-. analog w devices low noise-wideband chopper stabilized amplifier model 234 preliminary technical data features low drift: 0.1/.lvtc, 1pa/oc offset stability: 2jj.v per month submicrovolt noise: 0.7j.1.v p-p (0.01 to 1hz b.w.) fast response: 2.5mhz b.w., 4j.1.sec settling (0.01%) low cost module: $54 (1 to 9), 1%" x 1y:'" x 0.4" applications precision wideband amplification current and voltage summation high speed integration reference buffering controlled current source bridge amplifier general description analog devices' model 234 is a high performance chopper sta- bilized op amp which significantly improves on the noise and bandwidth performance of previous designs. available with drift of o.lj.i.v/c, the model 234 features 0.7j.1.v p-p input noise and 2.5mhz unity gain bandwidth to satisfy many de- manding requirements for a premium amplifier at less than premium prices. incorporating mosfet choppers and discrete components (vs. ic op amps) for the main and stabilizing amplifier chan- nels, this inverting design is virtually free of input chopper spikes and offers reduced modulation ripple for quieter wide- band performance. these characteristics are especially desira- ble when operating from high source impedances (above 100ksl) at wide bandwidths. to illustrate the improvements in noise and bandwidth performance, over previous analog de- vices' designs, comparative data is set forth in the following sections comparing models 232 and 233 with 234. other model 234 specifications include: gains of 107 v iv, 4j.1.sec settling time to 0.01 % (20ksl load, 10v) and three selections for voltage drift: 1j.1.v/c (234]), 0.3j.1.v/c (234k), and o.lj.i.v/c (234l). available in a compact plug-in module (1 y>" x 1 y>" x 0.4"), model 234 is competitively priced for new oem designs and is recommended as a pin compatible re- placement for upgrading the performance of most existing de- signs. the use of premium discrete components throughout assures repeatable unit-to-unit performance for best results at lower costs. applications in general, the model 234 inverting amplifier should be con- sidered where long term stability of offset voltage must be information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use; nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implica- tion or otherwise under any patent or patent rights of analog devices. maintained with time and temperature for precision designs, or wherever carefree operation of instruments and remote cir- cuits is essential. typical applications include low drift amplifi- cation of wideband microvolt signals, integration of low duty- cycle pulse trains and fast analog computing for general pur- pose designs. low input noise and stable offset voltages also make model 234 an ideal preamp for precision low frequency applications such as dvm's, 12 to 16 bit a to d converters, and for error amplifiers in servo and null detector systems. improved noise and bandwidth performance the improved performance of model 234 accrues from the use of discrete components throughout, coupled with low noise front-end circuits, all carefully packaged and shielded to mini- mize pickup and intermodulation effects. chopper'modulation ripple, as shown in figure 1, is significantly reduced over an earlier design, model 232, for most wideband applications. 250k 10k 10011 ~ 50k ... figure 1. comparative input noise (rtf) performance in a dc to 1khz bandwidth. (continued on page 3) route 1 industrial park; p.o. box 280; norwood, mass. 02062 tel: 617/329-4700 twx: 710/394-6577 obsolete
(typical @+25c and t15v unless otherwise noted) 234} 234k 234l ~specifications same as model 234j. moiels 234a bind 234b meet rated specifications of models 234j and 234k over range of -25 c to +85 c. contact factory or sales office for price and delivery. specifications subject to change without notice. -2- 160 140 "' 120 ~ z 100 ;< ~ 80 g ffi 60 :s 40 20 0 10-' open loop gain and phase shift -20 -40 u -60 '-- i;: -80 i u) -100 ~ if 120 "- -140 ffi -160 ~ 10' 10' frequency ihd 10' 10kil "a" ~ figure 2. settling time test cir- cuit using scope comparator preamp at uau. ) outline dimensions (in inches) r '1l; cmin 1.50 1 ;j -j !-0.o40 dia. 0.25 max. +vs ~*~ i -v i s - j 0.10 grid pin view notes: *optional trim pot analog devices model 79pr50k [$3.00 ea. (1-9)] connect trim terminal to common if trim pot is not used. 1. sg tied to common. 