TC7126RCPL

3-1 / 2位模拟 - 数字转换器 3-1/2 Digit Analog-to-Digital Converters

GENERAL DESCRIPTION

The TC7126A is a 3-1/2 digit CMOS analog-to-digital

converter ADC containing all the active components nec

essary to construct a 0.05% resolution measurement sys

tem. 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

■ Low Temperature Drift Internal Reference

    TC7126 ....................................... 80 ppm/°C Typ

    TC7126A ..................................... 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 and Panel Meters

    — Voltage/Current/Ohms/Power, pH

■ Digital Scales, Process Monitors