SY88347DL

The SY88347DL low-power limiting post amplifier is designed for use in fiber-optic receivers. The device 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 SY88347DL quantizes these signals and outputs PECL-level waveforms.

The SY88347DL operates from a single +3.3V power supply, over temperatures ranging from 40oC to +85oC. With its wide bandwidth and high gain, signals with data rates up to 3.2Gbps, and as small as 5mVPP, can be amplified to drive devices with PECL inputs.

The SY88347DL generates a high-gain loss-of-signal (LOS) open-collector TTL output. The LOS function has a high-gain input stage for increased sensitivity. A programmable loss-of-signal level set pin (LOSLVL) sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold sets by LOSLVL and de-asserts low otherwise. The enable bar input (/EN) de-asserts the true output signal without removing the input signal. The LOS output can be fed back to the /EN input to maintain output stability under a loss-of-signal condition. Typically, 3.3dB LOS hysteresis is provided to prevent chattering.Datasheet and support documentation can be found on Micrel's web site at: www.micrel.com.