2. mating socket ac 1010@$3.oo. 3. weight: 27 grams. ~ --- in 10kil t20j.!v t20j.!v 4 to.3j.!vlc to.1j.!vlc s-10v * * 0 * * * * specifications model open loop gain dc ,2k ohm load 107 v/v min * * rated output voltage t10v min * * current t5ma min * * load capacitance range 0-1000pf min * * frequency unity gain, small signal 2.5mhz * * full power response 500khz min * * slew rate 30v /j.!sec * * settling time to 0.01 % 20kn load, 10v step (figure 2) 4j.!sec * * input offset voltage initial offset, max t50j.!v vs. temp, doc to +70oc, max t1.oj.!vlc vs. supply voltage to.2j.!v/% vs. time t2j.!v /month vs. turn on, 10 sec to 10 min t3j.!v input bias current initial, max t100pa * * ys. temp, doc to +70c, max :t4palc t2palc tlpalc ys. supply voltage to.5pa/% * * input impedance inverting input to signal ground 300k ohms * * input noise voltage, 0.01 to 1hz 0.7j.!v p-p * * 0.1 to 10hz 1.5j.!v p-p * * 10hz to 10khz 2j.!v rms * * current, 0.01 to 1hz 2 pa p-p * * 0.1 to 10hz 4pa p-p * * input voltage range (-) input to signal ground t15v max * * power supply (vdc) rated performance t15v @ sma * * operating t(12 to 18)v * * temperature range rated specificationsl doc to +70c * * operating -25c to +85c * * storage -25c to +1o0c * * price (1-9) $54. $65. $89. (10-24) $49. $59. $82. i --.. , " /' '" - phase shift / " ,\ v gain j \ ) i i i +vs in () c",'y' i vs s out+ 1m 0.35 f----0.8 ----- f- obsolete
applying the chopper stabilized amplifier (continued from page 1) shown below are plots of typical input voltage and input current noise over the frequency range of o.oihz to 10hz. particular care has been exercised in the design of this amplifier to reduce the noise level to that commensurate with the low drift performance obtained by chopper stabilization. figure 3. model 234 voltage and current noise input impedance considerations the maximum input impedance for inverting amplifiers of all types is limited by bias current, bias current drift, and noise current. these currents flowing through the source impedance will increase the total error and noise when the input imped- ance exceeds ell, where e is a given type of voltage error and i is the corresponding current error. figure 4 is a plot of total offset voltage, total voltage drift and total noise vs. input re- sistance for the model 234. up to 100,000 ohms, the model 234 provides relatively constant levels of offset, noise, and drift. above this resistance level, the bias current effects be- come more predominant. 100 8 4 6 8107 r in (ohms i figure 4. uncompensated offset, drift and noise vs. r in initial offset adjustment a valuable characteristic of the model 234 is the low offset voltage without external trim. the specification is 50f.1v maxi- mum for the model 234j, and 20f.1v maximum for the models 234k and 234l. in many applications there will be no need to zero the offset since it is so low. in such cases the trim ter- minal may either be left open, or grounded, whichever is more convenient for the user. if voltage offset adjustment is desired, it may be done with a potentiometer or selected fixed resistor network, as shown in the outline drawing on page 2. input bias current flowing through the input resistor(s) creates additional voltage offset, particularly with input resistances ex- ceeding 500,000 ohms. for circuits where the total input and source resistance remain relatively constant, the entire offset may be zeroed out with the voltage offset adjustment~ no additional drift will occur with the model 234 when voltage trimming is used to compensate for the offset effects of input bias current. the circuit of figure 5 should be used to compensate for bias current offsets when using the model 234 as a current to voltage converter. the potentiometer-resistor network pro- vides a compensating bias current to cancel the amplifier's own input bias current. the offset voltage trim may be used but is not necessary when using this technique. when the amplifier is used with a widely varying input resist- ance and minimum offset is desired, the voltage and current trim potentiometers should be used. the voltage offset should be zeroed with a low value (e.g. lk ohm) resistor connected from the inverting input to ground. the offset current adjust- ment should be made with the maximum expected value of ri connected between the input and ground. lin ~ ri rf ~ .., i -in 234 --0 ein 10mn eout = -(rf/rj) ein voltage offset adjust -vs (50ku pot) 10mn current offset adjust 1kn (50ku pot) figure 5. offset current voltage cancellation inverting operation the model 234 is designed for use in the inverting mode. it is important that the sg (equivalent to +in) terminal be kept at the same potential as the amplifier's "common" terminal. any voltage difference between these points is similar to a common mode voltage, and performance cannot be guaranteed under such conditions. the model 234 is also an excellent amplifier for measurement and conversion of low level current sources to proportionate voltages. with offset current externally zeroed, input currents of ten to twenty picoamperes can be amplified and converted to a voltage source for further processing. shielding, pickup and grounds a special feature of the model 234 is the internal electro- static shield. this prevents not only pickup of extraneous signals by the module but also prevents radiation of chopper noise by the module. one precaution is to insure that noise sources are shielded from the inverting input. the user should -3- obsolete
also insure that ground loops do not occur which can add ex- traneous signals when amplifying from microvolt or millivolt sources. figure 6 illustrates the proper connections to avoid ground loops. rf r'l power supply common * signal return and load return should be connected to power common as close to amplifier pins as possible figure 6. ground connection intermodula non considera nons if noise at medium frequencies (to 400hz) finds its way into the input circuits of carrier amplifiers (chopper amplifiers and the chopper-stabilizing portions of chopper-stabilized ampli- fiers), it tends to "beat" with the chopper frequency and pro- duce sum and difference frequencies. the "sum" frequencies are unimportant, because they are usually filtered out; the noise frequency is usually unimportant because it, too, is filtered out. but the difference frequencies (which can include dc) usually interfere directly with the low-level low-frequency signal information. there are precautions that can be taken by the manufacturer to minimize such interference occurring within the devices themselves; but the user must also be aware of the need for precautions, especially in performing low-level measurements in the presence of: 1. input signals containing high-frequency normal-mode noise components (such as unfiltered carrier from a measuring device) 2. ripple coupled in from power supplies 3. stray electromagnetic radiation at line frequencies, especially if it is rich in harmonics. this noise may be introduced to the amplifier at either impro- perly guarded input leads or at the power supply terminals. these effects may be minimized by using shielded supplies which have low ripple and low source impedances at the line harmonics. properly shielding the input leads, as well as locating the amplifier as far from sources of 60hz (or 50hz) magnetic fields, is also recommended for best performance. mechanical orientation of the amplifier package and layout of signal grounds may also be used to minimize emi effects. if a "beat" does occur, it usually manifests itself as a slowly varying offset signal at the output of the amplifier, usually below 20hz. to examine the extent of this equivalent offset noise voltage in a system, an oscilloscope should be used to monitor the amplifier output with the input signal point shorted to ground. as another test, a low level signal may be applied at the input of the final circuit configuration to deter- mine the intermodulation rejection capability of the design. in this test, the signal frequency should be swept through the modulation frequency point to observe output signal peaking. a low pass output filter, at approximately 40hz, should be used when making these tests. the "t"network high gains and high input impedance to an inverting amplifier normally require excessively large feedback resistors. for ex- ample, an input impedance of 1,000,000 ohms and a gain of 100 require a feedback resistor of 100 megohms. such a re- sistor is relatively expensive, particularly for low tolerance units. furthermore, one picofarad of stray capacitance across this single resistor would reduce 3db bandwidth to 1590hz, and resistive leakage across pc boards may become a problem. the "t" network in figure 7 is a means of minimizing these problems. if the ratio rf/ri is at least 5 to 1, there will be no measurable change in other performance characteristics. if the ratio is lower, for instance, 1 to 1, the effective drift and noise gain will be doubled, compared to the signal gain. a general rule is to make the ratio rf/ri approximately equal to the ratio r2 /r1. this normally results in reasonable values of resistance for rf, and a minimal increase in noise and drift gains compared to the standard two resistor circuit. an addi- tional advantage of the "t" network is variable gain without the necessity of connecting a switch or potentiometer directly to the highly sensitive inverting input terminal. this avoids serious noise pickup problems. in such a hookup, r1 is the variable element. n ..... cd c! ... i n m ... u ai a2 a, ein ai e _. [ ai+(aii1a2, ] ra2+(a1i1aiil e. 0 aj lall1aijon eo 'i ai? a, figure 1. "t" network overload recovery the overload recovery circuit shown in figure 8 will prevent the input circuitry from becoming saturated. this circuit, con- nected externally, will allow the amplifier to recover from overload in less than 0.5/lsec. without this circuit overload re- covery will require up to 5 seconds. ,. r'n "n~/1 use if overload currents ~-, 6"u~~~~sgud:r~~~~~~';::"lity ' z 0 w i- z a: c.. high source impedance circuits when required to operate from source impedances above 100ks1, the model 234, with inherently lower input current noise and spikes, offers dramatic improvements over previous designs. (see figure 9) jookn 3mn 1okn 5pv rti { figure 9. comparative input noise (rtj) performance in a dc to 10hz bandwidth. -4- -- obsolete
...... ii>' low vol t ag ~ rift -chopper stabilized models 234, 233, 60, 261, 231, 210 -"'- --- ...' ~,-,~ general description chopper stabilized amplifiers employ modulation techniques for processing the "low frequency" components of a signal and an ac coupled amplifier for the higher frequencies. this chopping technique makes it possible to process wide- band signals and yet achieve superior low drift and long term stability. analog devices, a pioneer in the development of encapsulated chopper stabilized amplifiers, offers designs with drifts between 0.1 to iilv/c, low frequency voltage noise to 1 ~v pop and bias currents from 50 to 300pa. long term stability averages iilv imonth. these amplifiers are widely accepted as the best choice when it is essential to maintain either low voltage offsets and bias currents versus time or against severe environmental changes, or whenever external offset adjustments are not possible or desirable. model 234 jikil: lowest noise, wideband this latest inverting amplifier design from analog devices is virtually free of chopper spikes and is singled out as the industry's quietest, wide band chopper stabilized amplifier in a low cost module. to illustrate the significant improvement in per- formance, comparative noise signals are presented in the figure for model 234 and its predecessor model 232. available in three drift selections (i, 0.3 and o.iilv / c), model 234 specifications include voltage noise of 1 ~v pop, current noise of 2pa pop, and 2.5mhz bandwidth. slew rate is 30vlllsec. the wide bandwidth of 234 makes it especially useful for 16-bit di a converters, high speed integrators as well as for low frequency applications includ- ing control systems, dvm input amplifier designs and other precision instrumentation. attractively priced, its consistent unit-to-unit performance makes it an ideal choice for new oem designs. model 233 jikil: wwest cost, o.iilv/c the popular model 23 3 is a good choice for many low drift, high gain applications including precision integrators, instrument preamplifiers and null detectors as used to resolve microvolt error signals. the combination of ic's and improved design techniques in this 0.4" high module results in good performance at low cost for oem designs. typical specifications for this inverting amplifier include 500khz bandwidth, 0.25v/j.lsec slew rate, 5opa bias current and 31lv pop noise in a 10hz bandwidth. it is available with three drift selections: 1; 0.3; and o.iilv/oc. model 260 jik: 10911 non inverting, o.lilv/c analog devices pioneered in the development of new "chopper" amplifier designs to provide high input impedance without compromising the excellent low frequency character- istics of chopper type amplifiers. as embodied in the model 260, this design is useful as a non inverting buffer amplifier for processing microvolt signals with minimal source loading errors. typical specifications for the model 260 are 10911 input impedance, drift to o.iilv/cand cmrof 1l0db at fiv. model 261: guaranteed noise of less than ipv the model 261 is a second generation design which typically provides a significant improvement in the noise and bandwidth characteristics of model 260 and other competitive models. 