Rev 0; 1/06
Dual NV Audio Taper Digital Potentiometer
The DS1881 is a dual, nonvolatile (NV) digital poten-
tiometer designed to operate in audio systems that
require 5V signal levels. The potentiometer settings can
be stored in EEPROM so that they are retained when the
power is cycled. The DS1881 has separate supplies for
the potentiometers (VCC) and the communication circuit-
ry (VDD). For clickless/popless operation, a zero-crossing
detector allows the wiper position to change when there
is no voltage across the potentiometer. The device is
also designed to minimize crosstalk, and the two digital
potentiometers provide 0.5dB channel-to-channel match-
ing to prevent volume differences between channels.
Total harmonic distortion (THD) is also minimal as long
as the wiper drives a high-impedance load.
Two attenuation configuration options provide optimum
flexibility for the specific application. Configuration
Option 1 provides 63 logarithmic tapered steps (0dB to
-62dB, 1dB/step) plus a mute setting. Configuration
Option 2 has 32 logarithmic steps plus mute and pro-
vides software compatibility with the DS1808. When
Configuration Option 2 is used in combination with the
16-pin SO package, the DS1881 is both software and pin
compatible with the DS1808 in 5V applications.
Notebook and PC Audio
Portable Audio Equipment
♦ Dual, Audio Log Taper Potentiometers
♦ Low THD+N and Crosstalk
♦ 5V Analog Supply (Independent of Digital Supply)
♦ 3V to 5V Digital Supply Range
♦ Potentiometer Settings Configurable as NV
♦ Zero-Crossing Detector Eliminates Switching
♦ Two User-Configurable Attenuation Options
♦ Configuration Option 1: 63 Positions Provide 1dB
Attenuation Steps from 0dB to -62dB Plus Mute
♦ Configuration Option 2: (Software-Compatible
with the DS1808): 33 Positions Plus Mute as
Positions 0–12: 1dB per Step for 12 Steps
Positions 13–24: 2dB per Step for 12 Steps
Positions 25–32: 3dB per Step for 8 Steps
♦ I2C*-Compatible Serial Interface
♦ Three Address Pins Allow Up to 8 Devices on
♦ 45kΩ Potentiometer End-to-End Resistance
♦ Industrial Temperature Range (-40°C to +85°C)
♦ 16-Pin TSSOP or SO Package
-40°C to +85°C
DS1881E-045+T&R -40°C to +85°C 45 (173 mils)
-40°C to +85°C
DS1881Z-045+T&R -40°C to +85°C 45 (150 mils)
+Denotes lead-free package.
Typical Operating Circuit appears at end of data sheet.
Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.