psrr match channel-to-channel (note 5) l 73 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 20 ma i s supply current per ampli? er l 6.25 7.4 ma gbw gain bandwidth product frequency = 100khz, r l = 1k l 30 mhz sr slew rate (note 11) a v = C2, r l = 1k l 17 v/s fpbw full power bandwidth (note 12) v out = 3v p-p , r l = 1k l 1.8 mhz (ltc6244h) the l denotes the speci? cations which apply from C40c to 125c, otherwise speci? cations are at t a = 25c. v s = 3v, 0v, v cm = 1.5v unless otherwise noted. symbol parameter conditions min typ max units v os input offset voltage (note 4) ms8 package l 40 175 400 vv dd8 package l 100 650 950 vv v os match channel-to-channel (note 5) ms8 package l 40 160 400 vv dd8 package l 150 800 1200 vv i b input bias current (notes 4, 7) l 1 2 pana i os input offset current (notes 4, 7) l 0.5 250 papa v cm input voltage range guaranteed by cmrr l 0 1.5 v cmrr common mode rejection 0v v cm 1.5v l 70 db cmrr match channel-to-channel (note 5) l 68 db a vol large signal voltage gain v o = 1v to 2v r l = 10k to v s /2 l 75 v/mv v ol output voltage swing low (note 9) no load i sink = 1ma ll 30 110 mvmv v oh output voltage swing high (note 9) no load i source = 1ma ll 30 110 mvmv psrr power supply rejection v s = 2.8v to 6v, v cm = 0.2v l 75 db psrr match channel-to-channel (note 5) l 73 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 5m a i s supply current per ampli? er l 4.8 5.8 ma gbw gain bandwidth product frequency = 100khz, r l = 1k l 28 mhz electrical characteristics downloaded from: http:///
ltc6244 8 6244fb (ltc6244hvh) the l denotes the speci? cations which apply from C40c to 125c, otherwise speci? cations are at t a = 25c. v s = 5v, v cm = 0v unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units v os input offset voltage (note 4) dd8 package l 100 700 1050 vv v os match channel-to-channel (note 5) dd8 package l 150 900 1165 vv tc v os input offset voltage drift, ms8 (note 6) l 0.7 2.5 v/c i b input bias current (notes 4, 7) l 1 2 pana i os input offset current (notes 4, 7) l 0.5 250 pana input noise voltage 0.1hz to 10hz 1.5 v p-p e n input noise voltage density f = 1khz 8 12 nv/ hz i n input noise current density (note 8) 0.56 fa/ hz r in input resistance common mode 10 12 c in input capacitance differential mode common mode f = 100khz 3.52.1 pfpf v cm input voltage range guaranteed by cmrr l C5 3.5 v cmrr common mode rejection C5v v cm 3.5v l 80 105 db cmrr match channel-to-channel (note 5) l 78 95 db a vol large signal voltage gain v o = C3.5v to 3.5v r l = 10k l 25001000 6000 v/mv v/mv r l = 1k l 700170 3500 v/mv v/mv v ol output voltage swing low (note 9) no load i sink = 1ma i sink = 10ma ll l 1545 360 4075 550 mvmv mv v oh output voltage swing high (note 9) no load i source = 1ma i sink = 10ma ll l 1545 360 4075 550 mvmv mv psrr power supply rejection v s = 2.8v to 10.5v, v cm = 0.2v l 75 110 db psrr match channel-to-channel (note 5) l 73 106 db minimum supply voltage (note 10) l 2.8 v i sc short-circuit current l 40 55 ma i s supply current per ampli? er l 9.3 ma gbw gain bandwidth product frequency = 100khz, r l = 1k l 35 50 mhz sr slew rate (note 11) a v = C2, r l = 1k l 18 40 v/s fpbw full power bandwidth (note 12) v out = 3v p-p , r l = 1k l 1.9 4.3 mhz t s settling time v out = 2v, a v = C1 , r l =1k l 330 ns downloaded from: http:///
ltc6244 9 6244fb note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: a heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted inde? nitely. note 3: the ltc6244c/ltc6244hvc are guaranteed to meet speci? ed performance from 0c to 70c. they are designed, characterized and expected to meet speci? ed performance from C40c to 85c, but are not tested or qa sampled at these temperatures. the ltc6244i/ltc6244hvi, are guaranteed to meet speci? ed performance from C40c to 85c. the ltc6244h is guaranteed to meet speci? ed performance from C40c to 125c. note 4: esd (electrostatic discharge) sensitive device. esd protection devices are used extensively internal to the ltc6244; however, high electrostatic discharge can damage or degrade the device. use proper esd handling precautions. note 5: matching parameters are the difference between the two ampli? ers of the ltc6244. cmrr and psrr match are de? ned as follows: cmrr and psrr are measured in v/v on the ampli? ers. the difference is calculated between the sides in v/v. the result is converted to db. note 6: this parameter is not 100% tested. note 7: this speci? cation is limited by high speed automated test capability. see typical characteristics curves for actual typical