TC7109/A is a 12-bit plus sign, CMOS low power analog-to-digital converter (ADC) with features such as fast recovery from input overloads, elimination of cross-talk in multiplexed systems. It has true differential signal input and differential reference input, low noise, low input current, and no zero adjustment needed. TC7109/A also provides a versatile digital interface that can operate with industry standard UARTs.
The TC7109/A is a 12‑bit plus‑sign, low‑power analog‑to‑digital converter that requires only eight passive components and a crystal for a complete dual‑slope integrating ADC. It offers true differential signal and reference inputs, low input noise (15 µV p‑p typ.) and ultra‑low input bias current (1 pA typ.), making it suitable for bridge‑type transducers such as load cells and thermocouples.
The device provides both Direct parallel bus mode and UART Handshake mode for data output, and includes a comprehensive pin‑out with 40 pins in the PDIP package. Electrical specifications cover supply voltage ranges (+6.2 V / –9 V), supply current (≈700 µA typ.), and output voltage levels (3.5 V high, 0.2 V low). Handling precautions emphasize antistatic measures and proper power‑on sequencing to avoid latch‑up.
| Resolution | 12‑bit |
|---|---|
| Input Noise (typ.) | 15 µV p‑p |
| Input Bias Current (typ.) | 1 pA |
| Supply Current (V+ to GND, typ.) | 700 µA |
| Output High Voltage | 3.5 V |
| Output Low Voltage | 0.2 V |
The typical input noise is 15 µV peak‑to‑peak.
The PDIP version of the TC7109/A has 40 pins.
It supports a Direct parallel bus mode and a UART Handshake mode for serial data transmission.
The typical input bias current is 1 pA.