Product category: Analogue and Mixed Signal ICs
News Release from: Maxim Integrated Products | Subject: DS1841
Edited by the Electronicstalk Editorial Team on 08 February 2008
Resistor smoothes out photodiode
performance
I2C-controlled 128-position digital resistor uses a logarithmic scale specifically designed to linearise the control of avalanche photodiode voltages in fibre optic modules.
The DS1841 is a temperature-compensated resistor optimised for avalanche photodiode (APD) voltage control This I2C-controlled 128-position digital resistor uses a logarithmic scale specifically designed to linearise the control of APD voltages in fibre optic modules
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Every 2K, an internal temperature sensor and analogue-to-digital convertor (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 I2C bus for other control/monitoring purposes.
The robust, predictable operation of the DS1841 makes it ideal for use in fibre optic modules that require a temperature-controlled voltage output.
The DS1841 is fully specified over the -40 to +100C operating temperature range, and is packaged in a tiny, 3 x 3mm, 10-pin TDFN.
Pricing begins at US $0.68 (10,000-up).
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