performance. note 8: current noise is calculated from the formula: i n = (2qi b ) 1/2 where q = 1.6 10 C19 coulomb. the noise of source resistors up to 50g dominates the contribution of current noise. see also typical characteristics curve noise current vs frequency. note 9: output voltage swings are measured between the output and power supply rails.note 10: minimum supply voltage is guaranteed by the power supply rejection ratio test.note 11: slew rate is measured in a gain of C2 with r f = 1k and r g = 500. v in is 1v and v out slew rate is measured between C1v and +1v. on the ltc6244hv/ltc6245hv, v in is 2v and v out slew rate is measured between C2v and +2v. note 12: full-power bandwidth is calculated from the slew rate: fpbw = sr/2v p . electrical characteristics downloaded from: http:///
ltc6244 10 6244fb v os distribution v os distribution v os temperature coef? cient distribution supply current vs supply voltage (per ampli? er) offset voltage vs input common mode voltage input bias current vs common mode voltage input bias current vs common mode voltage input bias current vs temperature v os temperature coef? cient distribution typical performance characteristics input offset voltage (v) C60 C40 number of units 60 80 100 120 60 6244 g01 40 20 50 70 90 110 30 10 0 C20 0 20 40 ltc6244ms8 v s = 5v, 0v v cm = 2.5v t a = 25c input offset voltage (v) 0 number of units 20 40 6010 30 50 6244 g02 C350 C200 C50 100 250 400 C500 ltc6244dd v s = 5v, 0v v cm = 2.5v t a = 25c distribution (v/c) C2.4 C1.6 C0.8 0 0.8 1.6 2.4 number of units 6 12 13 14 6422 g03 43 2 1 10 8 5 11 0 9 7 ltc6244ms8 v s = 5v, 0v v cm = 2.5v 2 lotsC55c to 125c distribution (v/c) C6 6 C5 5 C4 4 C3 3 C2 2 C1 10 number of units 6 6422 g04 43 2 1 10 8 5 11 0 9 7 ltc6244dd v s = 5v, 0v v cm = 2.5v 2 lotsC55c to 125c total supply voltage (v) 0 supply current (ma) 3 4 5 6 10 6244 g05 2 1 0 24 8 6 7 8 12 t a = 125c t a = 25c t a = C55c input common mode voltage (v) C1 offset voltage (v) 0 200 500400 3 6244 g06 C200 C100 100 300 C300C400 0 1 2 4 C0.5 3.5 0.5 1.5 2.5 4.5 5 t a = 125c t a = 25c t a = C55c v s = 5v, 0v normalized to25c v os value common mode voltage (v) 0 0.5 1 10 input bias current (pa) 100 1.5 2 2.5 3 3.5 4 4.5 5 6244 g07 1 0.1 1000 10000 t a = 125c t a = 85c t a = 25c ms8 package v s = 5v, 0v common mode voltage (v) C0.8 input bias current (pa) 200 400 600 800 0 6244 g08 0 C200 100 300 500 700 C100 C300 C400 C0.6 C0.4 C0.2 0.2 0.4 0.6 0.8 1.0 t a = 125c t a = 25c ms8 package v s = 5v, 0v t a = 85c temperature (c) 25 35 45 10 input bias current (pa) 100 1000 55 65 75 85 95 105 115 125 6244 g09 1 0.1 10000 ms8 package v cm = v s /2 v s = 10v v s = 5v downloaded from: http:///
ltc6244 11 6244fb output saturation voltage vs load current (output high) gain bandwidth and phase margin vs temperature open loop gain vs frequency gain bandwidth and phase margin vs supply voltage slew rate vs temperature output impedance vs frequency common mode rejection ratio vs frequency channel separation vs frequency output saturation voltage vs load current (output low) typical performance characteristics load current (ma) 0.1 0.01 output low saturation voltage (v) 0.1 1 10 1 10 100 6244 g10 t a = 125c t a = 25c t a = C55c v s = 5v, 0v load current (ma) 0.1 0.01 output high saturation voltage (v) 0.1 1 10 1 10 100 6244 g11 t a = 125c t a = 25c t a = C55c v s = 5v, 0v temperature (c) C55 C35 C15 30 gain bandwidth (mhz) phase margin (deg) 40 60 70 65 85 105 6244 g12 50 0C20 20 60 8040 5 25 45 125 v s = 5v phase margin gain bandwidth v s = 5v v s = 1.5v v s = 1.5v c l = 5pf r l = 1k frequency (hz) 0 gain (db) phase (deg) 20 30 40 60 80 10k 1m 10m 100m 6244 g13 C20 100k 100C10 10 50 70 90 C80 C40 C20 0 40 80 C120 120C100 C60 20 60 100 v s = 5v v s = 1.5v c l = 5pf r l = 1k v cm = v s /2 phase gain total supply voltage (v) 0 40 gain bandwidth (mhz) phase margin (deg) 50 60 70 30 40 50 60 2 468 6244 g14 10 12 t a = 25c c l = 5pf r l = 1k gain bandwidth phase margin temperature (c) C50 slew rate (v/s) 34 46 48 50 0 50 75 6244 g15 30 42 38 32 4428 40 36 C25 25 100 125 v s = 5v v s = 2.5v a v = C2 r f = 1k, r g = 500 conditions: see note 11 falling rising frequency (hz) 0.1 output impedance () 10 100 0.01 1 10k 1m 10m 100m 6244 g16 0.001 100k 1000 a v = 10 a v = 1 a v = 2 t a = 25c v s = 2.5v frequency (hz) 10 common mode rejection ratio (db) 30 50 70 90 10k 1m 10m 100m 6244 g17 C10 100k 110 0 20 40 60 80 100 t a = 25c v s = 2.5v frequency (hz) C100 channel separation (db) C80 C60 C40 C20 10k 1m 10m 100m 6244 g18 C120 100 0 C110 C90 C70 C50 C30 C10 t a = 25c v s = 2.5v a v = 1 downloaded from: http:///
