The TC7129 is a 4-1/2 digit Analog-to-Digital Converter (ADC) that directly drives a multiplexed Liquid Crystal Display (LCD). It features high resolution, low power consumption, true differential input and reference, and is suitable for applications such as full-featured multimeters and digital measurement devices.
The TC7129 is a 4‑½‑digit analog‑to‑digital converter designed for high‑resolution, battery‑powered digital multimeter applications. It integrates a true differential input, low‑power operation, on‑chip LCD driver, over‑range/under‑range outputs and a range‑select input, making it suitable for full‑featured multimeters and other digital measurement devices.
The document provides electrical characteristics, pin descriptions for PDIP, QFP and PLCC packages, typical application circuits, power‑supply options, temperature‑compensation methods and guidance for connecting external logic. It also includes mechanical drawings, package codes and ordering information.
| Count Resolution | ±19,999 counts |
|---|---|
| Resolution on 200 mV Scale | 10 µV |
| Low Power Consumption | 500 µA at 9 V |
| Supply Voltage Range | 6 V – 12 V |
| Clock Frequency | 120 kHz (typical) |
| Common Mode Rejection Ratio | 110 dB |
| Input Leakage Current | 1 – 10 pA |
| Temperature Coefficient | 2 – 7 ppm/°C |
| DGND Voltage | 4.5 V – 5.8 V |
The TC7129 provides a count resolution of ±19,999 counts.
It consumes about 500 µA when powered from a 9 V supply.
A typical clock frequency is 120 kHz.