The MAX3963 is a low-noise transimpedance preamplifier for FDDI and 155Mbps ATM optical receivers. The MAX3963's dynamic range is optimized for use in multimode LED-based applications.
The preamplifier converts a small photodiode current to a differential voltage, with typical transimpedance of 22 kilohms. Input-referred noise of only 21nA allows detection of signals as small as 267nA, while pulse-width distortion is only 85ps with a 60µA input signal. In a 1300nm multimode receiver, with responsivity of 0.7A/W, the MAX3963's dynamic range spans from
-36dBm to -13.7dBm. The circuit operates from a single +5V supply, and typically consumes only 60mW power.
The MAX3963 die includes a filter connection, which provides positive bias for the photodiode through a 1 kilohm resistor to VCC. This feature, combined with the small die size, allows the MAX3963 to fit easily into a TO-style package with a photodiode.
The differential outputs are back terminated with 60Ω per side, allowing the easy use of filters to improve sensitivity.
The MAX3963 is designed to be used with the MAX3964 limiting amplifier IC. It is available in an 8-pin SO package and as dice.
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