DS1808

Voltage on All Pins (except /CE, SDA, SCL, VB A0, A1, and A2)
   Relative to Ground ............................................................- 0.3V to VCC + 0.3V
Voltage on Pins /CE, SDA, SCL, A0, A1, and A2 GND ............- 0.3V to VDD + 0.3V
Operating Temperature ...............................................................-40°C to +85°C
Storage Temperature ................................................................-55°C to +125°C
Soldering Temperature ............................................See J-STD-020A specification

*This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

The DS1808 is a dual-channel, digitally controlled, log-taper potentiometer. Each potentiometer is comprised of 32 wiper terminal positions plus a mute position. The device has three accessible potentiometer terminals that include the high-side terminal (H), the low-side terminal (L), and the wiper terminal (W). The resolution of the DS1808 is shown in Figure 8 and represents 1dB per step for the first 12 taps, 2dB per step for the next 12 taps and 3dB per step for the bottom 8 taps, providing a total attenuation range of 60dB. The mute position of the DS1808 provides greater than 90dB of attenuation. The wiper position on the resistor ladder is selected via a 6-bit register, whose value is controlled by the industry-standard 2-wire interface. The interface consists of two control signals: SDA and SCL. The DS1808 is available in a standard 45kresistor value. The DS1808 is specified to operate over the industrial temperature range (-40oC to +85oC) and is available in the 16-pin SOIC package. The DS1808 was designed for low-cost, stereo volume control applications. The device is specified to operate from ±12V ±10% supplies and accept a maximum input signal range of ±12V.