SY88343DL

SY88343DL 3.3V, 3.2Gbps CML Limiting Post Amplifier with High-Gain TTL Loss-of-Signal General Description The SY88343DL low-power, high-sensitivity, 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 SY88343DL quantizes these signals and outputs CML level waveforms. The SY88343DL operates from a single +3.3V power supply, over temperatures ranging from –40oC to +85oC. With its wide bandwidth, high gain, and signals with data rates up to 3.2Gbps and as small as 5mVPP can be amplified to drive devices with CML inputs or ACcoupled CML/PECL inputs. The SY88343DL generates a high-gain loss-of-signal (LOS) open-collector TTL output. This function has a high-gain input stage for increased LOS 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 set 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, 3.5dB LOS hysteresis is provided to prevent chattering. All support documentation can be found on Micrel’s web site at: www.micrel.com. Features Singl...