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APD voltage control resistor has temperature compensation

Posted: 11 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:temperature compensation? resistors? APD voltage control?

DS1841

Maxim Integrated Products has introduced the DS1841 temperature-compensated resistor optimized for avalanche photodiode (APD) voltage control. This I?C-controlled, 128-position digital resistor uses a logarithmic scale specifically designed to linearize the control of APD voltages in fiber optic modules. Every two degrees Celsius, an internal temperature sensor and ADC update the digital resistor's wiper position based on the temperature and the value corresponding to that temperature in its on-chip, 72byte EEPROM lookup table. Both the temperature and supply voltage can be read on the I?C bus for other control/monitoring purposes. The robust, predictable operation of the DS1841 makes it suitable for use in fiber optic modules that require a temperature-controlled voltage output.

The DS1841 is fully specified over the -40C to 100C operating temperature range, and is packaged in a 3mm x 3mm, 10-pin TDFN. Pricing begins at 68 cents.




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