DIGITAL AUDIO POTENTIOMETER PROVIDES HIGH-VOLTAGE BIPOLAR COMPATIBILITY
DALLAS, Texas-August 23, 2001-Dallas Semiconductor/Maxim introduces the DS1808 high-voltage, dual digital potentiometer.
The DS1808 is a high-voltage, dual-channel, digitally controlled, log-taper potentiometer. Each 50k potentiometer is comprised of 32 wiper terminal positions plus a mute position. The DS1808 has three accessible terminals that include the high-side terminal (H), the low-side terminal (L), and the wiper terminal (W). The logarithmic attenuation resolution provides 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 device exhibits exceptionally low THD of 0.0005% and interchannel cross-talk better than -100db. Additionally, the mute position provides greater than 90dB of attenuation. The wiper position on the resistor ladder is selected via a 6-bit register, which value is controlled by the industry standard 2-wire interface consisting of two control signals: SDA and SCL. The DS1808 is available in a standard 16-pin SO package and is specified to operate over the industrial temperature range (-40°C to +85°C).
The DS1808 was designed for low-cost, high-performance audio applications that demand logic level control of bipolar analog signals of up to ±12V. The device is specified to operate from standard 5V logic level and ±12V supplies.
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