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DS1857 Datasheet

  • DS1857

  • Dual Temperature-Controlled Resistors with External Temperat...

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Rev 0; 1/03
Dual Temperature-Controlled Resistors with
External Temperature Input and Monitors
General Description
The DS1857 dual temperature-controlled nonvolatile
(NV) variable resistors with external temperature input
and monitors consists of two 50k鈩?256-position linear
variable resistors, two analog monitor inputs (MON1,
MON2), and an external temperature sensor input. The
device provides an ideal method for setting and tem-
perature-compensating bias voltages and currents in
control applications using minimal circuitry. The vari-
able resistor settings are stored in EEPROM memory
and can be accessed over the 2-wire serial bus.
Features
鈾?/div>
Four Total Monitored Channels (Temperature,
V
CC
, MON1, MON2)
鈾?/div>
Two External Analog Inputs (MON1, MON2)
鈾?/div>
Interface to External Temperature Sensor (LM50)
鈾?/div>
Two 50k鈩? Linear, 256-Position, Nonvolatile
Temperature-Controlled Variable Resistors
鈾?/div>
Resistor Settings Changeable Every 2擄C
鈾?/div>
Access to Monitoring and ID Information
Configurable with Separate Device Addresses
鈾?/div>
Resistor Disable (Open-Circuit) Function
鈾?/div>
2-Wire Serial Interface
鈾?/div>
Three Address Lines for Multiple Devices
鈾?/div>
Operates from a 3.3V or 5V Supply
鈾?/div>
SFF-8472 Compatible
DS1857
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring
Ordering Information
PART
DS1857E-050
DS1857E-050/T&R
DS1857B-050
TEMP RANGE PIN-PACKAGE
-40擄C to +95擄C 16 TSSOP
-40擄C to +95擄C
16 TSSOP
(Tape-and-Reel)
-40擄C to +95擄C 16 Ball CSBGA
Typical Operating Circuit
V
CC
V
CC
= 3.3V
4.7k鈩?/div>
2-WIRE
INTERFACE
V
CC
4.7k鈩?/div>
1
2
3
4
SDA
SCL
A0**
A1**
V
CC
H1
L1
16
DECOUPLING
CAP
Pin Configurations
0.1碌F
TOP VIEW
A
1 SDA
A1
SCL
V
CC
H1
2 SCL
3 A0
A2
SDA
H0
L1
4 A1
5 A2
6 WPEN
D
GND
1
L0
2
MON1
3
MON2
4
7 RHIZ
8 GND
V
CC
16
H1 15
L1 14
H0 13
15
14
13
12
11
TO LASER BIAS
CONTROL
B
TO LASER MODULATION
CONTROL
DS1857
H0
L0
EXTTMP
MON2
MON1
5
A2**
GROUND TO
6
DISABLE WRITE
WPEN
PROTECT
Tx DISABLE 7
RHIZ
8
GND
C
TO EXTERNAL TEMPERATURE
SENSOR, SUCH AS LM50
DIAGNOSTIC
INPUTS
0 TO 2.5V FS
DS1857
RHIZ
WPEN
A0
EXTTMP
L0 12
EXTTMP 11
MON2 10
MON1 9
10 Rx POWER*
9 Tx BIAS*
*Rx POWER AND Tx BIAS CAN BE ARBITRARILY
ASSIGNED TO THE MON INPUTS.
**ADDRESS INPUTS DETERMINE THE MAIN DEVICE 2-WIRE
SLAVE ADDRESS WHEN ADFIX = 0. THIS ADDRESS MUST BE
DIFFERENT THAN THE AUX DEVICE ADDRESS WHEN ADEN = 0.
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鈥檚 website at www.maxim-ic.com.

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