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New limiting post amplifier from Micrel w/ TTL signal detect

Posted: 27 Jun 2005 ?? ?Print Version ?Bookmark and Share


The SY88933AL is a low power limiting post amplifier w/ TTL signal detect from Micrel Semiconductor, which is designed for use in fiber-optic receivers and connects to typical transimpedance amplifiers (tias). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88933AL quantizes these signals and outputs PECL level waveforms.

The new amplifier operates from a single 3.3V power supply, over temperatures ranging from -40C to 85C. With its wide bandwidth and high gain, signal with data rates up to 1.25Gbps and as small as 5mVPP can be amplified to drive devices with PECL inputs.

The SY88933AL generates a high gain signal-detect (SD) open-collector TTL output. The SD function has a high gain input stage for increased sensitivity. A programmable SD level set pin (SDLVL) sets the sensitivity of the input amplitude detection. SD asserts high if the input amplitude rises above the threshold set by SDLVL and de-asserts low otherwise, explained Micrel. 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 a loss-of-signal condition. Typically, 3.4dB SD hysteresis is provided to prevent chattering.

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