SY88933VKG

Overview

The SY88933VKG is a low-power limiting post amplifier manufactured by Microchip Technology, housed in a 10-pin MSOP package. It operates from a single +3.3V or +5V power supply within an ambient temperature range of –40°C to +85°C. The device supports data rates up to 1.25Gbps and amplifies input signals as small as 5mVp-p to drive PECL inputs. Key electrical parameters include a differential voltage gain of 38dB, a 3dB bandwidth of 1GHz, and a typical power supply current of 42mA.

Feature Summary

• Provides high-sensitivity amplification for fiber-optic receiver applications by quantizing noisy linear signals from transimpedance amplifiers into PECL level waveforms.
• Features a programmable signal-detect threshold via the SDLVL pin, enabling customizable sensitivity for input amplitude detection.
• Generates a chatter-free open-collector TTL signal-detect output with internal pull-up resistor and built-in hysteresis to prevent false triggering.

Applications

• 1.25Gbps Ethernet systems
• 1.55Mbps and 622Mbps SONET/SDH networks
• 531Mbps and 1062Mbps Fibre Channel interfaces
• Gigabit interface converters

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm that the specific ordering suffix matches the required industrial temperature range and lead finish specifications. Ensure compatibility with existing PCB footprints and validate signal integrity requirements against datasheet AC characteristics before final procurement decisions.

Selection Notes

Select this component when designing high-gain line receivers requiring precise signal quantization. Consider the 10-pin MSOP package constraints for board layout. Evaluate the need for external termination resistors for PECL outputs and verify that the programmable signal-detect threshold aligns with the expected input signal amplitudes from the upstream transimpedance amplifier.

Part Context

This part belongs to the SY88933 series of limiting post amplifiers designed for optical networking. It serves as a critical interface between the analog front-end and digital logic, converting varying amplitude signals into standardized logic levels. The device integrates both signal amplification and status monitoring capabilities within a compact form factor suitable for dense circuit board designs.

Replacement Considerations

SY88933VKC

FAQ

How is the signal-detect threshold configured?

The threshold is set using the SDLVL pin by connecting an external resistor between VCC and SDLVL to create a voltage divider with the internal VREF.

What is the purpose of the EN input?

The EN input allows the true data output to be deasserted without removing the input signal, providing control over the output state.