DS1859 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors

Rev 1; 11/03
Dual, Temperature-Controlled Resistors with
Internally Calibrated Monitors
General Description
The DS1859 dual, temperature-controlled, nonvolatile
(NV) variable resistors with three monitors consists of
two 50kΩ or two 20kΩ, 256-position, linear, variable
resistors; three analog monitor inputs (MON1, MON2,
MON3); and a direct-to-digital temperature sensor. 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.
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring
Typical Operating Circuit
V_CC
4.7kΩ
2-WIRE
INTERFACE
Tx-FAULT
LOS
GROUND TO
DISABLE WRITE
PROTECT
V_CC = 3.3V
4.7kΩ
1
SDA
2
SCL
3
OUT1
4
IN1
5
OUT2
6
IN2
7
WPEN
8
GND
DS1859
16
V_CC
H1 ¹⁵
14
L1
13
H0
L0 ¹²
0.1µF
DECOUPLING
CAP
TO LASER BIAS
CONTROL
TO LASER
MODULATION
CONTROL
11 Rx POWER*
MON3
10 _{Tx POWER*}
MON2
MON1 ^{9 Tx BIAS*}
DIAGNOSTIC
INPUTS
*SATISFIES SFF-8472 COMPATIBILITY
Features
♦ SFF-8472 Compatible
♦ Five Monitored Channels (Temperature, V_CC,
MON1, MON2, MON3)
♦ Three External Analog Inputs (MON1, MON2, MON3)
That Support Internal and External Calibration
♦ Scalable Dynamic Range for External Analog Inputs
♦ Internal Direct-to-Digital Temperature Sensor
♦ Alarm and Warning Flags for All Monitored
Channels
♦ Two 50kΩ or Two 20kΩ, Linear, 256-Position,
Nonvolatile Temperature-Controlled Variable
Resistors
♦ Resistor Settings Changeable Every 2°C
♦ Access to Monitoring and ID Information
Configurable with Separate Device Addresses
♦ 2-Wire Serial Interface
♦ Two Buffers with TTL/CMOS-Compatible Inputs and
Open-Drain Outputs
♦ Operates from a 3.3V or 5V Supply
♦ Operating Temperature Range of -40°C to +95°C
Ordering Information
PART
DS1859E-050
DS1859E-020
RESISTANCE
50kΩ
20kΩ
PIN-PACKAGE
16 TSSOP
16 TSSOP
DS1859E-050/T&R
50kΩ
16 TSSOP
(Tape-and-Reel)
DS1859E-020/T&R
20kΩ
16 TSSOP
(Tape-and-Reel)
DS1859B-050
DS1859B-020
50kΩ
20kΩ
16-Ball CSBGA
16-Ball CSBGA
Pin Configurations
TOP VIEW
A _IN1
SCL VCC
H1
B _{OUT2 SDA}
H0
L1
C _{WPEN IN2 OUT1 MON3}
D GND L0 MON1 _MON2
1
2
3
4
CSBGA (4mm x 4mm)
1.0mm PITCH
1 SDA
2 SCL
3 OUT1
4 IN1
5 OUT2
6 IN2
7 WPEN
8 GND
V_CC 16
H1 15
L1 14
DS1859
H0 13
L0 12
MON3 11
MON2 10
MON1 ₉
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.