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Maxim photodiode supply protects APD during breakdown

Posted: 02 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max1932? apd bias supply? supply ic? apd protection id?

The MAX1932 avalanche photodiode (APD) bias supply from Maxim Integrated Products protects APD devices during avalanche breakdown through an accurate, high-side current sensing, and improves the reliability of optical networks and modules.

The 4-by-4mm, 12-pin QFN device employs a constant frequency voltage-mode PWM scheme to generate a low-noise output. Output ripple can be reduced to <1mW by an optional in-loop RC or LC post-filtering circuit without sacrificing output accuracy. Output voltage can be set from 4.5V to 90V while operating from a 3.3V or 5V input bus.

It also integrates a high-accuracy reference and precision error amplifier. An output voltage accuracy of 0.6 percent can be achieved over the 00C to 850C temperature range. The output voltage can be set through a conventional resistive feedback divider, an internal 8-bit SPI-compatible DAC, or an external DAC.

The avalanche breakdown of the APD is indicated through a logic signal, which can be used by external circuits to optimize bias point for highest gain.

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