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General Description:

The TC7126A is a 3-1/2 digit CMOS Analog-to-Digital Converter (ADC) containing all the active components necessary to construct a 0.05 resolution measure ment system. Seven-segment decoders, digit and polarity drivers, voltage reference, and clock circuit are integrated on-chip. The TC7126A directly drives a Liquid Crystal Display (LCD), and includes a backplane driver.

A low-cost, high resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7126A’s extremely low-power drain and 9V battery operation make it ideal for portable applications.

Features:

? Internal Reference with Low Temperature Drift:

- TC7126: 80ppm/°C, Typical

- TC7126A: 35ppm/°C, Typical

? 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 and Panel Meters:

- Voltage/Current/Ohms/Power, pH

? Digital Scales, Process Monitors