ltc6244 12 6244fb minimum supply voltage output short-circuit current vs power supply voltage open-loop gain open-loop gain open-loop gain power supply rejection ratio vs frequency offset voltage vs output current warm-up drift vs time noise voltage vs frequency typical performance characteristics frequency (hz) 1k 40 power supply rejection ratio (db) 50 60 70 80 10k 1m 100k 10m 100m 6244 g19 30 2010 0 C10 90 100 t a = 25c v s = 2.5v negative supply positive supply total supply voltage (v) 0 change in offset voltage (v) 0 100 200 300 8 6244 g20 C100C200 C50 50 150 250 C150C250 C300 2 4 6 19 3 5 7 10 t a = 125c t a = 25c t a = C55c v cm = v s /2 power supply voltage (v) 1.5 C50 output short-circuit current (ma) C40 C20 C10 0 5020 2.5 3.5 4 6244 g21 C30 30 4010 2 3 4.5 5 t a = 125c t a = 25c t a = C55c sourcing sinking output voltage (v) C5 C110 input voltage (v) C100 C80 C70 C60 C40 C4 0 2 6244 g22 C90 C50 C1 4 5 C3 C2 13 t a = 25c v s = 5v r l = 10k r l = 1k output voltage (v) 0 C110 input voltage (v) C100 C80 C70 C60 C40 0.5 2.5 3.5 6244 g23 C90 C50 2 4.5 5 1 1.5 34 t a = 25c v s = 5v, 0v r l = 10k r l = 1k output voltage (v) 0 C40C50 C60 C70 C80 C90 C100C110 1.5 2.5 6244 g24 0.5 1 23 input voltage (v) t a = 25c v s = 3v, 0v r l = 100k r l = 10k output current (ma) C50 offset voltage (v) 200150 100 50 0 C50 C100C150 C 200 30 6244 g25 C30 C10 10 50 20 C40 C20 0 40 v s = 5v t a = 125c t a = 25c t a = C55c time after power up (sec) 0 change in offset voltage (v) C20 C15 C10 60 6244 g26 C30C45 10 20 30 40 50 5 15 25 35 45 55 C5 C25C35 C40 t a = 25c v s = 1.5v v s = 2.5v v s = 5v frequency (hz) 10 noise voltage (nv/ hz ) 20 25 35 40 10 1k 10k 100k 6244 g27 0 100 3015 5 t a = 25c v s = 2.5v v cm = 0v downloaded from: http:///
ltc6244 13 6244fb series output resistance and overshoot vs capacitive load series output resistance and overshoot vs capacitive load settling time vs output step (noninverting) 0.1hz to 10hz voltage noise noise current vs frequency settling time vs output step (inverting) distortion vs frequency maximum undistorted output signal vs frequency series output resistance and overshoot vs capacitive load typical performance characteristics time (1s/div) voltage noise (500nv/div) 6244 g28 v s = 5v, 0v frequency (hz) 100 noise current (fa/ hz ) 100 1000 1k 10k 100k 6244 g29 10 1 0.1 t a = 25c v s = 2.5v v cm = 0v capacitive load (pf) 10 0 overshoot (%) 10 20 30 40 60 100 1000 6244 g30 50 r s = 10 r s = 50 v out = 100mv v s = 2.5v a v = C2 +C r s 1k 30pf 500 c l capacitive load (pf) 10 0 overshoot (%) 10 20 30 40 60 100 1000 6244 g31 50 r s = 10 r s = 50 v out = 100mv v s = 2.5v a v = C1 +C r s 1k 30pf 1k c l capacitive load (pf) 10 0 overshoot (%) 10 20 30 40 60 100 1000 6244 g32 50 r s = 10 r s = 50 v out = 100mv v s = 2.5v a v = 1 +C r s c l output step (v) C4 settling time (ns) 500 600 700 4 6244 g33 400 300 0 C2 0 2 C3 C1 1 3 200100 900 1mv 1mv 800 v in v out 1k +C v s = 5v a v = 1 t a = 25c note: exceeds input common mode range 10mv 10mv output step (v) C4 settling time (ns) 500 600 700 4 6244 g34 400 300 0 C2 0 2 C3 C1 1 3 200100 900 1mv 1mv 800 v s = 5v a v = C1 t a = 25c 10mv 10mv v in v out 1k 1k 1k +C frequency (hz) 10k 5 output voltage swing (v p-p ) 7 10 100k 1m 10m 6244 g35 3 4 6 8 9 21 a v = C1 a v = +2 v s = 5v t a = 25c hd2, hd3 < C40dbc frequency (hz) 10k C60 distortion (dbc) C50 C40 C30 100k 1m 10m 6244 g36 C70C80 C90 C100 v s = 2.5v a v = +1 v out = 2v p-p r l = 1k, 2nd r l = 1k, 3rd downloaded from: http:///
ltc6244 14 6244fb distortion vs frequency distortion vs frequency distortion vs frequency large-signal response large-signal response output overdrive recovery small-signal response small-signal response typical performance characteristics frequency (hz) 10k C60 distortion (dbc) C50 C40 C30 100k 1m 10m 6244 g37 C70C80 C90 C100 v s = 2.5v a v = +2 v out = 2v p-p r l = 1k, 2nd r l = 1k, 3rd frequency (hz) 10k C60 distortion (dbc) C50 C40 C30 100k 1m 10m 6244 g38 C70C80 C90 C100 v s = 5v a v = +1 v out = 2v p-p r l = 1k, 2nd r l = 1k, 3rd frequency (hz) 10k C60 distortion (dbc) C50 C40 C30 100k 1m 10m 6244 g39 C70C80 C90 C100 v s = 5v a v = +2 v out = 2v p-p r l = 1k, 2nd r l = 1k, 3rd v s = 2.5v a v = 1 r l = 0v 6244 g40 200ns/div v s = 2.5v a v = 1 r l = c l = 75pf 0v 6244 g41 200ns/div v s = 5v a v = 1 r l = 0v 6244 g42 2s/div v s = 2.5v a v = C1 r l = 1k 0v 6244 g43 200ns/div v s = 2.5v a v = 3 r l = 3k 0v v in 1v/div v out 2v/div 0v 6244 g44 200ns/div downloaded from: http:///
