The MAX5128 is a nonvolatile, single-channel, linear-taper digital potentiometer with 128 taps and 22kΩ end-to-end resistance. It replaces the function of a mechanical potentiometer with a simple 2-wire digital interface. The MAX5128 features an ultra-small 2mm x 2mm µDFN package and a low standby supply current of 0.5µA (typical), making it ideal for portable applications. The digital potentiometer can recall the programmed wiper position from nonvolatile memory and can be programmed using a simple 2-wire up/down interface. It provides a low temperature coefficient of 5ppm/°C and is specified over the extended -40°C to +85°C temperature range.
The MAX5128 digital potentiometer replaces a mechanical potentiometer with a 2‑wire up/down interface. It offers 128 tap positions, 22 kΩ end‑to‑end resistance, and a low 0.5 µA standby current, making it suitable for portable consumer electronics, LCD backlight adjustment, and bias settings.
The device operates from a single supply of +2.7 V to +5.25 V, provides a 7‑bit resolution, and features a 4 ppm/°C ratiometric temperature coefficient. It includes non‑volatile memory that retains the wiper position for up to 50 years and supports up to 80,000 store cycles.
| End‑to‑End Resistance | 22 kΩ |
|---|---|
| Number of Tap Positions | 128 |
| Supply Voltage Range | +2.7 V to +5.25 V |
| Resolution | 7 bits |
| Wiper Capacitance | 20 pF |
| Wiper Store Cycles | 80,000 |
| Data Retention | 50 years at +85 °C |
The MAX5128 operates from +2.7 V to +5.25 V.
It provides 128 tap positions.