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DS1841：Temperature-Controlled, NV, I²C, Logarithmic Resistor

Industry's Only Temperature-Compensated Resistor Optimized for APD Bias in Fiber Optic Modules

The DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digital resistor that features an on-chip temperature sensor and associated analog-to-digital converter (ADC). The integrated temperature sensor indexes a 72-byte NV lookup table (LUT) encompassing a temperature range from -40°C to +100°C. The LUT output can drive the resistor directly or be added to an NV initial-value register (IVR) to drive the resistor. This flexible LUT-based architecture allows the DS1841 to provide a temperature-compensated resistor output with arbitrary slope. Programming is accomplished by an I²C-compatible interface, which can operate at speeds of up to 400kHz.

Key Features 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor with a 3.6kΩ Fixed Resistor 128 Wiper Tap Points On-Chip Temperature Sensor and ADC 72-Byte Lookup Table (LUT) I²C-Compatible Serial Interface Address Pins Allow Up to Four DS1841s to Share the Same I²C Bus Digital Supply of 2.7V to 5.5V -40°C to +100°C Operating Range 3mm x 3mm, 10-Pin TDFN Package

DS1841: Typical Operating Circuit Applications/Uses Instrumentation and Industrial Controls Linear and Nonlinear Compensation Mechanical Potentiometer Replacement Optical Transceivers

DataSheet

Parametrics

Quality and Environmental Data

• DS1841.pdf

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