ltc6244 15 6244fb ampli? er characteristics figure 1 is a simpli? ed schematic of the ltc6244, which has a pair of low noise input transistors m1 and m2. a simple folded cascode q1, q2 and r1, r2 allow the input stage to swing to the negative rail, while performing level shift to the differential drive generator. low offset voltage is accomplished by laser trimming the input stage. capacitor c1 reduces the unity cross frequency and im- proves the frequency stability without degrading the gain bandwidth of the ampli? er. capacitor c m sets the overall ampli? er gain bandwidth. the differential drive generator supplies signals to transistors m3 and m4 that swing the output from rail-to-rail. the photo of figure 2 shows the output response to an input overdrive with the ampli? er connected as a voltage follower. if the negative going input signal is less than a diode drop below v C , no phase inversion occurs. for input signals greater than a diode drop below v C , limit the current to 3ma with a series resistor r s to avoid phase inversion.the input common mode voltage range extends from v C to v + C 1.5v. in unity gain voltage follower applications, exceeding this range by applying a signal that reaches 1v from the positive supply rail can create a low level instability at the output. loading the ampli? er with several hundred micro-amps will reduce or eliminate the instability. esd the ltc6244 has reverse-biased esd protection diodes on all input and outputs as shown in figure 1. these diodes protect the ampli? er for esd strikes to 4kv. if these pins are forced beyond either supply, unlimited current will ? ow through these diodes. if the current transient is less than 1 second and limited to one hundred milliamps or less, no damage to the device will occur. the ampli? er input bias current is the leakage current of these esd diodes. this leakage is a function of the tem- perature and common mode voltage of the ampli? er, as shown in the typical performance chacteristics. noise the ltc6244 exhibits low 1/f noise in the 0.1hz to 10hz region. this 1.5v p-p noise allows these op amps to be used in a wide variety of high impedance low frequency applications, where zero-drift ampli? ers might be inap- propriate due to their input sampling characteristic. in the frequency region above 1khz the ltc6244 also shows good noise voltage performance. in this frequency region, noise can easily be dominated by the total source figure 1. simpli? ed schematic figure 2. unity gain follower test circuit applications information r2 6244 f01 v in + i tail v in C v o v + v + v C v C v C cm desd5 differential drive generator bias desd6 v + desd2 v + desd4 v C desd1 v C desd3 r1 q1 m2 m1 m3m4 c1 q2 +2.5v r s 0 C2.5v 6244 f02 + C 1/2 ltc6244 v in v out v out and v in of follower with large input overdrive v + 2.5v v C C2.5v downloaded from: http:///
ltc6244 16 6244fb resistance of the particular application. speci? cally, these ampli? ers exhibit the noise of a 4k resistor, meaning it is desirable to keep the source and feedback resistance at or below this value, i.e., r s + r g ||r fb 4k. above this total source impedance, the noise voltage is not dominated by the ampli? er. noise current can be estimated from the expression i n = 2qi b , where q = 1.6 ? 10 C19 coulombs. equating 4ktr f and r s 2qi b f shows that for source resistors below 50g the ampli? er noise is dominated by the source resistance. see the typical characteristics curve noise current vs frequency. proprietary design techniques are used to obtain simulta- neous low 1/f noise and low input capacitance. low input capacitance is important when the ampli? er is used with high source and feedback resistors. high frequency noise from the ampli? er tail current source, i tail in figure 1, couples through the input capacitance and appears across these large source and feedback resistors. stability the good noise performance of these op amps can be attributed to large input devices in the differential pair. above several hundred kilohertz, the input capacitance can cause ampli? er stability problems if left unchecked. when the feedback around the op amp is resistive (r f ), a pole will be created with r f , the source resistance, source capacitance (r s , c s ), and the ampli? er input capacitance. in low gain con? gurations and with r f and r s in even the kilohm range (figure 3), this pole can create excess phase shift and possibly oscillation. a small capacitor c f in parallel with r f eliminates this problem. achieving low input bias currentthe dd package is leadless and makes contact to the pcb beneath the package. solder ? ux used during the attach- ment of the part to the pcb can create leakage current paths and can degrade the input bias current performance of the part. all inputs are susceptible because the backside paddle is connected to v C internally. as the input voltage changes or if v C changes, a leakage path can be formed and alter the observed input bias current. for lowest bias current, use the ltc6244 in the ms8 package. photodiode ampli? ers photodiodes can be broken into two categories: large area photodiodes with their attendant high capacitance (30pf to 3000pf) and smaller area photodiodes with relatively low capacitance (10pf or less). for optimal signal-to-noise performance, a transimpedance ampli? er consisting of an inverting op amp and a feedback resistor is most commonly used to convert the photodiode current into voltage. in low noise ampli? er design, large area photodiode ampli? ers require more attention to reducing op amp input voltage noise, while small area photodiode ampli? ers require more attention to reducing op amp input current noise and parasitic capacitances. figure 3. compensating input capacitance applications information + C c in c s 6244 f03 r f r s output c f downloaded from: http:///
ltc6244 17 6244fb large area photodiode ampli? ers a simple large area photodiode ampli? er is shown in figure 4a. the capacitance of the photodiode is 3650pf (nominally 3000pf), and this has a signi? cant effect on the noise performance of the circuit. for example, the photodiode capacitance at 10khz equates to an impedance of 4.36k, so the op amp circuit with 1m feedback has a noise gain of ng = 1 + 1m/4.36k = 230 at that frequency. therefore, the ltc6244 input voltage noise gets to the output as ng ? 7.8nv/ hz = 1800nv/ hz , and this can clearly be seen in the circuits output noise spectrum in figure 4b. note that we have not yet accounted for the op amp current noise, or for the 130nv/ hz of the gain resistor, but these are obviously trivial compared to the op amp voltage noise and the noise gain. for reference, the dc output offset of this circuit is about 100v, bandwidth is 52khz, and the total noise was measured at 1.7mv rms on a 100khz measurement bandwidth. an improvement to this circuit is shown in figure 5a, where the large diode capacitance is bootstrapped by a 1nv/ hz jfet. this depletion jfet has a v gs of about C0.5v, so that r bias forces it to operate at just over 1ma of drain current. connected as shown, the photodiode has a reverse bias of one v gs , so its capacitance will be slightly lower than in the previous case (measured 2640pf), but the most drastic effects are due to the bootstrapping. figure 5b shows the output noise of the new circuit. noise at 10khz is now 220nv/ hz , and the 130nv/ hz noise thermal noise ? oor of the 1m feedback resistor is discernible at low frequencies. what has happened is that the 7.8nv/ hz of the op amp has been effectively replaced by the 1nv/ hz of the jfet. this is because the 1m feedback resistor is no longer looking back into the large photodiode capacitance. it is instead looking back into a jfet gate capacitance, an op amp input capacitance, and some parasitics, approximately 10pf total. the large photodiode capacitance is across the gate-source volt- age of the low noise jfet. doing a sample calculation at 10khz as before, the photodiode capacitance looks like 6k, so the 1nv/ hz of the jfet creates a current noise of 1nv/6k = 167fa/ hz . this current noise necessarily ? ows through the 1m feedback resistor, and so appears as 167nv/ hz at the output. adding the 130nv/ hz of the resistor (rms wise) gives a total calculated noise density of 210nv/ hz , agreeing well with the measured noise of figure 5b. another drastic improvement is in bandwidth, now over 350khz, as the bootstrap enabled a reduction of the compensating feedback capacitance. note that the bootstrap does not affect the dc accuracy of the ampli? er, except by adding a few picoamps of gate current. there is one drawback to this circuit. most photodiode circuits require the ability to set the amount of applied reverse bias, whether its 0v, 5v, or 200v. this circuit has a ? xed reverse bias of about 0.5v, dictated by the jfet. figure 4b. output noise spectral density of the circuit of figure 4a. at 10khz, the 1800nv/ hz output noise is due almost entirely to the 7.8nv voltage noise of the ltc6244 and the high noise gain of the 1m feedback resistor looking into the high photodiode capacitance figure 4a. large area photodiode transimpedance ampli? er applications information 5v v out = 1m ? i pd bw = 52khznoise = 1800nv/ hz at 10khz i pd r f 1m hamamatsu large area photodiode s1227-1010bq c pd = 3000pf c f 3.9pf C5v 6244 f04a C + 1/2 ltc6244hv v out 1k 10k frequency (hz) 6244 f04b 100k output noise (800nv/ hz /div) downloaded from: http:///
