Rev 0; 6/02
Triple 128-Position Nonvolatile
Digital Potentiometer
General Description
The DS3903 contains three nonvolatile (NV) low tem-
perature coefficient digital potentiometers, which can
be accessed through a 2-wire bus. It operates in both
3V and 5V systems, and it features a write-protect pin
that can lock the positions of the potentiometers. An
address pin allows two DS3903s to be placed on the
same 2-wire bus.
Features
鈾?/div>
Three 128-Position Linear Potentiometers
(Two 10k鈩? One 90k鈩?
鈾?/div>
NV Wiper Storage
鈾?/div>
0 to 5.5V on Any Potentiometer Terminal
Independent of V
CC
鈾?/div>
Low End-to-End Temperature Coefficient
鈾?/div>
Operates on an Industry-Standard 2-Wire Bus
鈾?/div>
Write-Protect Pin
鈾?/div>
Supply Voltage: 3V or 5V
鈾?/div>
Operating Temperature Range: -40擄C to +85擄C
鈾?/div>
Packaging: 20-Pin TSSOP
DS3903
Applications
Power-Supply Calibration
Mobile Phones and PDAs
Fiber Optics Transceiver Modules
Portable Electronics
A Small, Low-Cost Replacement for Mechanical
Potentiometers
Ordering Information
PART
DS3903E-020
DS3903E-020/T&R
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
20 TSSOP
20 TSSOP
(Tape-and-Reel)
Pin Configuration
SDA 1
SCL 2
A0 3
WP 4
N.C. 5
L0 6
W1 7
L1 8
L2 9
GND 10
20 V
CC
19 N.C.
18 N.C.
17 N.C.
0.1碌F
4.7k鈩?/div>
2-WIRE
MASTER
V
CC
Typical Operating Circuit
V
CC
DS3903
V
CC
4.7k鈩?/div>
SCL
SDA
POTENTIOMETER 0
10k鈩?/div>
ADDDR F9h
V
CC
POTENTIOMETER 1
90k鈩?/div>
ADDDR F8h
GND
POTENTIOMETER 2
10k鈩?/div>
ADDDR FAh
5.1k鈩?/div>
Iref
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
V
CC
DS3903
16 N.C.
15 H0
14 W0
13 H1
12 W2
11 H2
VREF1
WP
A0
HIGH-OUTPUT-IMPEDANCE
VOLTAGE REFERENCE
VREF2
TSSOP
MAX427
BUFFERED
VOLTAGE
REFERENCE
_____________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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