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asahi kasei [ak2920] ms0953-e-01 2011/06 - 1 - ak2920 zero drift operational amplifiers feature ak2920 is the dual channel cmos operational amplifires wh ich is available to output with very low input offset voltage (+/- 1.0 v) and near zero input offset dirft. it?s operated with very small current consumptions, 800 a typ./ch (vdd:5.0v), which is available to operate full swing signals in output. ak2920 is appropriated to sensor pre amp. applications. ? low voltage, single supply operation : 2.7v - 5.5v ? very low input offset voltage : +/- 1.0 v typ. ? near zero dirft over time and temperature : +/- 2.0nv/ c typ. ? full swing outputs to 10k load ? power supply current : 800 a typ./ch (vdd: 5.0v, no load) ? gain bandwidth : 2mhz typ. ? package : tmsop8 part name channel number package AK2920T 2 tmsop8 pin location tmsop8 (AK2920T) 2:nina 4:vss 1:outa 8:vdd 5:pinb 3:pina 7:outb 6:ninb a b
asahi kasei [ak2920] ms0953-e-01 2011/06 - 2 - pin function descriptions pin number name i/o note) function 1 outa ao amplifier a output 2 nina ai amplifier a inverted input 3 pina ai amplifier a no inverted input 4 vss pwr power supply ground 5 pinb ai amplifier b no inverted input 6 ninb ai amplifier b inverted input 7 outb ao amplifier b output 8 vdd pwr positive power supply note) pwr : power supply ai : analog input ao : analog output absolute maximum ratings vss=0v ; note parameter symbol min max units supply voltage vdd -0.3 6.5 v input voltage v td -0.3 vdd + 0.3 v input current i in -10 +10 ma storage temperature range t stg -55 150 c note : all voltage with respect to ground warning : operational at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. recommended opera ting conditions parameter symbol min. typ. max. units conditions operationg temperature range t a -40 85 c supply voltage vdd 2.7 5.5 v power supply current idd1 0.8 1.5 ma/ch vdd=5.0v,no load *we asuumes no responsibility for the usage beyond the conditions in this datasheet.
asahi kasei [ak2920] ms0953-e-01 2011/06 - 3 - electrical characteristics ? dc characteristics vdd:5v, ta:-40 to 85 c, unless otherwise noted parameter min. typ. max. units conditions input voltage offset +/- 1 +/- 10 c input bias current +/- 100 pa input common mode range 0.0 ? vdd-0.2 v output voltage swing 0.03 ? vdd-0.03 v rl 10k connected to vdd/2 common mode rejection ratio 110 130 db power supply rejection ratio 110 130 db large signal voltage gain 110 130 db rl 10k connected to vdd/2 short circuit current +/- 50 ma output current +/- 25 ma ? ac characteristics vdd:5v, ta:-40 to 85 c, unless otherwise noted parameter min. typ. max. units conditions gain bandwidth 2 mhz av:1v/v slew rate 1 v/ hz f:1khz 0.1 ? 10hz 0.2
asahi kasei [ak2920] ms0953-e-01 2011/06 - 4 - typical operating characteristics ? supply current vs. temperature (vin:1/2vdd) ? supply current vs. supply voltage (vin:1/2vdd) idd-t emperature 0 500 1000 1500 2000 2500 -40-200 20406080 t emperature [c] idd [ a] 2.7v 5.0v idd-vdd (ta = 25c) 0 500 1000 1500 2000 2500 01 234 56 supply voltage [v] idd [ a]
asahi kasei [ak2920] ms0953-e-01 2011/06 - 5 - ? output voltage vs. load current ? output voltage vs. load current (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) ? closed loop gain vs. frequency ? closed loop gain vs. frequency (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) isource / isink - vol / voh 0.01 0.1 1 10 100 1000 10000 0.0001 0.001 0.01 0.1 1 10 isource / isink [ma] vol / voh [mv] source sink isouce / isink - vol / voh 0.01 0.1 1 10 100 1000 10000 0.0001 0.001 0.01 0.1 1 10 isource / isink [ma] vol / voh [mv] source sink closed loop gain -30 -20 -10 0 10 20 30 40 50 60 70 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] closed loop gain [db] av = 100, rl = 2k ? av = 10, rl = 2k ? av = 1, rl = 2k ? closed loop gain -30 -20 -10 0 10 20 30 40 50 60 70 1.e+00 1 .e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] closed loop gain [db] av = 100, rl = 2k av = 10, rl = 2k av = 1, rl = 2k
