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
