General Description

The DS3908 contains two nonvolatile digital poten-

tiometers with programmable-gain amplifiers buffering

the wiper outputs. The potentiometer position and

ble serial bus. The DS3908 operates in both 3.3V and

5V systems and features a write-protect pin that locks

the position of the potentiometers and gain registers. Up

Applications

Pin-Diode Biasing

Power-Supply Calibration

Cell Phones and PDAs

Portable Electronics

Features

o Two 64-Position Linear Taper Potentiometers

o Integral Wiper Buffering Amplifiers with

Selectable Gains of 1V/V, 2V/V, or 4V/V

o 100kΩ Potentiometer End-to-End Resistance

o Low Potentiometer Temperature Coefficient

o Nonvolatile Wiper and Gain Storage

o Write-Protect Pin Prevents Accidental Field

Reprogramming

o 3V to 5.5V Supply Voltage Range

o -40°C to +85°C Operating Temperature Range

o 14-Pin TDFN Package

Dual, 64-Position Nonvolatile Digital

Potentiometer with Buffered Outputs

______________________________________________ Maxim Integrated Products

1

TDFN (3mm x 3mm)

TOP VIEW

2

4

5

13

11

10

H1

L1

H0

SCL

A1

A2

1

14

SDA

3

12

V1

A0

6

9

V0

WP

7

8

L0

GND

DS3908

Pin Configuration

POT0

H0

V0

L0

H1

V1

L1

INTERFACE

SDA

SCL

A0

A1

A2

WP

VOLTAGE

REFERENCE

NV ADJUSTABLE

REFERENCE

VOLTAGE

NV ADJUSTABLE

REFERENCE

VOLTAGE

DS3908

PGA0

POT1

PGA1

Typical Operating Circuit

Rev 0; 4/06

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.

+Denotes lead-free package.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS3908N+

-40°C to +85°C

14 TDFN