TC7650

1 TC7650 CHOPPER-STABILIZED OPERATIONAL AMPLIFIER FEATURES Low Input Offset Voltage ......................... 0.7µV Typ Low Input Offset Voltage Drift ......... 0.05µV/°C Max Low Input Bias Current ............................ 10pA Max High Impedance Differential CMOS Inputs .... 1012Ω High Open-Loop Voltage Gain ................ 120dB Min Low Input Noise Voltage ............................ 2.0µVp-p High Slew Rate .......................................... 2.5V/µsec Low-Power Operation ..................................... 20mW Output Clamp Speeds Recovery Time Compensated Internally for Stable Unity Gain Operation s Direct Replacement for ICL7650 s Available in 8-Pin Dip and 14-Pin Dip s s s s s s s s s s GENERAL DESCRIPTION The TC7650 CMOS chopper-stabilized operational amplifier practically removes offset voltage error terms from system error calculations. The 5µV maximum VOS specification, for example, represents a 15 times improvement over the industry-standard OP07E. The 50nV/°C offset drift specification is over 25 times lower than the OP07E. The increased performance eliminates VOS trim procedures, periodic potentiometer adjustment and the reliability problems caused by damaged trimmers. The TC7650 performance advantages are achieved without the additional manufacturing complexity and cost incurred with laser or "zener zap" VOS trim techniques. The TC7650 nulling scheme corrects both DC VOS errors and VOS drift errors with temperature. A nulling amplifier alternatel...