Microchip Technology TC7136RCPL

Description
The TC7136 and TC7136A are low-power, 3-1/2 digit analog-to-digital converters with liquid crystal display (LCD) drivers. They incorporate an "integrator output zero" phase for over range recovery. The TC7136A has an improved internal zener reference voltage circuit that maintains the analog common temperature drift to 35ppm/°C (typical) and 75ppm/°C (maximum). The TC7136 and TC7136A limit linearity error to less than 1 count on 200mV or 2V full scale ranges. The roll-over error (the difference in readings for equal magnitude, but opposite polarity input signals) is below ±1 count. High-impedance differential inputs offer 1pA leakage currents and a 1012Ω input impedance. The differential reference input allows ratiometric measurements for ohms or bridge transducer measurements. The 15µVp.p noise performance ensures a "rock solid" reading. The auto-zero cycle enables a zero display readout for a 0V input.

Features
Fast Over Range Recovery, Ensured First Reading Accuracy
Low Temperature Drift Internal Reference
TC7136: 70ppm/°C (Typ.)
TC7136A: 35ppm/°C (Typ.)
Zero Reading with Zero Input
Low Noise: 15µVp.p
High Resolution: 0.05%
Low Input Leakage Current: 1pA (Typ.)/10pA (Max.)
Precision Null Detectors with True Polarity at Zero
High-Impedance Differential Input
Convenient 9V Battery Operation with Low Power Dissipation: 500μW (Typ.)/900μW (Max.)

Applications
Thermometry
Bridge Readouts: Strain Gauges, Load Cells, Null Detectors
Digital Meters: Voltage/Current/Ohms/Power, pH
Digital Scales, Process Monitors
Portable Instrumentation