MICROCHIP SY88432LMG-TR

The SY88432L is a low power transceiver device that integrates a 4.25Gbps FP/DFB laser diode driver with a wide-sensitivity limiting post amplifier. This low power device is designed for use in fiber-optic optical modules for multi-rate applications up to 4.25Gbps. The SY88432L transmitter section can output up to 60mA of modulation current with fast rise and fall times and is designed to be AC-coupled to the laser. The transmitter output stage incorporates a transmit disable feature and integrated 50Ω input impedance referenced to VCC. The receiver section’s limiting post amplifier connects to a typical trans-impedance amplifier (TIA) to amplify the incoming weak signal from the ROSA and outputs normalized received data in CML format at the output. The receiver offers a wide LOS (Loss Of Signal) Assert range between 8mVPP to 40mVPP differential. A programmable loss-of-signal level set pin (LOSLVL) sets the sensitivity of the input amplitude detection. The LOS or SD (signal-detect) is user selectable and the LOS/SD signal can be fed back to the JAM input to implement the SQUELCH function that maintains output stability under a loss-of-signal condition. The receiver input should be AC-coupled. The SY88432L interfaces with Micrel’s highly advanced optical module controller MIC3003 as an easy-to-use chipset solution for CSFP/SFP/CSFF/SFF optical module applications. The MIC3003 allows for both modulation and bias current control, with automatic power control (APC) and temperature compensation. The SY88432L operates on a single 3.3V power supply and is available in a 24 lead, 4x4mm QFN package.

• Multi-rate operation up to 4.25Gbps
• Single, wide range power supply: 3.3V±10%
• Industrial temp range: -40°C to +85°C
• MIC3003 compatible
• Modulation current up to 60mA
• AC coupled laser diode modulation
• Voltage controlled modulation current
• Rise/Fall times 65ps (typical)
• TX Disable with internal 75kΩ pull down resistor
• Integrated 50Ω input impedance to VCC
• Wide differential input range (10mVpp - 1800mVpp)
• Programmable LOS level (LOSLVL) sensitivity
• Wide LOS Assert range (8mVpp - 40mVpp)
• With 3.5dB typical electrical hysteresis
• Selectable LOS or SD output
• TTL compatible JAM input with internal pull up
• Low-noise CML data outputs with integrated 50Ω termination impedance
• Rise/Fall times 60ps (typical)
• Low-noise CML data inputs with integrated 50Ω termination impedance to internal reference VREF

• Gigabit Ethernet
• Fibre Channel – 1FC, 2FC, 4FC
• SONET OC3/12/24/48 and with FEC
• SDH STM1/4/8/16 and with FEC