SY88933VKI

Overview

The SY88933VKI is a low-power limiting post amplifier designed for fiber-optic receivers. It operates from a single +3.3V or +5V power supply and supports data rates up to 1.25Gbps. The device features a high-sensitivity input capable of amplifying signals as small as 5mVp-p, providing typically 38dB differential voltage gain. It outputs PECL level waveforms and includes a TTL signal detect output with programmable sensitivity.

Feature Summary

• Integrates a chatter-free open-collector TTL signal detect output with an internal pull-up resistor
• Features a programmable signal-detect level set pin to adjust input amplitude detection sensitivity
• Provides typically 4.6dB hysteresis on the signal detect output to prevent chattering
• Includes an enable input that deasserts the true output signal without removing the input signal

Applications

• 1.25Gbps Ethernet systems
• SONET/SDH networks operating at 1.55Mbps and 622Mbps
• Fibre Channel applications at 531Mbps and 1062Mbps
• Gigabit interface converters
• High-gain line driver and line receiver circuits

Procurement Notes

Verify the industrial temperature range (-40°C to +85°C) matches your operational requirements. Confirm the MSOP-10 package dimensions align with your PCB layout constraints. Ensure the datasheet revision corresponds to the specific manufacturing lot for accurate electrical characteristics. Cross-reference the ordering suffix 'I' to confirm industrial grade specifications before finalizing procurement.

Selection Notes

Select this component when interfacing transimpedance amplifiers with PECL inputs in optical networking environments. The device is suitable for designs requiring a single power supply operation between 3.0V and 5.5V. Consider the 1GHz bandwidth and 38dB gain for high-speed signal conditioning. Evaluate the programmable signal detect threshold if loss-of-signal monitoring is required for system stability.

Part Context

This part belongs to the SY88933V series of limiting post amplifiers manufactured by Microchip Technology (formerly Micrel). It is specifically engineered for use in fiber-optic receivers where noise quantization and signal restoration are critical. The device connects directly to typical transimpedance amplifiers to process linear signal outputs containing significant noise.

Replacement Considerations

SY88933VKC: Commercial temperature variant with identical electrical specifications.

FAQ

How is the signal detect threshold configured?

The signal detect threshold is set using the SDLVL pin. Connecting an external resistor between VCC and SDLVL creates a voltage divider with the internal VREF, allowing programmable sensitivity for input amplitude detection.

What is the function of the EN pin?

The EN pin is a TTL input that enables the true data output when asserted high. Deasserting the EN pin disables the output signal while leaving the input signal path active, which helps maintain stability during loss of signal conditions.