DS1856B-020

Digital Potentiometers Overview

The DS1856B-020 is a dual, temperature-controlled, nonvolatile variable resistor IC manufactured by Analog Devices Inc./Maxim Integrated. It integrates two 256-position linear variable resistors with three analog monitor inputs and a direct-to-digital temperature sensor. The device allows for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. Resistor settings are stored in EEPROM memory and accessed via a 2-wire serial bus. It operates from a 3.3V or 5V supply within an operating temperature range of -40°C to +95°C.

Digital Potentiometers Feature Summary

• Dual 256-position linear variable resistors with nonvolatile storage
• Integrated direct-to-digital temperature sensor and three external analog monitor inputs (MON1, MON2, MON3)
• Scalable dynamic range for external analog inputs with internal and external calibration support
• 2-Wire serial interface compatible with SFF-8472 standards

Digital Potentiometers Applications

• Setting and temperature-compensating bias voltages and currents in control applications
• SFF-8472 compliant optical module monitoring and control
• Temperature-controlled resistor circuits requiring nonvolatile adjustment

Digital Potentiometers Part Context

The DS1856B-020 belongs to the DS1856 family of dual, temperature-controlled resistors. This series is designed for applications requiring precise, nonvolatile resistance adjustment that adapts to temperature changes. The 'B' suffix typically denotes specific package or revision characteristics within the Maxim Integrated portfolio, often associated with CSBGA packaging as seen in related models like the DS1856B-050.

Digital Potentiometers Replacement Considerations

When replacing the DS1856B-020, verify compatibility with the 2-wire serial interface and ensure the substitute supports dual 256-position nonvolatile resistors. Check if the alternative component offers similar monitor channels and temperature compensation features required for the specific application.