The DS1867 is a dual digital potentiometer with EEPROM from Texas Instruments. It operates on a single 5V or ±5V supply, has low power consumption, and maintains the position of the potentiometer in the absence of power. Two 256-position digital potentiometers can be read and written simultaneously via the serial port, and the resistors can be connected in series to increase the total resistance.
The DS1867 is a non‑volatile dual digital potentiometer offering two 256‑position wipers, low power consumption and operation from a single 5 V or ±5 V supply. Communication is via a 3‑wire serial interface that supports read/write of wiper positions and stack selection, and multiple devices can be cascaded on a single bus.
The document provides detailed pin descriptions, timing diagrams, electrical characteristics, absolute and relative linearity data, and typical application circuits such as an inverting variable‑gain amplifier and a fixed‑gain attenuator. It also outlines power‑down EEPROM behavior, write endurance, and recommended operating conditions.
| Supply Voltage (VCC) | 4.5 V – 5.5 V |
|---|---|
| Supply Current (ICC) | 250 µA – 900 µA |
| Wiper Resistance (RW) | 400 Ω – 1000 Ω |
| EEPROM Write Endurance | >25,000 writes |
| Operating Temperature Range | -40 °C to +85 °C |
The wiper position is stored in EEPROM shadow memory, so it is maintained in the absence of power.
The DS1867 is available in 10 kΩ, 50 kΩ and 100 kΩ resistance options.
Each DS1867 transmits 17 bits; the total bits equal 17 times the number of devices in the chain.
A minimum power‑down time of 4 ms is required for the wiper position to be stored.