DS3908 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Dual, 64-Position Nonvolatile Digital Potentiometer with Buffered Outputs

Rev 0; 4/06
Dual, 64-Position Nonvolatile Digital
Potentiometer with Buffered Outputs
General Description
The DS3908 contains two nonvolatile digital poten-
tiometers with programmable-gain amplifiers buffering
the wiper outputs. The potentiometer position and
amplifier gain are controlled through an I²C*-compati-
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
to eight DS3908s can be placed on a single I²C bus.
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 I²C-Compatible Interface
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
Pin-Diode Biasing
Power-Supply Calibration
Cell Phones and PDAs
Portable Electronics
Applications
Ordering Information
PART
TEMP RANGE
DS3908N+
-40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
14 TDFN
Typical Operating Circuit
V_CC
DS3908
SDA
SCL
A0
I²C
A1 INTERFACE
A2
WP
POT0
H0
V0
PGA0
L0
POT1
H1
V1
PGA1
L1
VOLTAGE
REFERENCE
NV ADJUSTABLE
REFERENCE
VOLTAGE
NV ADJUSTABLE
REFERENCE
VOLTAGE
Pin Configuration
TOP VIEW
SDA 1
SCL 2
A0 3
A1 4
A2 5
WP 6
GND 7
DS3908
14 V_CC
13 H1
12 V1
11 L1
10 H0
9 V0
8 L0
TDFN (3mm x 3mm)
I²C is a trademark of Philips Corp. 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.