AD5270/AD5271 is a digital rheostat with single-channel, 1024-/256-position resolution, 1% resistor tolerance error, SPI interface, etc. It is suitable for mechanical rheostat replacements and can be used for variable gain control in op-amps, gain and offset adjustment in instrumentation, programmable voltage to current conversions, programmable filters, delays, etc.
The AD5270 (1024‑position) and AD5271 (256‑position) are single‑channel digital rheostats that combine high‑precision resistor performance with a 50‑time programmable non‑volatile memory. They operate from a single 2.7 V‑5.5 V supply or a dual‑supply of ±2.5 V to ±2.75 V, and maintain ±1 % end‑to‑end resistor tolerance over an industrial temperature range of –40 °C to +125 °C.
The devices are offered in compact 10‑lead LFCSP (3 mm × 3 mm × 0.8 mm) and MSOP (3 mm × 4.9 mm × 1.1 mm) packages. Key features include SPI‑compatible communication, wiper‑setting read‑back, power‑on refresh from the 50‑TP memory, and optional daisy‑chain operation for multiple devices.
| Nominal Resistance Options | 20 kΩ, 50 kΩ, 100 kΩ |
|---|---|
| Resistor Tolerance | ±1 % nominal |
| Operating Temperature Range | –40 °C to +125 °C |
| Package Types | 10‑lead LFCSP (3 mm × 3 mm × 0.8 mm) or 10‑lead MSOP (3 mm × 4.9 mm × 1.1 mm) |
The AD5270 provides 1024 discrete wiper positions, corresponding to a 10‑bit resolution.
Both devices guarantee a nominal resistor tolerance of ±1 % end‑to‑end.
Single‑supply operation uses a VDD of 2.7 V to 5.5 V with VSS tied to ground.
The 50‑TP memory stores up to 50 programmed wiper settings that are retained on power‑up.