DS1856E-020+T&R

Digital Potentiometers Overview

The DS1856E-020+T&R is a dual, temperature-controlled, nonvolatile variable resistor IC from Analog Devices/Maxim Integrated. It integrates two 256-position linear variable resistors with 20kΩ nominal resistance, three analog monitor inputs (MON1, MON2, MON3), and an internal direct-to-digital temperature sensor. The device operates on a 2-wire serial interface with supply voltages ranging from 2.85V to 5.5V. Resistor settings are stored in EEPROM memory and can be adjusted every 2°C over the operating range of -40°C to +95°C.

Digital Potentiometers Feature Summary

• Dual 256-position linear variable resistors with 20kΩ nominal resistance
• Three external analog monitor inputs plus internal VCC and temperature monitoring
• Nonvolatile EEPROM storage for resistor settings accessible via 2-wire serial bus
• Password protection with three levels of security access

Digital Potentiometers Applications

• Optical transceivers and transponders
• Instrumentation and industrial controls
• RF power amplifier biasing
• Diagnostic monitoring systems

Digital Potentiometers Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and pin alignment upon receipt. Ensure storage conditions remain within specified limits to preserve nonvolatile memory characteristics. Check for lead-free compliance markings consistent with the '+' suffix designation.

Digital Potentiometers Selection Notes

Select this model when 20kΩ resistance values are required for both variable resistors. Verify that the system requires dual independent temperature-compensated control paths. Confirm compatibility with 2-wire serial communication protocols and available I/O voltage levels. Evaluate if the integrated monitoring features meet specific alarm threshold requirements.

Digital Potentiometers Part Context

This component belongs to the DS1856 family of dual temperature-controlled resistors. It shares architectural similarities with the DS1859 but offers a memory map compatible with the DS1852. The 'E' suffix indicates a specific resistance variant within the series, while '+T&R' denotes lead-free packaging in tape-and-reel format.

Digital Potentiometers Replacement Considerations

The DS1856B-020+ and DS1856E-020+ are functionally equivalent variants differing primarily in package type. Cross-model substitution with DS1859 series devices requires verification of memory map compatibility and address configuration settings.