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