DS3902 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Dual, NV, Variable Resistors with User EEPROM

Rev 0; 5/04
Dual, NV, Variable Resistors
with User EEPROM
General Description
The DS3902 features a dual, nonvolatile (NV), low tem-
perature-coefficient, variable digital resistor with 256
user-selectable positions. The DS3902 can operate
over a wide supply range of 2.4V to 5.5V, and commu-
nication with the device is achieved through an I²C™-
compatible serial interface. Internal address settings
allow the DS3902 slave address to be programmed to
one of 128 possible addresses. The low cost and the
small size of the DS3902 make it an ideal replacement
for conventional mechanical-trimming resistors.
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Audio Power-Amp Biasing
Replacement for Mechanical Variable Resistors
and DIP Switches
Features
♦ Dual 256-Position Linear Digital Resistors
♦ Available as 50kΩ/30kΩ or 50kΩ/15kΩ
♦ Resistor Settings Stored in NV Memory
♦ Low Temperature Coefficient
♦ I²C-Compatible Serial Interface
♦ Wide Operating Voltage (2.4V to 5.5V)
♦ Software Write Protection
♦ User-EEPROM Memory
♦ Programmable Slave Address
♦ Operating Temperature Range: -40°C to +95°C
♦ Small 8-Pin µSOP Package
Ordering Information
PART
RESISTOR
VALUES
(R0, R1)
TOP
BRAND
DS3902U-530
DS3902U-515
30kΩ, 50kΩ
15kΩ, 50kΩ
3902A
3902B
*Add /T&R for Tape & Reel orders.
PIN-
PACKAGE
8 µSOP
8 µSOP
Typical Operating Circuit
V_CC
0.1µF
4.7kΩ
2-WIRE
MASTER
V_CC
4.7kΩ
SCL ^DS3902
SDA
ADD_SEL¹
GND
H0 ^{BIAS SET}
H1 ^{MOD SET}
NOTES:
1. WITH ADD_SEL TIED TO GND, THE SLAVE ADDRESS WILL BE A2H.
2. FOR A DETAILED APPLICATION DIAGRAM OF A SPECIFIC LD,
CONSULT THE LASER DRIVER DATA SHEET.
IN+
IN-
TX_DISABLE
TX_FAULT
BIASMAX²
APCSET²
MODSET²
LASER
DRIVER IC
PC_MON
BS_MON
OUT-
OUT+
BIAS+
BIAS-
MD
V_CC
V_CC
Pin Configuration appears at end of data sheet.
I²C is a trademark of Philips Corp. Purchase of I²C components of Maxim Integrated Products, Inc., or one of its Associated
Companies, conveys a license under the Philips I²C Patent Rights to use these components in an I²C system, provided that the sys-
tem 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.