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GENERAL DESCRIPTION

The TC7652 is a lower noise version of the TC7650, sacrificing some input specifications (bias current and band width) to achieve a 10x reduction in noise. All the other benefits of the chopper technique are present, i.e. freedom from offset adjust, drift, and reliability problems from external trim components. Like the TC7650, the TC7652 requires only two noncritical external caps for storing the chopped null potentials. There are no significant chopping spikes, internal effects or overrange lockup problems.

FEATURES

■ Low Offset Over Temperature Range ............ 10μV

■ Ultra-Low Long-Term Drift .................150nV/Month

■ Low Temperature Drift ............................. 100nV/°C

■ Low DC Input Bias Current ............................. 15pA

■ High Gain, CMRR and PSRR ................. 110dB Min

■ Low Input Noise Voltage .........0.2μVP-P; DC to 1Hz

■ Internally-Compensated for Unity-Gain Operation

■ Clamp Circuit for Fast Overload Recovery