48 amplifiers ~~;~~<',::. \,,\~ model open loop gain dc rated load, viv min rated output, min requency response unity gain, small signal full power response, min slewing rate, min overload recovery nput offset voltage initial, 25c (adj. to zero) max avg. vs. temp (oc to 70c) max vs. supply voltage vs. time nput islas \,;urrent initial, 25c, max avg. vs. temp (ooc to 70c) max input impedance differential common mode input noise voltage, 0.01 to 1hz, p-p 0.ltol0hz,p-p tohz to 10khz, rms current, 0.01 to 1hz, p-p 0.1 to 10hz, p-p nput voltage range common mode voltage, min common mode rejection max safe differential voltage 'ower supply range (vdc) rated specification (vdc) emperature range operating, rated specifications 'ackage uutllne case dimensions rice 1-9 10-24 cr ~ 4"ila log devices 111100( !, 'l a i cf/qpptr tl'f l st48ilij:(d """"'pl/fi(r 0 to +70c 1.5" x 1.5" x 0.4" $45 $40 $54 $49 $75 $68 t ',~ ode i 260 inverting input bias current :!:3na, max. lowest cost general purpose 233 j k l to7 :!:10v@sma sookhz 4khz 0.2svij.l.s - tsoj.l.v i t20j.l.v i t20j.l.v t1.0 :!:0.3 to.1j.1.v/c to.2j.1.v/% :!:2j.1.v/mo. i tsopa i:!:o.spa/c t2 tl 600kil na - ij.1.v 3j.1.v 3j.1.v 3pa 6pa obsolete
operating at a higher carrier frequency. this non inverting de- sign features extremely low noise. 0.4pvp-p in a 1hz band- width; low drift, o.lpv/c; and an output that is virtually free of chopper spikes. model 261 also offers a solution to beat frequency problems caused by a low frequency carrier mixing with harmonics of the ac line. the carrier frequency on this design is nearly a decade higher than that of models previously available, thereby eliminating the possibility of any interaction with the line frequency or its harmonics. the new model should be considered for all new instruments and circuit applications, or wherever improved performance. at no increase in cost, is desirable for existing sockets. models 260 and 261 are mechanically and electrically interchangeable for these applications. model 261 will be available in production quantities by june of 1973. evaluation units are available from stock. model 231 j/k: 2sma output. o.lpv/c model 231, available in two drift selections (231j, 0.2spv/c and 231k, 0.1 pv /c) is an inverting chopper stabilized amplifier with increased output current capability (2sma). with stable 3khz full power response and low drift. it offers higher output without use of an additional booster stage for heavier load requirements. models 210/211: 100vpsec wideband, ipv/c models 210/211 with 20ma output, are inverting chopper stabilized amplifiers for that class of application requiring low drift performance with good high frequency performance. this design will provide slew rates of 100v/psec and 90db of loop gain at 10khz for improved wideband accuracy. incorporating intemallimiting circuitry. these amplifiers have exceptionally fast overload recovery, (0.2psec) and stable input characteristics for high speed integrator and comparator designs. they are available in two drift selections (model 210, ipv / c, model 211, 2pv l c). i . r-- i dc to 1khz noise, referred to the input; 234 vs 232. ., amplifiers 49 - - - - - - -- ----- high performance low cost \yjdebmd n on-lnvcrong gencni purpose high bandwidth ipv p-p lowest noise high zin 25ma output 20ma output 234 260 231 210/211 1 k l 1 k 1 k 210 211 107 s x 106 107 108 :!:lov@sma tl0v@sma tl0v@zsma tl0v@zoma z.smhz 100hz sookhz zomhz sookhz z to sohz 3khz sookhz 30v/ps 100v/s o.zv/ps l00v/ps - 3 oms 3.0sec 0.2ps tsov i tzsv i tzspv tzsilv tlspv i tloilv tl00pv t1.0 to.3 to.lilv/.c to. 3 i to.lpvt"c to.zs to.1pv/.c to.s i tl1lv/.c to.2v/% to. 1 ilv/% to.1pv/% :!:lollv/% tzv/mo. t1.0pv/mo. tl.0pv/mo. t1.0llv/day i tl00pa i t2pa/.c t300pal tl00pa i tsopa tl00pa i tls0pa t4 t2 tiopat"c t1.0 to.spat"c tl t3pat"c 300kg sokg//o.olpf 300kg sookg na 10' giio.ozpf na na 0.7jj.v o.4pv 1.silv spy i iopv 1.sv 1.0pv 10v - 2v - sv 10v zpa 4pa iopa 10pa 4pa iopa 3spa - na t1.0v na na na 1l0db na na t1sv tzov tlsv tlsv t(lz to is)v t(10 to is)v t(lz to is)v t(lz to ls)v tlsv@sma tlsv@6ma tlsv@+s, -10ma t1sv@+30, -4ma 0 to +70.c 0 to +70.c 0 to +70.c 0 to +70.c f--3 fa--6 wa- 1 r 7 i.s" x 1.s" x 0.4" i.s" x i.s" x 0.6z" 3.6" x 1.6" x 0.4" z.s7" x 1.37" x 0.99" $54 i $65 i $89 $49 i $64 s8o i slis $157 i sib $49 $s9 $sz $4s $ss $74 $10s $148 $107 obsolete
..., l1li'" low voltage drift -chopper 5t ablllzed models 234, 233, 260, 261, 231, 210 - =- --- '> -- ~---=- general description chopper stabilized amplifiers employ modulation techniques for processing the "low frequency" components of a signal and an ac coupled amplifier for the higher frequencies. this chopping technique makes it possible to process wide- band signals and yet achieve superior low drift and long term stability. analog devices, a pioneer in the development of encapsulated chopper stabilized amplifiers, offers designs with drifts between 0.1 to lilv / c, low frequency voltage noise to 1 ~v p-p and bias currents from 50 to 300pa. long term stability averages iilv /month. these amplifiers are widely accepted as the best choice when it is essential to maintain either low voltage offsets and bias currents versus time or against severe environmental changes, or whenever external offset adjustments are not possible or desirable. model 234 j/k/l: lowest noise, wideband this latest inverting amplifier design from analog devices is virtually free of chopper spikes and is singled out as the industry's quietest, wide band chopper stabilized amplifier in a low cost module. to illustrate the significant improvement in per- formance, comparative noise signals are presented in the figure for model 234 and its predecessor model 232. available in three drift selections (1, 0.3 and o.iilv / c), model 234 specifications include voltage noise of 1 ~v p-p, current noise of 2pa p-p, and 2.5mhz bandwidth. slew rate is 30v/llsec. the wide bandwidth of 234 makes it especially useful for 16-bit d/ a converters, high speed integrators as well as for low frequency applications includ- ing control systems, dvm input amplifier designs and other precision insttumentation. attractively priced, its consistent unit-to-unit performance makes it an ideal choice for new oem designs. model 233 jik/l: lowest cost, o.iilvtc the popular model 23 3 is a good choice for many low drift, high gain applications including precision integrators, instrument preamplifiers and null detectors as used to resolve microvolt error signals.. the combination of ic's and improved design techniques in this 0.4" high module results in good performance at low cost for oem designs. typical specifications for this inverting amplifier include 500khz bandwidth, 0.25v /j.l5ec slew rate, 50pa bias current and 31lv p-p noise in a 10hz bandwidth. it is available with three drift selections: 1; 0.3; and o.iilvtc. model 260 jik: 109il noninverting, o.iilvtc analog devices pioneered in the development of new "chopper" amplifier designs to provide high input impedance without compromising the excellent low frequency character- istics of chopper type amplifiers. as embodied in the model 260, this design is useful as a noninverting buffer amplifier for processing microvolt signals with minimal source loading errors. typical specifications for the model 260 are 109 il input impedance, driftto o.iilvtcand cmr of hodb at :tl v. model 261: guaranteed noise of less than iilv the model 261 is a second generation design which typically provides a significant improvement in the noise and bandwidth characteristics of model 260 and other competitive models. 