1 parameter symbol limit unit power supply voltage vdd 10 v input voltage vin vss-0.3 to vdd+0.3 v differential input voltage vid vdd-vss v output voltage vout vss-0.3 to vdd+0.3 v output short circuit continuous sec.* power dissipation pd 300 mw operating temperature top -30 to +80 c storage temperature tstg -55 to +125 c ELM842B cmos low power operational amplifier ELM842B is low voltage and low power cmos single operational amplifier which makes it easy to design circuits and operates from a 1.2v single power source. as for power supply voltage, elm recommends to use within the range of 1 . 2 v to 5 . 5 v. the consumption current of ELM842B is low; on the other hand, since the output stage of ELM842B is class a operation drive, ELM842B is able to provide current supply of 90a(typ. at vdd=1.5v). ELM842B is suitable for signal process of applications which require low power. ? operation from a single power source ? input available within the range of power supply voltage ? low voltage operation : 1.2vvdd5.5v ? low current consumption : typ.130a(vdd=1.5v) ? unity gain bandwidth : typ.1.0mhz(vdd=1.5v) ? package : sot-25 ? battery-operated portable devices ? signal process in low power circuit ? low voltage analog circuit * when power supply voltage is below 5.0v, short of output terminal will do no damage to the ic. when power supply voltage is above 5.0v, it may cause short of vdd and result in reliability damage of the ic. parameter symbol min. typ. max. unit power supply voltage vdd 1.2 5.5 v operating temperature top -20 +70 c ELM842B-x 1 2 3 5 4 - + pin no. pin name 1 out 2 vdd 3 in+ 4 in- 5 vss standard circuit 2 2 k + - e l m 8 4 2 b 2 0 0 k v i n v o u t ? ? symbol a product version b b taping direction s, n: refer to pkg file elm842 b - x a b general description features application maximum absolute ratings suggested operating condition selection guide pin configuration sot-25(top view) 4 -
2 parameter symbol condition min. typ. max. unit input offset voltage vio vout=vdd/2 10 mv input bias current iib 1 na common-mode input voltage range vcmr 0.04 2.90 v maximum output voltage swing vouts vid=100mv, rl=200k 2.80 v maximum output source current isource vid=100mv 45 100 a open-loop gain avd vout=300mv, rl=200k 80 db common-mode rejection ratio cmrr 85 db supply voltage rejection ratio psrr 80 db current consumption iss vout=vdd/2, no-load 145 360 a unity gain bandwidth gbw 1 mhz slew rate sr rl=200k, cl=20pf 0.45 1.00 v/s parameter symbol condition min. typ. max. unit input offset voltage vio vout=vdd/2 10 mv input bias current iib 1 na common-mode input voltage range vcmr 0.08 1.45 v maximum output voltage swing vouts vid=100mv, rl=200k 1.42 v maximum output source current isource vid=100mv 40 90 a open-loop gain avd vout=300mv, rl=200k 75 db common-mode rejection ratio cmrr 75 db supply voltage rejection ratio psrr 75 db current consumption iss vout=vdd/2, no-load 130 310 a unity gain bandwidth gbw 1 mhz slew rate sr rl=200k, cl=20pf 0.45 1.00 v/s electrical characteristics vss=0v, top=25 c marking ? ? ? symbol mark content a c ELM842B b 0 to 9 lot no. c 0 to 9 lot no. sot-25 vss=0v, top=25 c ELM842B cmos low power operational amplifier 4 - vdd=1.5v vdd=3.0v
3 1) load resistance ELM842B is designed for low power consumption applications; hence, the output source current is only 90a (typ. at vdd=1.5v). as a result, ELM842B is not able to maintain output voltage swing when trying to drive small load resistance. considering this, load and feedback resistance for ELM842B should be selected carefully. elm recommends the following operating temperature range. < power supply voltage > < total resistance value of load/feedback resistor > vdd5.5v : r250k vdd3.6v : r200k vdd1.8v : r150k ELM842B is designed to be most suitable for single power source; therefore, ELM842B is able to share power supply with logic circuit one. meanwhile, ELM842B can also operate from double power sources .to protect power supplies of ELM842B and logic circuit from noise, please separate wire from power supply and use decoupling (bypass) capacitor. using the capacitor can improve psrr characteristics, especially on 10khz to 100khz or more. when op-amp circuit is used with feedback resistor, oscillation may happen in the circuit with loop-gain like unity gain follower. a) when large feedback resistance is used, the phase margin is decreased by its combination with the parasitic capacitance of the input part of op-amp. in this situation, please connect small capacitor parallelly with feedback resistor as shown in ?g-1. b) for capacitive load, external resistor in series connection will be ef fective as shown in ?g-2. c) being used as an unity gain follow, ELM842B is able to drive capacitive load of 100pf directly without oscillation. ELM842B is able to maintain operation when supply voltage is below 1.2v (vdd1.2v) since all input voltage is acceptable within the range of power supply voltage. however, ac characteristics will become weak under this situation because of the decrease of bias current in the ic. for further information, please contact elm. note 2) operation from single power source 3) feedback 4) operation at vdd<1.2v a) ?g-1 b) ?g-2 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 4 - ELM842B cmos low power operational amplifier
4 typical characteristics 4 - 1 2 3 4 5 6 20 40 60 80 100 120 140 160 180 200 0 vdd (v) source current ( ? a) source current - vdd -20 -10 0 10 20 30 40 50 60 70 50 100 150 200 top ( ? ) source current ( ?a) vdd=3v vdd=1.5v source current - top 10 1 10 2 10 3 10 4 10 5 10 6 10 7 -10 0 10 20 30 40 50 60 70 80 90 100 freq (hz) av (db) vdd=1.5v av -freq 1 2 3 4 5 6 20 40 60 80 100 120 140 160 180 200 0 vdd (v) iss ( ? a) no load iss - vdd 0 1 2 3 4 5 6 10 -2 10 -1 10 0 10 1 10 2 vdd (v) sink current (ma) sink current - vdd 1 2 3 4 5 6 1 2 3 4 5 6 0 vdd (v) vout(v) rl=100k ? rl=47k ? rl=20k ? vout - vdd -20 -10 0 10 20 30 40 50 60 7 0 100 150 200 250 top ( ? ) iss ( ? a) vdd=3v vdd=1.5v iss - top ELM842B cmos low power operational amplifier
|