asahi kasei [ak2920] ms0953-e-01 2011/06 - 6 - ? open loop gain and phase vs. frequency ? open loop gain and phase vs. frequency (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) ? output impedance vs. frequency ? output impedance vs. frequency (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) open loop gain and phase vs. frequency -20 -10 0 10 20 30 40 50 60 70 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] open loop gain [db] -180 -140 -100 -60 -20 20 60 100 140 180 phase [degrees] gain phase open loop gain and phase vs. frequency -20 -10 0 10 20 30 40 50 60 70 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] open loop gain [db] -180 -140 -100 -60 -20 20 60 100 140 180 phase [degrees] gain phase output impedance vs. frequency 0 50 100 150 200 250 300 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] output impedance[ ] av=1 av=10 av=100 output impedance vs. frequency 0 50 100 150 200 250 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] output impedance [ ] av=1 av=10 av=100 output impedance[ ] output impedance[ ]
asahi kasei [ak2920] ms0953-e-01 2011/06 - 7 - ? large signal transient response ? large signal transient response (vdd/vss = +1.35v/- 1.35v, (vdd/vss = +2.5v/-2.5v ta = 25c, cl = 150pf) ta = 25c, cl = 150pf) ? small signal transient response ? small signal transient response (vdd/vss = +1.35v/- 1.35v, (vdd/vss = +2.5v/-2.5v ta = 25c, cl = 150pf) ta = 25c, cl = 150pf) large signal transient response -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 time (4 sec/div) output voltage (0.5v/div) large signal tansient respons -4 -3 -2 -1 0 1 2 3 4 time (4 s/div) output voltage (1v/div) small signal transient response -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 time (4 s/div) output voltage (50mv/div) small signal transinet response -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 time (4 s/div) output voltage (50mv/div)
asahi kasei [ak2920] ms0953-e-01 2011/06 - 8 - ? small signal overshoot vs. load capacitance ? small signal overshoot vs. load capacitance (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) ? positive overvoltage recovery ? negative overvoltage recovery ( vdd/vss = +2.5v/-2.5v, ta = 25 c) ( vdd/vss = +2.5v/-2.5v, ta = 25 c) small signal overshoot vs. load capacitance 0 10 20 30 40 50 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 load capacitance [pf] overshoot [%] os+ os- small signal overshoot vs. load capacitance 0 10 20 30 40 50 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 load capacitance [pf] overshoot [%] os+ os- positive overvoltage recovery vo l t a g e [ v ] av = -50 rl = 10k ch1 = 1v/div ch2 = 50mv/div time ( 10 negative overvoltage recovery time (10 sec/div) av = -50 rl = 10k ch1 = 1v/div ch2 = 50mv/div voltage [v]
asahi kasei [ak2920] ms0953-e-01 2011/06 - 9 - ? common mode rejection ratio vs. frequency ? power supply rejection ratio vs. frequency ? power supply rejection ratio vs. frequency (vdd=2.7v, ta=25 c) (vdd=5v, ta=25 c) cmrr 0 20 40 60 80 100 120 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 frequency [hz] cmrr [db] 2.7v 5.0v psrr 0 20 40 60 80 100 120 140 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency [hz] psrr [db] 2.7v_vdd 2.7v_vss psrr 0 20 40 60 80 100 120 140 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 frequency [hz] psrr [db] 5.0v_vdd 5.0v_vss
asahi kasei [ak2920] ms0953-e-01 2011/06 - 10 - ? power supply rejection ratio vs. temperature (vdd=5v ? maximum output swing vs. frequency ? maximum output swing vs. frequency (vdd=2.7v, ta=25 c, av = 1, rl = 10k ) (vdd=5v, ta=25 c, av = 1, rl = 10k ) psrr - temperature 50 60 70 80 90 100 110 120 130 -40 10 60 temperature [c] psrr [db] maximum output swing 0 0.5 1 1.5 2 2.5 3 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] maximum output swing [v] maximum output swing 0 1 2 3 4 5 6 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] maximum output swing [v]
asahi kasei [ak2920] ms0953-e-01 2011/06 - 11 - ? voltage noise density ? voltage noise density (vdd=2.7v, ta=25 c, f=0~2.5khz) (vdd=5v, ta=25 c, f=0~2.5khz) ? voltage noise density ? voltage noise density (vdd=2.7v, ta=25 c, f=0~20khz) (vdd=5v, ta=25 c, f=0~20khz) voltage noise density 0 20 40 60 80 100 120 0 5000 10000 15000 20000 frequency [hz] voltage noise density [nv/ hz] voltage noise density 0 20 40 60 80 100 120 0 5000 10000 15000 20000 frequency [hz] voltage noise density [nv/ hz] voltage noise density 0 20 40 60 80 100 120 0 500 1000 1500 2000 2500 frequency [hz] voltage noise density [nv/ hz] voltage noise density 0 20 40 60 80 100 120 0 500 1000150020002500 frequency [hz] voltage noise density [nv/ hz ]
asahi kasei [ak2920] ms0953-e-01 2011/06 - 12 - ? voltage noise density (vdd=5v, ta=25 c, f=1~10khz) ? voltage noise ? voltage noise (vdd=2.7v, ta=25 c, f=0.1~10hz) (vdd=5v, ta=25 c, f=0.1~10hz) voltage noise density 10 100 1 10 100 1000 10000 frequency [hz] voltage noise density [nv/ hz] 0.1hz to 10hz noise voltage [ v] time (1sec/div) vn = 0.31 vpp vn +0.3 +0.2 -0.2 -0.3 0.1hz to 10hz noise voltage [ v] time (1sec/div) vn = 0.18
asahi kasei [ak2920] ms0953-e-01 2011/06 - 13 - ? output short-circuit current vs. temperature ? maximum output swing vs. frequency (vdd=2.7v, ta=-40 to 85 c) (vdd=5v, ta=25 c, ta=-40 to 85 c) ? input offset voltage drift(vdd=5v, ta=25 c, ta=-40 to 85 c) input offset voltage drifft 0 5 10 15 20 25 30 -12 -8 -4 0 4 8 12 input offset voltage drift [nv/] number of amplifiers output short-circuit current -50 -40 -30 -20 -10 0 10 20 30 40 50 -40-200 20406080 temperature [c] output short-circuit current [ma] isc- isc+ output short-circuit current -100 -80 -60 -40 -20 0 20 40 60 80 100 -40-200 20406080 temperature [c] output short-circuit current [ma] isc- isc+
asahi kasei [ak2920] ms0953-e-01 2011/06 - 14 - package 1. marking 1.1 tmsop8 2. outline dimensions 2.1 tmsop8 package outline (unit:mm) 9 8 (3) (4) (5) (1) 7 6 5 1 2 3 4 y 2 0 m a (2) (1) pin number 1 indication mark (2) part number (3) date code (year) (4) date code (month) (5) lot number m 0.1 4.00.1 2.8 2.9 +0.12 -0.1 0.65 0.127 +0.1 -0.05 0.550.2 0~10 0.90.08 0.1 +0.1 -0.05 0.1 0.2 +0.05 -0.03 1
asahi kasei [ak2920] ms0953-e-01 2011/06 - 15 - important notice z these products and their specifications are subject to change without notice. when you consider any use or appli cation of these products, please make inquiries the sales office of asahi kasei microdevices corporation (akm) or auth orized distributors as to current status of the products. z descriptions of external circuits, application circuits, software and other related information contained in this document are provided only to illustrat e the operation and application examples of the semiconductor products. you are fully responsib le for the incorporation of these external circuits, application circuits, software and other related information in the design of your equipments. akm assumes no responsibility for any losses incurred by you or third parties arising from the use of these information herein. akm assumes no liability for infringement of any patent, intellectual property, or other rights in the application or use of such information contained herein. z any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of export pertaining to customs and tariffs, currency exchange , or strategic materials. z akm products are neither intended nor auth orized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by representative director of akm. as used here: note1) a critical component is one whose failure to function or perform ma y reasonably be expected to result, whether directly or indirectly, in the loss of th e safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of perfo rmance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medici ne, aerospace, nuclear energy, or othe r fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z it is the responsibility of the buyer or distributor of akm products, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification.

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