48 amplifiers -- -- ~-:~~~;~ 't,\~ ...".,v< ' model open loop gain dc rated load, v/v min rated output. min frequency response uniry gain, small signal full power response, min slewing rate, min overload recovery input offset voltage initial, 25c (adj. to zero) max avg. vs. temp (oc to 70c) max vs. supply voltage vs. time nput is..s lurrent initial, 25c, max avg. vs. temp (ooc to 70c) max nput impedance differential common mode input noise voltage, 0.01 to 1hz, p'p 0.1 to 10hz, pop 10hz to 10khz, rms current, 0.01 to 1hz, pop 0.1 to 10hz, pop nput voltage range common mode voltage, min common mode rejection max safe differential voltage 'ower supply range (vdc) rated specification (vdc) emperature range operating, rated specifications ackage uutllne case dimensions nce 1-9 10-24 a -41\t4log dv/cs modi.. !,!j if i cf/oppfr ""ii s748/(/ r operating at a higher carrier frequency, this non inverting de- sign features extremely low noise, 0.4j.lvp-p in a 1hz band- width; low drift, o.lj.lv/c; and an output that is virtually free of chopper spikes. model 261 also offers a solution to beat frequency problems caused by a low frequency carrier mixing with harmonics of the ac line. the carrier frequency on this design is nearly a decade higher than that of models previously available, thereby eliminating the possibility of any interaction with the line frequency or its harmonics. the new model should be considered for all new instruments and circuit applications, or wherever improved performance, at no increase in cost, is desirable for existing sockets. models 260 and 261 are mechanically and electrically interchangeable for these applications. model 261 will be available in production quantities by june of 1973. evaluation units are available from stock. model 231 j/k: 25ma output, o.lilv/c model 231, available in two drift selections (231j, 0.251lv / c and 231k, o.lilv/c) is an inverting chopper stabilized amplifier with increased output current capability (25ma). with stable 3khz fun power response and low drift, it offers higher output without use of an additional booster stage for heavier load requirements. models 210/211: 100vilsec wideband, 11lvtc models 210/211 with 20ma output, are inverting chopper stabilized amplifiers for that class of application requiring low drift performance with good high frequency performance. this design will provide slew rates of 1 oov /ilsec and 90db of loop gain at 10khz for improved wideband accuracy. incorporating internal limiting circuitry, these amplifiers have exceptionally fast overload recovery, (0.2ilsec) and stable input characteristics for high speed integrator and comparator designs. they are available in two drift selections (model 210, 1ilv/c, model 211, 2ilv/c). mode l 234 dc to 1 khz noise, referred to the input; 234 vs 232. ---- amplifiers 49 -- - high performance low cost wideband non-inverting general purpose high bandwidth ij.lv pop lowest noise high zin 2sma output 20ma output 234 260 231 210/211 j k l j k j k 210 211 107 s x 106 107 108 :!:iov@srna :!:10v@sma :!:10v@2sma :!:10v@20ma 2.smhz 100hz sookhz 20mhz sookhz 2 to sohz 3khz sookhz 30v i j.ls 1o0v/s 0.2vij.ls 1o0vij.ls - 3 oms 3.0sec 0.2j.ls :!:soj.lv i :!:2sj.lv i :!:2sj.lv :!:2sj.lv :!:lsj.lv i :!:10j.lv :!:100j.lv :!:1.0 :!:0.3 :!:o.lj.lv/c :!:0.3 i :!:o.lj.lv/c :!:0.2s :!:o. 1 j.lv/c :!:o.s i :!:lj.lv/c :!:0.2j.lv/% :!:o. 1 j.lv/% :!:o.lj.lv/% :!:loj.lv/% :!:2j.lv/mo. :!:1.0j.lv/mo. :!:1.0j.lv/mo. :!:1.0j.lv/day i :!:1o0pa i :!:2pa/.c :!:30opa1 :!:10opa i :!:sopa :!:1o0pa i :!:ls0pa :!:4 :!:2 :!:10pa/c :!:1.0 :!:o.spal.c :!:1 :!:3pa/.c 300kil 80kilii0.01j.lf 300kil sookil na 109 ili/0.02j.lf na na 0.7jj.v o.4j.lv l.5j.lv sj.lv i lj.lv 1.5j.lv 1.0j.lv ioj.lv - 2j.lv - sj.lv lj.lv 2pa 4pa iopa iopa 4pa 10pa 3spa - na :!:1.0v na na na 1l0db na na :!:lsv :!:20v :!:lsv :!:lsv :!:(l2 ro 18)v :!:(l0 to 18)v :!:(l2 ro 18)v :!:(l2 to 18)v :!:lsv@sma :!:lsv@6ma :!:lsv@+8. -loma :!:lsv@+30. -4ma 0 to +70.c 0 ro +70.c 0 to +70.c 0 to +70.c f. 3 t'a--6 wa- 1 r 7 i.s" x i.s" x 0.4" i.s" x i.s" x 0.62" 3.6" x 1.6" x 0.4" 2.87" x 1.37" x 0.99" $s4 i $6s i $89 $49 i $64 $80 i $l1s $ls7 i $113 $49 $s9 $82 $4s $s8 $74 $10s $148 $107 obsolete
r package models 210, 211 2.87 -- t i j t i , r-7 ac 1002 -osignal return. - -auto. =cli,d-i ~: : - - - --. ~- -_co, - . - - .- . - --- . ~--- . - - - - --- . como' : : :-v~~ -_. - --. - - --. ---- -.. .- oeal--'" - - -- '-+vso- ~------_.----.-_.------- w, wa packages models 231, 310, 311 3.08 w-l ac 1017 :::c::jinp. ~r'et.; 4-40 nc 2 places ii -l +~ ~ m wa-l ac 1014 1112-58nc-28 thds 2 places i ' --+--'---; i i' ~: i ~' +v++~~.;:' r . '- ,'so""""'" " ~- ihi i . .611.'1-j ' ' :..l ~gl(~.i , ' :~f~ " , r~e.t..:..o s . , , - lllir\~ ' + model 425 outline 3.2 1.072 ."~ n 0 .16 1 j9 , . jj jj o g .. !.~ ""it )(, 0' 3.3 notes: 1. model 425 gain adjust pot in series with x input. 2. mating socket supplied with unit (adi part no. 60-42820). z .;;: 0.31 1 .mechanical outlines 193 obsolete
|
