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 I
2
C
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.
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Dual 256-Position Linear Digital Resistors
Available as 50kΩ/30kΩ or 50kΩ/15kΩ
Resistor Settings Stored in NV Memory
Low Temperature Coefficient
I
2
C-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
DS3902
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Audio Power-Amp Biasing
Replacement for Mechanical Variable Resistors
and DIP Switches
Ordering Information
PART
DS3902U-530
DS3902U-515
RESISTOR
VALUES
(R0, R1)
30kΩ, 50kΩ
15kΩ, 50kΩ
TOP
MARK
3902A
3902B
PIN-
PACKAGE
8 µSOP
8 µSOP
Ordering Information continued at end of data sheet.
Typical Operating Circuit
V
CC
IN+
IN-
TX_DISABLE
TX_FAULT
V
CC
0.1μF
4.7kΩ
2-WIRE
MASTER
4.7kΩ
V
CC
OUT-
SCL
SDA
DS3902
H0
H1
BIAS SET
MOD SET
BIASMAX
2
APCSET
2
MODSET
2
PC_MON
BS_MON
LASER
DRIVER IC
OUT+
BIAS+
BIAS-
MD
V
CC
ADD_SEL
1
GND
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.
Pin Configuration appears at end of data sheet.
______________________________________________
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.
Dual, NV, Variable Resistors
with User EEPROM
DS3902
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
, SDA, SCL, H0,
and H1 Relative to Ground................................-0.5V to +6.0V
Voltage Range on ADD_SEL Relative
to Ground ...............-0.5V to (V
CC
+ 0.5V), not to exceed 6.0V
Resistor Current ....................................................................3mA
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature ...............................................See IPC/JEDEC
J-STD-020A Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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