Self-Cal op amp with digital offset nulling

The TLC4502 self-calibrating, precision dual operational amplifier offers designers a combination of DC and AC performance that makes the Self-Cal amplifier a good choice for a wide range of amplifier applications.

The device achieves precision by automatically nulling its input offset voltage to 50 uV (max) during power-up. The entire self-calibration procedure requires about 300 ms to complete and is repeatable to within +/- 3uV on successive calibrations. Once calibration is complete, the calibration circuitry falls out of the signal path and becomes transparent to the user.

Rail-to-rail output swing eases interfaces with ADCs, and 5-V single-supply operation fits well in battery-powered designs. The TLC4502 has ample output current to drive 100-ohm loads; a gain bandwidth of 4.7 MHz (typ) and a slew rate of 2.5 V/us (typ) make it useful in applications where good AC performance is necessary.

The Self-Cal device enhances design options over chopper-stabilized and costly precision bipolar amplifier solutions. Designers do not have to worry about noise and frequency limitations created by the continual chopping frequency of chopper-stabilized amplifiers.

TLC4502C 8-pin SOIC $1.28

TLC4502AC 8-pin SOIC $1.62

TLC4502I 8-pin SOIC $1.41

TLC4502AI& 8-pin SOIC $1.77

Suggested retail pricing in U.S. dollars in 1K quantity.

Features:

Self-Cal Vio = 50 uV(max) for TLC4502A, 100 uV(max) for TLC4502
Standard dual op amp pin-out with no external calibration components required
Rail-to-rail output voltage swing
High output drive capability: +/- 50 mA
300 ms typical calibration time