The DS1801 is a dual audio taper potentiometer from DAL Semiconductor that has logarithmic resistive characteristics over the device range. Each potentiometer provides 65 wiper positions with a 1 dB increment per step and device mute. The 3-wire serial interface, using a CPU, provides the user the ability of reading or writing exact wiper positions of the two potentiometers. Additionally, the part contains a zero-crossing detection feature that minimizes noise resulting from wiper transitions. Packages for the part include a 14-pin PDIP, 16-pin SOIC, and 14-pin TSSOP.
The DS1801 provides two 65‑position logarithmic audio potentiometers with 1 dB steps, mute control, and zero‑crossing detection to minimize audible noise. It operates from 2.7 V to 5.5 V and is available in 14‑pin PDIP, 16‑pin SOIC, and 14‑pin TSSOP packages.
Control is performed via a 3‑wire serial interface (RST, CLK, D) that allows reading and writing of wiper positions, supports daisy‑chaining of multiple devices, and includes a cascade output for serial data propagation.
| Supply Voltage (VCC) | 2.7 V – 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Number of Wiper Positions | 65 positions (64 = mute) |
| Step Size | 1 dB per step |
| Total Resistance | 45 kΩ |
| Input Capacitance (CIN) | 5 pF |
| Output Capacitance (COUT) | 7 pF |
| Maximum Clock Frequency | 10 MHz |
| Standby Current (3 V) | 50 µA |
| Zero‑Crossing Detection Activation | Low state on ZCEN input |
The DS1801 operates from 2.7 V to 5.5 V supply voltage.
Zero‑crossing detection is enabled when the ZCEN input is held low.
Yes, the DS1801 supports cascade operation for linking multiple devices via the COUT pin.