ISL22426 is a digitally controlled potentiometer with 128 resistor taps that can be controlled via the SPI bus. It can be used as a three-terminal potentiometer or a two-terminal variable resistor and can be used in a variety of applications, such as control, parameter adjustments, and signal processing.
The ISL22426 integrates two digitally controlled potentiometers (DCP) and non‑volatile memory on a monolithic CMOS IC. The wipers are programmed via an SPI serial interface and retain their position after power‑down using an internal non‑volatile register.
The device is offered in 14‑lead TSSOP and 16‑lead QFN packages, supports a 2.7 V‑5.5 V supply range, and provides features such as shutdown mode, 54 µA max shutdown current, and up to 1 million data changes per register bit.
| Number of potentiometers | Two |
|---|---|
| Wiper resistance (typical) | 70 Ω @ Vcc = 3.3 V |
| Supply voltage range | 2.7 V to 5.5 V |
| Total resistance options | 10 kΩ or 50 kΩ |
| Shutdown current | 54 µA max |
| Endurance (data changes) | 1,000,000 cycles per bit per register |
| Data retention | 50 years @ T < +55 °C |
| Package options | 14‑lead TSSOP, 16‑lead QFN |
The wipers are controlled via an SPI serial interface.
The typical wiper resistance is 70 Ω when Vcc = 3.3 V.
The shutdown current is specified as 54 µA maximum.
The registers retain data for 50 years at temperatures below +55 °C.