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DS3902 Datasheet

  • DS3902

  • Dual, NV, Variable Resistors with User EEPROM

  • 651.42KB

  • 11頁

  • MAXIM   MAXIM

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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 I
2
C鈩?
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.
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
鈾?/div>
Features
Dual 256-Position Linear Digital Resistors
Available as 50k鈩?30k鈩?or 50k鈩?15k鈩?/div>
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擄C to +95擄C
Small 8-Pin 碌SOP 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)
30k鈩? 50k鈩?/div>
15k鈩? 50k鈩?/div>
TOP
BRAND
3902A
3902B
PIN-
PACKAGE
8 碌SOP
8 碌SOP
*Add
/T&R for Tape & Reel orders.
Typical Operating Circuit
V
CC
IN+
IN-
TX_DISABLE
TX_FAULT
V
CC
0.1碌F
4.7k鈩?/div>
2-WIRE
MASTER
4.7k鈩?/div>
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.
I
2
C is a trademark of Philips Corp. Purchase of I
2
C components of Maxim Integrated Products, Inc., or one of its Associated
Companies, conveys a license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the sys-
tem conforms to the I
2
C 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鈥檚 website at www.maxim-ic.com.

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