DS1859B-050

Digital Potentiometers Overview

The DS1859B-050 is a dual, temperature-controlled, nonvolatile variable resistor with integrated monitoring capabilities. It contains two 50kΩ linear resistors with 256 positions and three external analog monitor inputs (MON1, MON2, MON3). An internal direct-to-digital temperature sensor provides thermal data. The device operates on a 2-wire serial interface and supports supply voltages from 2.85V to 5.5V. Resistor settings are stored in EEPROM and can be adjusted every 2°C over the operating range of -40°C to +95°C.

Digital Potentiometers Feature Summary

• Dual 50kΩ, 256-position linear variable resistors with nonvolatile memory
• Internal direct-to-digital temperature sensor and three external analog monitors
• SFF-8472 compatible with alarm and warning flags for all monitored channels
• Configurable via 2-wire serial bus with separate main and auxiliary device addresses

Digital Potentiometers Applications

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

Digital Potentiometers Procurement Notes

Verify the specific package type and lead-free status (+ suffix) against the manufacturer's current production status. Confirm that the 50kΩ resistance variant matches the design requirements. Ensure the 16-pin CSBGA footprint is compatible with the PCB layout before ordering.

Digital Potentiometers Selection Notes

Select the DS1859B-050 when dual 50kΩ temperature-compensated resistors are required alongside voltage and thermal monitoring. The device supports both standard and fast-mode I2C communication. Consider the DS1859B-020 if a 20kΩ resistance value is needed instead. Verify write protection requirements using the WPEN pin configuration.

Digital Potentiometers Part Context

This component belongs to the DS1859 family of dual temperature-controlled resistors. The 'B' designation indicates the 50kΩ version, while the '+'' denotes a lead-free package. It is designed for applications requiring precise bias control and diagnostic feedback in optical networking equipment.

Digital Potentiometers Replacement Considerations

The DS1859B-020 serves as a functional substitute if a 20kΩ resistance value is acceptable. No other direct cross-model replacements are documented in the provided datasheet.