ltc6244 18 6244fb figure 5b: output noise spectral density of figure 5a. the simple jfet bootstrap improves noise (and bandwidth) drastically. noise density at 10khz is now 220nv/ hz , about a 8.2x reduction. this is mostly due to the bootstrap effect of swapping the 1nv/ hz of the jfet for the 7.8nv/ hz of the op amp figure 5a. large area diode bootstrapping figure 6b: output spectrum of circuit of figure 6a, with photodiode bias at 0v. photodiode capacitance is back up, as in the original circuit of figure 4a. however, it can be reduced arbitrarily by providing reverse bias. this plot shows that bootstrapping alone reduced the 10khz noise density by a factor of 6.2, from 1800nv/ hz to 291nv/ hz figure 6a. the addition of a capacitor and resistor enable the bene? t of bootstrapping while applying arbitrary photodiode bias voltage v bb by providing reverse bias, and the photodiode can also be reversed to support either cathode or anode connections for positive or negative going outputs. the circuit on the last page of this data sheet shows fur- ther reduction in noise by paralleling four jfets to attain 152nv/ hz at 10khz, a noise of 12 times less than the basic photodiode circuit of figure 4a. the solution is as shown in the circuit of figure 6a, which uses a capacitor-resistor pair to enable the ac bene? ts of bootstrapping while allowing a different reverse dc voltage on the photodiode. the jfet is still running at the same current, but an arbitrary reverse bias may be applied to the photodiode. the output noise spectrum of the circuit with 0v of photodiode reverse bias is shown in figure 6b. photodiode capacitance is again 3650pf, as in the original circuit of figure 4a. this noise plot with 0v bias shows that bootstrapping alone was responsible for a factor of 6.2 noise reduction, from 1800nv/ hz to 291nv/ hz at 10khz, independent of photodiode capacitance. however, photodiode capacitance can now can be reduced arbitrarily applications information 5v v out = 1m ? i pd bw = 350khzoutput noise = 220nv/ hz at10khz i pd r f 1m philips bf862 jfet r bias 4.99k hamamatsu large area photodiode s1227-1010bq c pd = 3000pf c f 0.25pf C5v C5v 5v 6244 f04a C + 1/2 ltc6244hv v out 5v v out = 1m ? i pd bw = 250khzoutput noise = 291nv/ hz at 10khz 5v v bb i pd r f 1m philips bf862 jfet hamamatsu large area photodiode s1227-1010bq c pd = 3000pf c f 0.25pf C5v 6244 f06a C + 1/2 ltc6244hv C5v 4.99k 4.7f x7r 4.99k v out 1k 10k frequency (hz) 6244 f05b 100k output noise (200nv/ hz /div) 1k 10k frequency (hz) 6244 f06b 100k output noise (275nv/ hz /div) downloaded from: http:///
ltc6244 19 6244fb small area photodiode ampli? ers small area photodiodes have very low capacitance, typically under 10pf and some even below 1pf. their low capaci- tance makes them more approximate current sources to higher frequencies than large area photodiodes. one of the challenges of small area photodiode ampli? er design is to maintain low input capacitance so that voltage noise does not become an issue and current noise dominates. a simple small area photodiode ampli? er using the ltc6244 is shown in figure 7. the input capacitance of the ampli- ? er consists of c dm and one c cm (because the +input is figure 8a: using both op amps for higher bandwidth. a1 provides a gain of 3 within the loop, increasing the gain bandwidth product. this bootstraps the c dm accross a1s inputs, reducing ampli? er input capacitance. inversion is provided by a2, so that the photodiode looks into a noninverting input. pin 5 was selected because it is in the corner, removing one lead capacitance figure 7. ltc6244 in a normal tia con? guration grounded), or about 6pf total. the small photodiode has 1.8pf, so the input capacitance of the ampli? er is dominating the capacitance. the small feedback capacitor is an actual component (avx accu-f series), but it is also in parallel with the op amp lead, resistor and parasitic capacitances, so the total real feedback capacitance is probably about 0.4pf. the reason this is important is that this sets the compensation of the circuit and, with op amp gain band- width, the circuit bandwidth. the circuit as shown has a bandwidth of 350khz, with an output noise of 120v rms measured over that bandwidth. the circuit of figure 8a makes some slight improvements. operation is