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Micrel's new limiting post amplifier

Posted: 12 Oct 2005 ?? ?Print Version ?Bookmark and Share

Keywords:fiber-optic receiver? sy88315bl? limiting post amplifier? micrel? transimpedance amplifier?

Designed for use in fiber-optic receivers, the SY88315BL low-power limiting post amplifier from Micrel connects to typical transimpedance amplifiers (tias). The company explained that the linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88315BL quantizes these signals and outputs CML level waveforms.

The new amplifier operates from a single 3.3V +10 percent power supply, over temperatures ranging from -40C to 85C. With its wide bandwidth and high gain, signals with data rates up to 3.2Gbps and as small as 5mV P-P can be amplified to drive devices with CML inputs or AC-coupled CML/PECL inputs.

The SY88315BL generates a signal-detect (SD) open-collector TTL output. A programmable signal-detect level set pin (SD LVL) sets the sensitivity of the input amplitude detection. SD asserts high if the input amplitude rises above the threshold set by SD LVL and de-asserts low otherwise. The enable input (EN) de-asserts the true output signal without removing the input signal. The SD output can be fed back to the EN input to maintain output stability under loss-of-signal condition. Typically 3.4dB SD hysteresis is provided to prevent chattering.

The SY88315BL is available in 10-pin EPAD MSOP and 16-pin MLF package.



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