LTC1286/LTC1298 Micropower Sampling 12-Bit A/D Converters
The LTC1286 and LTC1298 are micropower, 12‑bit successive‑approximation A/D converters offered in 8‑lead SOIC and DIP packages. They operate from a single supply (4.5 V‑9 V for LTC1286, 4.5 V‑5.5 V for LTC1298) and feature ultra‑low supply currents, auto‑shutdown, and SPI‑compatible serial interfaces.
Typical applications include battery voltage monitoring, sensor interfacing, and remote data acquisition. The document provides detailed electrical characteristics, pin descriptions, block diagrams, and example circuits to aid designers in integrating these converters into their systems.
| Resolution | 12 Bits |
|---|---|
| Typical Supply Current | 250 µA |
| Auto‑Shutdown Current | 1 nA |
| Conversion Time | 60 µs |
| Maximum Sample Rate (LTC1286) | 12.5 ksps |
| Maximum Sample Rate (LTC1298) | 11.1 ksps |
| Supply Voltage Range (LTC1286) | 4.5 V to 9 V |
| Supply Voltage Range (LTC1298) | 4.5 V to 5.5 V |
The typical supply current is 250 µA.
The LTC1286 has a conversion time of about 60 µs.
Pin 8 (Vec) supplies the power voltage to the ADC.
The LTC1298 can sample up to 11.1 ksps.