still transimpedance mode, with r f setting the gain to 1m. however, a noninverting input stage a1 with a gain of 3 has been inserted, followed by the usual inverting stage performed by a2. note what this achieves. the ampli? er input capacitance is bootstrapped by the feedback of r2:r1, eliminating the effect of a1s input c dm (3.5pf), and leaving only one c cm (2.1pf). the op amp at pins 5, 6 and 7 was chosen for the input ampli? er to eliminate extra pin-to-pin capacitance on the (+) input. the lead capacitance on the corner of an msop package is only about 0.15pf. by using this noninverting con? gura- tion, input capacitance is minimized. applications information 5v v out = 1m ? i pd bw = 350khznoise = 120v rms measured on a 350khz bw i pd r f 1m small area photodiode vishay temd1000 c pd = 1.8pf c f 0.1pf C5v C5v 6244 f07 C + 1/2 ltc6244hv v out 5v C5v i pd r f 1m r3 1k r2 1k r4 6.98k r1499 small area photodiode vishay temd1000 c pd = 1.8pf 0.07pf (parasitic) c2 150pf c1 56pf C5v 6244 f08a C + a1 1/2 ltc6244hv v out 8 4 1 7 56 C + a2 1/2 ltc6244hv 23 v out = 1m ? i pd bw = 1.6mhznoise = 1.2mv rms measured on a 2mhz bw downloaded from: http:///
ltc6244 20 6244fb figure 8b: output noise spectrum of the circuit in figure 8a. noise at 1mhz is 782nv/ hz , due mostly to the input current noise rising with frequency total capacitance at the ampli? ers input is now one c cm (2.1pf) plus the photodiode capacitance c pd (1.8pf), or about 4pf accounting for parasitics. the shunt impedance at 1mhz, for example, is x c = 1/(2 fc) = 39.8k, and therefore, the noise gain at 1mhz is ng = 1+rf/x c = 26. the input voltage noise of this ampli? er is about 15nv/ hz , after accounting for the effects of r1 through r3, the noise of the second stage and the fact that voltage noise does rise with frequency. multiplying the noise gain by the input voltage noise gives an output noise density due to voltage noise of 26 ? 15nv/ hz = 390nv/ hz . but the noise spectral density plot of figure 8b shows an output noise of 782nv/ hz at 1mhz. the extra output noise is due to input current noise, multiplied by the feedback impedance. so while the circuit of figure 8a does increase bandwidth, it does not offer a noise advantage. note, however, that the 1.2mv rms of noise is now measured in a 2mhz bandwidth, instead of over a 350khz bandwidth of the previous example. a low noise fully differential buffer/ampli? er in differential signal conditioning circuits, there is often a need to monitor a differential source without loading or adding appreciable noise to the circuit. in addition, add- ing gain to low level signals over appreciable bandwidth is extremely useful. a typical application for a low noise, high impedance, differential ampli? er is in the baseband circuit of an rfid (radio frequency identi? cation) receiver. the baseband signal of a uhf rfid receiver is typically a low level differential signal at the output of a demodulator with differential output impedance in the range of 100 to 400. the bandwidth of this signal is 1mhz or less. the circuit of figure 9a uses an ltc6244 to make a low noise fully differential ampli? er. the ampli? ers gain, input impedance and C3db bandwidth can be speci? ed indepen- dently. knowing the desired gain, input impedance and C3db bandwidth, r g , c f and c in can be calculated from the equations shown in figure 9b. the common mode gain of this ampli? er is equal to one (v outcm = v incm ) and is independent of resistor matching. the component values in the figure 9a circuit implement a 970khz, gain = 5, differential ampli? er with 4k input impedance. the output differential dc offset is typically less than 500v. the differential input referred noise voltage density is shown in figure 10. the total input referred noise in a 1mhz bandwidth is 16v rms . applications information 50k 1m frequency (hz) 6244 f08b 5m output noise (150nv/ hz /div) downloaded from: http:///
