Maxim's new DS1841 is a temperature-compensated resistor optimised for avalanche photodiode (APD) voltage control. This I²C-controlled, 128-position digital resistor utilises a logarithmic scale specifically designed to linearise the control of APD voltages in fibre-optic modules.
Every 2°C, an internal temperature sensor and analog-to-digital converter (ADC) update the digital resistor's wiper position based on the temperature and the value corresponding to that temperature in its on-chip, 72-Byte EEPROM lookup table. Both the temperature and supply voltage can be read on the I²C bus for other control/monitoring purposes. The robust, predictable operation makes the IC ideal for use in fibre-optic modules that require a temperature-controlled voltage output.
The DS1841 is fully specified over the -40 to +100°C operating temperature range, and is packaged in a 3 x 3 mm, 10-pin TDFN.
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