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Temperature-compensated resistor optimized for APD biasing

Sunnyvale, Calif.—Maxim Integrated Products has introduced the DS1841 temperature-compensated resistor optimized for avalanche photodiode (APD) voltage control.

The I²C-controlled, 128-position digital resistor uses a logarithmic scale specifically designed to linearize the control of APD voltages in fiber optic modules.

Every 2°C, an internal temperature sensor and A/D converter 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 I&sup2C bus for other control/monitoring purposes. The 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 -40°C to +100°C operating temperature range, and is packaged in a tiny, 3mm x 3mm, 10-pin TDFN.

Pricing: Begins at $0.68 (10,000-up, FOB USA).
Availability: Now.
Datasheet: DS1841

Maxim Integrated Products, 1-800-998-8800, www.maxim-ic.com

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