ltc6244 21 6244fb a low noise ac difference ampli? er in the signal conditioning of wideband sensors and trans- ducers, a low noise ampli? er is often used to provide gain for low level ac difference signals in the frequency range of a few hertz to hundreds of kilo-hertz. in addition, the ampli? er must reject common mode ac signals and its input impedance should be higher than the differential source impedance. typical applications are piezoelectric sensors used in sonar, sound and ultrasound systems and lvdt (linear variable differential transformers) for displacement measurements in process control and robotics. the figure 11a circuit is a low noise, single supply ac difference ampli? er. the ampli? ers low frequency C3db bandwidth is set with resistor r5 and capacitor c3, while the upper C3db bandwidth is set with r2 and c1. the input common mode dc voltage can vary from ground to v + and the output dc voltage is equal to the v ref voltage. the ampli? ers gain is the ratio of resistors r2 to r1 (r4 = r2 and r3 = r1). the component values in the circuit of figure 11a implement an 800hz to 160khz ac ampli- ? er with a gain equal to 10 and 12nv/ hz input referred voltage noise density shown in figure 11b. the total input referred wideband noise is 4.5v rms , in the bandwidth of 500hz to 200khz. input impedance = 2 ? r in gain = v out + ?v out ? v in + ?v in ? = r g r in maximum gain = 5mhz f 3db c f = 1 4398 ? f 3db ?gain + 2 () c in = gain + 2 8.977 ? gain ? r in ?f 3db f 3db = 1 4000 ? 2 ?r g ?c f ?c in figure 9b. design equations for figure 9a circuit figure 10. differential input referred noise figure 9a. low noise fully differential buffer/ampli? er (f C3db = 970khz, gain = 5, r in = 4k) applications information 2k 2k v in + r g 10k r in 2k r in 2k c in 82pf c in 82pf c f 33pf c f 33pf C + 1/2 ltc6244 v out + C + 1/2 ltc6244 v out C 2k 6244 f09a v + v C 2k r g 10k v in C 3228 24 20 16 12 8 10k 100k frequency (hz) 6244 f10 1m 4 input referred noise (nv/ hz ) f C3db = 970khz gain = 5r in = 4k downloaded from: http:///
ltc6244 22 6244fb figure 11b. input referred noise figure 11a. low noise ac difference ampli? er (bandwidth 800hz to 160khz, gain = 10) v out = gain ? v2 ? v1 () + v ref gain = r2 r1 r3 = r1, r4 = r2, c1 = c2 bandwidth = f hi ?f lo f hi = 1 2? ?r2?c1 , f lo = 1 2? ?r5?c3 applications information r5 200k v + r2 20k r4 20k c247pf r3 2k v2 v1 v out v ref 6244 f11a r1 2k c1 47pf c3 1000pf C + 1/2 ltc6244 C + 1/2 ltc6244 2824 20 16 12 8 11 0 frequency (khz) 6244 f11b 1000 40 input referred noise (nv/ hz ) bw = 800hz to 160khzgain = 10 downloaded from: http:///
ltc6244 23 6244fb package description 0.25 0.05 2.38 0.05 recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 1.65 0.05 (2 sides) 2.10 0.05 0.50bsc 0.70 0.05 3.5 0.05 packageoutline 3.00 0.10 (4 sides) note:1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on top and bottom of package 0.40 0.10 bottom viewexposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.125 typ 2.38 0.10 1 4 8 5 pin 1 top mark (note 6) 0.200 ref 0.00 C 0.05 (dd8) dfn 0509 rev c 0.25 0.05 0.50 bsc dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698 rev c) downloaded from: http:///
ltc6244 24 6244fb ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) msop (ms8) 0307 rev f 0.53 0.152 (.021 .006) seating plane note:1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 ? 0.38 (.009 ? .015) typ 0.1016 0.0508 (.004 .002) 0.86 (.034) ref 0.65 (.0256) bsc 0 ? 6 typ detail ?a? detail ?a? gauge plane 12 3 4 4.90 0.152 (.193 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.038 (.0165 .0015) typ 0.65 (.0256) bsc downloaded from: http:///
ltc6244 25 6244fb information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. revision history rev date description page number b 12/09 change to figure 2 15 (revision history begins at rev b) downloaded from: http:///
ltc6244 26 6244fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2006 lt 1209 rev b printed in usa part number description comments ltc1151 15v zero-drift op amp dual high voltage operation 18v lt1792 low noise precision jfet op amp 6nv/ hz noise, 15v operation ltc2050 zero-drift op amp 2.7 volt operation, sot-23 ltc2051/ltc2052 dual/quad zero-drift op amp dual/quad version of ltc2050 in ms8/gn16 packages ltc2054/ltc2055 single/dual zero-drift op amp micropower version of the ltc2050/ltc2051 in sot-23 and dd packages ltc6087/ltc6088 dual/quad 14mhz cmos op amps rail-to-rail, low cost ltc6240/ltc6241/ ltc6242 single/dual/quad, 18mhz cmos op amps low noise, rail-to-rail typical application ultralow noise large area photodiode ampli? er photodiode ampli? er output noise spectal density related parts 5v v out = 1m ? i pd bw = 400khznoise = 150v rms measured on 100khzbandwidth 5v 5v 5v c1 j1 r54.99k c1 to c4: 4.7f x7rj1 to j4: philips bf862 jfets r1 to r4: 4.99k c2 c3 c4 i pd r f 1m r1 r2 hamamatsu large area photodiode s1227-1010bq c pd = 3000pf c f 0.25pf C5v 6244 ta02a C + 1/2 ltc6244hv v out j2 j3 r3 5v C5v C5v j4 r4 11 0 (khz) 6244 ta02b 100 output noise (200nv/ hz /div) downloaded from: http:///

▲Up To Search▲

Price & Availability of LTC6244HVHDD

	To Download LTC6244HVHDD Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .