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[ak2921] rev.1.00ea 2012/4 - 1 - ak2921 zero drift operational amplifiers feature ak2921 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, 260 a typ./ch (vdd:5.0v), which is available to operate full swing signals in output. ak2921 is appropriated to sensor pre amp. applications. ? low voltage, single supply operation : 1.6v - 5.5v ? very low input offset voltage : +/- 1.0 v typ. ? near zero dirft over time and temperature : +/- 5.0nv/ c typ. ? full swing outputs to 10k load ? power supply current : 260 a typ./ch (vdd: 5.0v, no load) ? gain bandwidth : 0.8mhz typ. ? package : tmsop8 part name channel number package AK2921T 2 tmsop8 pin location tmsop8 (AK2921T) 2: nin a 4: vss 1: ou ta 8:vdd 5:pinb 3: pina 7:outb 6:ninb a b
[ak2921] rev.1.00ea 2012/4 - 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 minimum gain av 1 v/v power supply current idd1 0.26 0.6 ma./ch vdd=5.0v,no load note : when the gain is adjusted to one or less , there is a possibility that operation becomes unstable. *we asuumes no responsibility for the usage beyond the conditions in this datasheet.
[ak2921] rev.1.00ea 2012/4 - 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 +/- 20 c input bias current +/- 20 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 100 130 db power supply rejection ratio 100 120 db large signal voltage gain 110 130 db rl 10k connected to vdd/2 short circuit current +/- 85 ma output current +/- 35 ma ? ac characteristics vdd:5v, ta:-40 to 85 c, unless otherwise noted parameter min. typ. max. units conditions gain bandwidth 0.8 mhz av:1v/v slew rate 1 v/ hz f:1khz 0.1 ? 10hz 2.1
[ak2921] rev.1.00ea 2012/4 - 4 - idd - temperature 0 200 400 600 800 1000 -40 -20 0 20 40 60 80 temperature [ ] idd [ a] 1.6v 5v typical operating characteristics ? supply current vs. temperature (vin:1/2vdd) ? supply current vs. supply voltage (vin:1/2vdd) idd - vdd (ta = 25 ) 0 200 400 600 800 1000 0123456 supply voltage [v] id d [ a]
[ak2921] rev.1.00ea 2012/4 - 5 - 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 ] 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 ] isource/isink - voh/vol 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0246810 isource / is ink [ma] voh / vol [v ] source sink is ource / isink - voh / vol 0 1 2 3 4 5 020406080100 is ource / is ink [ma] voh / vol [v ] source sink ? output voltage vs. load current ? output voltage vs. load current (vdd=1.6v, ta=25 c) (vdd=5v, ta=25 c) ? closed loop gain vs. frequency ? closed loop gain vs. frequency (vdd=1.6v, ta=25 c) (vdd=5v, ta=25 c) av = 100, rl=2k av = 10, rl=2k av = 1, rl=2k av = 100, rl=2k av = 10, rl=2k av = 1, rl=2k
[ak2921] rev.1.00ea 2012/4 - 6 - output impedance vs. frequency 0 100 200 300 400 500 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 50 100 150 200 250 300 350 1.0e+01 1.0e+02 1.0e+03 1.0e+04 1.0e+05 1.0e+06 1.0e+07 frequency [hz] output impedance [ ? ] av=1 av=10 av=100 open loop gain and phase vs. frequency -20 -10 0 10 20 30 40 50 60 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] open loop gain [db] -180 -135 -90 -45 0 45 90 135 180 phase [degrees] ga in phase open loop gain and phase vs. frequency -20 -10 0 10 20 30 40 50 60 1.e+03 1.e+04 1.e+05 1.e+06 1.e+07 frequency [hz] open loop gain [db] -180 -135 -90 -45 0 45 90 135 180 phase [degrees] ga in phase ? open loop gain and phase vs. frequency ? open loop gain and phase vs. frequency (vdd=1.6v, ta=25 c) (vdd=5v, ta=25 c) ? output impedance vs. frequency ? output impedance vs. frequency (vdd=1.6v, ta=25 c) (vdd=5v, ta=25 c) output impedance[ ] output impedance[ ]
[ak2921] rev.1.00ea 2012/4 - 7 - ? large signal transient response ? large signal transient response (vdd/vss = +0.8v/- 0.8v, (vdd/vss = +2.5v/-2.5v ta = 25c, cl = 150pf) ta = 25c, cl = 150pf) ? small signal transient response ? small signal transient response (vdd/vss = +0.8v/- 0.8v, (vdd/vss = +2.5v/-2.5v ta = 25c, cl = 150pf) ta = 25c, cl = 150pf) large sigmnal transient response -1 -0.75 -0 .5 -0.25 0 0. 25 0.5 0. 75 1 time (4 s/div) output voltage (0.25v/div) large sigmnal transient response -4 -3 -2 -1 0 1 2 3 4 time (4 s/div) output voltage (1v/div) small sigmnal 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 sigmnal 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/ di v)
