The DS1854 dual temperature-controlled nonvolatile
(NV) variable resistors with two monitors consists of two
50kΩ 256-position linear variable resistors, two analog
monitor inputs (MON1, MON2), and a direct-to-digital
temperature sensor. The device provides an ideal
method for setting and temperature-compensating bias
voltages and currents in control applications using min-
imal circuitry. The variable resistor settings are stored in
EEPROM memory and can be accessed over the 2-wire
serial bus.
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring
Ordering Information
PART
DS1854E-050
DS1854B-050
TEMP RANGE PIN-PACKAGE
-40°C to +95°C 16 TSSOP
-40°C to +95°C 16-Ball CSBGA
Typical Operating Circuit
V
CC
V
CC
= 3.3V
4.7kΩ
2-WIRE
INTERFACE
TX-FAULT
4.7kΩ
1
2
3
4
5
LOS
GROUND TO
DISABLE WRITE
PROTECT
6
7
8
SDA
SCL
OUT1
IN1
OUT2
IN2
WPEN
GND
V
CC
H1
L1
16
15
14
DECOUPLING
CAP
Pin Configurations
TOP VIEW
A
IN1
SCL
V
CC
H1
1 SDA
2 SCL
B
OUT2
SDA
H0
3 OUT1
L1
4 IN1
C
WPEN
IN2
OUT1
5 OUT2
MON2
6 IN2
7 WPEN
MON1
4
8 GND
V
CC
16
H1 15
L1 14
H0 13
0.1µF
TO LASER BIAS
CONTROL
TO LASER
MODULATION
CONTROL
DIAGNOSTIC
INPUTS
0 TO 2.5V FS
DS1854
13
H0
12
L0
MON2
MON1
RHIZ
DS1854
L0 12
MON2 11
MON1 10
RHIZ 9
11 Rx POWER*
10 Tx BIAS*
9 Tx DISABLE
D
GND
1
L0
2
RHIZ
3
*Rx POWER AND Tx BIAS CAN BE ARBITRARILY
ASSIGNED TO THE MON INPUTS
16-BALL CSBGA (4mm x 4mm)
1.0mm PITCH
16 TSSOP
______________________________________________
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 Temperature-Controlled
Resistors with Two Monitors
DS1854
ABSOLUTE MAXIMUM RATINGS
Voltage on V
CC
Relative to Ground.......................-0.5V to +6.0V
Voltage on Inputs Relative
to Ground* ................................................-0.5V to V
CC
+ 0.5V
Voltage on Resistor Inputs
Relative to Ground*...................................-0.5V to V
CC
+ 0.5V
*Not to exceed 6.0V.
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.
Current into Resistors............................................................5mA
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
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