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GENERAL DESCRIPTION

The TC7136 and TC7136A are low-power, 3-1/2 digit with liquid crystal display (LCD) drivers with analog-to-digital converters. These devices incorporate an integrator output zero phase which guarantees overrange recovery. The performance of existing TC7126, TC7126A and ICL7126-based systems may be upgraded with minor changes to external, passive components.

FEATURES

■ Fast Overrange Recovery, Guaranteed First Reading Accuracy

■ Low Temperature Drift Internal Reference

TC7136 ....................................... 70 ppm/°C Typ

TC7136A ..................................... 35 ppm/°C Typ

■ Guaranteed Zero Reading With Zero Input

■ Low Noise .................................................... 15 μVP-P

■ High Resolution .............................................. 0.05

■ Low Input Leakage Current ...................... 1 pA Typ

10 pA Max

■ Precision Null Detectors With True Polarity at Zero

■ High-Impedance Differential Input

■ Convenient 9V Battery Operation With

Low Power Dissipation ........................ 500 μW Typ

900 μW Max

TYPICAL APPLICATIONS

■ Thermometry

■ Bridge Readouts: Strain Gauges, Load Cells, Null Detectors

■ Digital Meters: Voltage/Current/Ohms/Power, pH

■ Digital Scales, Process Monitors

■ Portable Instrumentation