Signal-conditioner chipset won’t jitterbug

Sunnyvale, Calif. — Maxim Integrated Products Inc. said its MAX3991/MAX3992, a signal-conditioner chipset for 10 Gbits/s XFP transceiver modules, provides 0.6 unit interval (UI) peak-to-peak tolerance at the receiver and only 4 mUI rms jitter generation at the transmitter.

The MAX3991 is a clock-and-data-recovery (CDR) IC with an integrated limiting amplifier for the XFP receivers. The MAX3992 is a CDR device with an integrated equalizer for the XFP transmitters. The MAX3991/MAX3992 chipset is XFI compliant, and operates from 9.95 Gbits/ to 11.1 Gbits/s.

The MAX3991 has a 7mV peak-to-peak input sensitivity at BER = 10 (-12), which allows the TIA to interface with the signal conditioner without needing an external limiting amplifier.

The MAX3992 provides 23ps edge-transition times while generating only 4 mUI rms output jitter. The MAX3992 equalizes up to 12 inches of FR4, providing a clean input signal to the laser driver. Both the MAX3991 and MAX3992 have loss-of-signal (LOS) and loss-of-lock (LOL) indicators. The chipset also incorporates a data-polarity switch function.

The MAX3991/MAX3992 operate from 0°C to +85 °C and are available in a 4mm x 4mm, 24-pin QFN package. Prices start at $15.00 (1000-up, FOB USA).

Click here for a preliminary data sheet for the MAX3991.

Readers can contact Maxim by phone at 1-800-998-8800 or visit them on the web at

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