The ICL7129A/MAX7129 is a high‑precision 4‑1/2‑digit A/D converter that directly drives a multiplexed liquid‑crystal display. It uses a successive‑integration technique to achieve 19,999 count resolution on both 2.00000 V and 200.00 mV ranges, with low input bias and noise.
The document provides absolute maximum ratings, electrical characteristics, pin assignments, conversion technique details, and information on the on‑board display driver, range selection, low‑battery detection, continuity detection, and digital I/O functions.
| Count Resolution | 19,999 counts |
|---|---|
| Input Bias Current | 10 pA max |
| Noise | 3 µV peak‑to‑peak |
| Resolution | 10 µV |
| Full‑scale Accuracy | 0.0005 % |
| Zero‑reading Drift | 0.5 µV/°C |
| Low Battery Indicator | Provides visual and logic output |
| Overrange/Underrange Outputs | Digital outputs indicating out‑of‑range conditions |
| Range Select Ratio | 10:1 |
The device provides a count resolution of 19,999 counts.
The maximum input bias current is 10 pA.
The converter exhibits a peak‑to‑peak noise of about 3 µV.
Yes, it includes a low‑battery detector and indicator that provides a visual and logic‑level output.