The SY88343HL 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 SY88343HL quantizes these signals and outputs CML level waveforms.

The SY88343HL operates from a single +3.3V power supply, over temperatures ranging from -40°C to +85°C. With its wide bandwidth, high gain, and signals with data rates up to 3.2Gbps and as small as 4mVPP, it can be amplified to drive devices with CML/PECL inputs

The SY88343HL 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 (LOS LVL) sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOS LVL 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.

• High input sensitivity: 4mVPP
• Single 3.3V power supply
• 155Mbps to 3.2Gbps operation
• Ideal for multi-rate applications
• Low-noise CML data outputs
• High-sensitivity Loss-of-signal (LOS) detection
• Chatter-free open-collector TTL Loss-of-Signal (LOS) output with internal 4.75kΩ pull-up resistor
• TTL /EN input
• Programmable LOS level set (LOS LVL)
• Available in a tiny (3mm x 3mm) 16-pin MLF® package