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

Temperature-Compensated Digital Resistor Optimized for APD Bias Control

Note to Editor: The DS1841 is a 128-position digital resistor with an on-chip temperature sensor, ADC, and EEPROM lookup table. This device achieves a greater level of control and precision than current solutions, which tend to provide fine control at low voltages but poor control at critical high voltages. To enable this performance, the digital resistor provides nonlinear step sizes between positions to ensure a linear voltage output response when used with a DC-DC converter. The DS1841 is ideal for fiber optic modules that require a temperature-controlled voltage output.

SUNNYVALE, CA—February 7, 2008—Maxim Integrated Products (Pink Sheets: MXIM) introduces the DS1841 temperature-compensated resistor optimized for avalanche photodiode (APD) voltage control. This I²C-controlled, 128-position digital resistor utilizes a logarithmic scale specifically designed to linearize the control of APD voltages in fiber 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 of the DS1841 makes it ideal 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).

Maxim Integrated Products, a two billion dollar company, designs and manufactures ICs for analog and mixed-signal applications. The company's broad portfolio of 27 product lines is among the industry's deepest, with over 5400 products.