Maxim Integrated DS1857E-050

Description
The DS1857 is a dual temperature-controlled nonvolatile (NV) variable resistor with external temperature input and monitors. It consists of two 50kΩ, 256-position linear variable resistors, two analog monitor inputs (MON1, MON2), and an external temperature sensor input. The device provides a method for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus.

Features
Four total monitored channels (temperature, Vcc, MON1, MON2)
Two external analog inputs (MON1, MON2)
Interface to external temperature sensor (LM50)
Two 50kΩ, 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
Resistor disable (open-circuit) function
2-wire serial interface
Three address lines for multiple devices
Operates from a 3.3V or 5V supply

Applications
SFF-8472 compatible optical transceivers
Optical transponders
Instrumentation and industrial controls
RF power amps
Diagnostic monitoring