[ak2921] rev.1.00ea 2012/4 - 8 - small signal overshoot vs. loadcapacitance 0 5 10 15 20 25 30 35 40 45 50 1 10 100 1000 load capacitance [pf] overshoot [%] os os small signal overshoot vs. loadcapacitance 0 5 10 15 20 25 30 35 40 45 50 1 10 100 1000 load capacitance [pf] overshoot [%] os os ? small signal overshoot vs. load capacitance ? small signal overshoot vs. load capacitance (vdd=1.6v, 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) positive overvoltage recovery time (10 sec/div) voltage [v] negative overvoltage recovery time (10 sec/div) voltage [v] input = 50mv/div output = 1v/div av = -50v rl=10k av = -50v rl=10k input = 50mv/div output = 1v/div
[ak2921] rev.1.00ea 2012/4 - 9 - cmrr 0 20 40 60 80 100 120 140 160 1.e+00 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 frequency [hz] cmrr [db] 1.6v 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] 1.6v_vdd 1.6v_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 ? common mode rejection ratio vs. frequency ? power supply rejection ratio vs. frequency ? power supply rejection ratio vs. frequency (vdd=1.6v, ta=25 c) (vdd=5v, ta=25 c)
[ak2921] rev.1.00ea 2012/4 - 10 - ? power supply rejection ratio vs. temperature ? maximum output swing vs. frequency ? maximum output swing vs. frequency (vdd=1.6v, 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 -40-20 0 20406080 temperature [ ] psrr [db] maxi mum output swi ng 0 0.4 0.8 1.2 1.6 2 1.e +0 1 1 .e+02 1.e +0 3 1 .e+04 1.e +0 5 1 .e+06 1.e +0 7 frequency [hz] maximum output swing [v] maxi mum output swi ng 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 +0 7 frequency [hz] maximum output swing [v]
[ak2921] rev.1.00ea 2012/4 - 11 - ? voltage noise density ? voltage noise density (vdd=1.6v, ta=25 c, f=0~2.5khz) (vdd=5v, ta=25 c, f=0~2.5khz) ? voltage noise density ? voltage noise density (vdd=1.6v, ta=25 c, f=0~20khz) (vdd=5v, ta=25 c, f=0~50khz) voltage noise density 0 20 40 60 80 100 120 140 160 180 200 0 500 1 000 15 00 20 00 250 0 frequency [hz] voltage noise density[nv/ hz] voltage noise density 0 20 40 60 80 100 120 140 160 180 200 0 500 1 000 15 00 20 00 250 0 frequency [hz] voltage noise density[nv/ hz] voltage noise density (f= 0 50khz) 0 20 40 60 80 100 120 140 160 180 200 0 100 00 200 00 300 00 400 00 5000 0 frequency [hz] voltage noise density [nv/ hz] volta ge noise density (f=0 50khz) 0 20 40 60 80 100 120 140 160 180 200 0 10 000 200 00 300 00 400 00 500 00 frequency [hz] voltage noise density [nv/ hz]
[ak2921] rev.1.00ea 2012/4 - 12 - ? voltage noise density (vdd=5v, ta=25 c, f=1~10khz) ? voltage noise ? voltage noise (vdd=1.6v, ta=25 c, f=0.1~10hz) (vdd=5v, ta=25 c, f=0.1~10hz) voltage noise density (f= 1 10khz) 10 100 1 000 1. e+00 1 .e+01 1.e+02 1.e+03 1.e +0 4 frequency [hz] voltage noise density [nv/ hz] 0.1hz to 10hz noise -3 -2 -1 0 1 2 3 time (sec) voltage [ v] 0.1hz to 10hz noise -3 -2 -1 0 1 2 3 time (sec) voltage [ v] vn=2.3 vpp vn=1.8 vpp
[ak2921] rev.1.00ea 2012/4 - 13 - input offset voltage drift 0 5 10 15 20 25 30 35 40 45 50 -20-15-10-5 0 5 101520 input offset voltage drift [nv/ ] number of amplifier s ? output short-circuit current vs. temperature ? maximum output swing vs. frequency (vdd=1.6v, 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) output short-circuit current -100 -80 -60 -40 -20 0 20 40 60 80 100 -40-200 20406080 temperature [ ] output short-circuit current [ma] is c+ is c- output short-circuit current -30 -20 -10 0 10 20 30 -40-200 20406080 temperature [ ] output short-circuit current [ma] is c+ is c-
[ak2921] rev.1.00ea 2012/4 - 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 4.00.2 2.8 2.9 +0.12 -0.1 0.65 0.127 +0.1 -0.05 0.550.2 0~10 0.95max 0.1 +0.1 -0.05 0.1 0.20.05 1
[ak2921] rev.1.00ea 2012/4 - 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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