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GENERAL DESCRIPTION

The TC811 is a low power, 3-1/2 digit, LCD display analog-to-digital converter. This device incorporates both a display hold feature and differential reference inputs. A crystal oscillator, which only requires two pins, permits added features while retaining a 40-pin package. An additional feature is an Integrator Output Zero phase which guarantees rapid input overrange recovery.

FEATURES

■ Differential Reference Input

■ Display Hold Function

■ Fast Over-Range Recovery, Guaranteed Next Reading Accuracy

■ Low Temperature Drift Internal Reference ....................................... 35ppm/°C (Typ)

■ Guaranteed Zero Reading With Zero Input

■ Low Noise ..................................................... 15μVp-p

■ High Resolution (0.05) and Wide Dynamic Range (72 dB)

■ High Impedance Differential Input

■ Low Input Leakage Current ....................... 1pA Typ 10pA Max

■ Direct LCD Drive – No External Components

■ Precision Null Detection with True Polarity at Zero

■ Crystal Clock Oscillator

■ Available in DIP, Compact Flat Package or PLCC

■ Convenient 9V Battery Operation with Low Power Dissipation (600μA Typical, 1mW Maximum)

TYPICAL APPLICATIONS

■ Thermometry

■ Digital Meters

— Voltage/Current/Power

— pH Measurement

— Capacitance/Inductance

— Fluid Flow Rate/Viscosity

— Humidity

— Position

■ Panel Meters

■ LVDT Indicators

■ Portable Instrumentation

■ Digital Scales

■ Process Monitors

■ Gaussometers

■ Photometers