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DS1808

Maxim Integrated
Part Number DS1808
Manufacturer Maxim Integrated
Description Dual Log Digital Potentiometer
Published Sep 19, 2005
Detailed Description DS1808 Dual Log Digital Potentiometer www.maxim-ic.com FEATURES § Two 32-position log-tapers § 60dB attenuation range: ...
Datasheet PDF File DS1808 PDF File

DS1808
DS1808

Overview
DS1808 Dual Log Digital Potentiometer www.
maxim-ic.
com FEATURES § Two 32-position log-tapers § 60dB attenuation range: –1dB per step (12 taps) –2dB per step (12 taps) –3dB per step (8 taps) –90dB low-end attenuation § 2-Wire Interface Control § Power Supply: Dual ±12V § Maximum Voltage Across Potentiometers: ±12V § Standard Resistance Value: 45kW § Packages: 16-Pin SOIC § Operating Temperature: -40oC to +85oC PIN ASSIGNMENT GND A2 A1 VB A0 W0 L0 H0 1 2 3 4 5 6 7 8 16 VDD 15 VCC 14 SCL 13 SDA 12 CE 11 W 10 H1 9 L1 16-Pin SOIC (150-mil) ORDERING INFORMATION DS1808Z-050 16-Pin SOIC -40ºC to +85ºC 45kΩ DS1808Z-050/T&R 16-Pin SOIC -40ºC to +85ºC 45kΩ PIN DESCRIPTION VCC VB VDD H0, H1 L0, L1 W0, W1 SDA - +12V Supply - -12V Supply (substrate bias) - 5V Digital Supply - High-end Terminals - Low-end Terminals - Wiper Terminals - 2-Wire Serial Data Input/Output SCL - 2-Wire Clock Input /CE - 2-Wire Interface Enable GND - Ground A0, A1, A2 - Address Pins DESCRIPTION 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 45kW resistor value.
The DS1808 is specified to operate over the industrial temperature range (-40oC to +85oC) and is available in the 16-pin SOIC package.
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