DS3903 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Triple 128-Position Nonvolatile Digital Potentiometer

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.
Applications
Power-Supply Calibration
Mobile Phones and PDAs
Fiber Optics Transceiver Modules
Portable Electronics
A Small, Low-Cost Replacement for Mechanical
Potentiometers
Features
♦ Three 128-Position Linear Potentiometers
(Two 10kΩ, One 90kΩ)
♦ NV Wiper Storage
♦ 0 to 5.5V on Any Potentiometer Terminal
Independent of V_CC
♦ Low End-to-End Temperature Coefficient
♦ Operates on an Industry-Standard 2-Wire Bus
♦ Write-Protect Pin
♦ Supply Voltage: 3V or 5V
♦ Operating Temperature Range: -40°C to +85°C
♦ Packaging: 20-Pin TSSOP
Ordering Information
PART
DS3903E-020
DS3903E-020/T&R
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 20 TSSOP
-40°C to +85°C
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
DS3903
20 V_CC
19 N.C.
18 N.C.
17 N.C.
16 N.C.
15 H0
14 W0
13 H1
12 W2
11 H2
TSSOP
Typical Operating Circuit
0.1µF
2-WIRE
MASTER
VCC
DS3903
VCC
4.7kΩ 4.7kΩ
POTENTIOMETER 2
10kΩ
ADDDR FAh
SCL
SDA
POTENTIOMETER 0
10kΩ
WP
ADDDR F9h
A0
POTENTIOMETER 1
90kΩ
ADDDR F8h
GND
VCC
5.1kΩ
Iref
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
VCC
VREF1
HIGH-OUTPUT-IMPEDANCE
VOLTAGE REFERENCE
VCC
MAX427
VREF2
BUFFERED
VOLTAGE
REFERENCE
_____________________________________________ Maxim Integrated Products 1
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