SY88803VKC

Overview

The SY88803VKC is a low-power limiting post amplifier designed for fiber-optic receivers, operating from a single +3.3V or +5V supply. It supports data rates up to 155Mbps and features a differential voltage gain of 38dB with a 3dB bandwidth of 200MHz. The device accepts input signals as small as 5mVp-p and outputs PECL level waveforms. It includes a TTL Loss-of-Signal (LOS) output with programmable sensitivity via the LOSLVL pin and typically provides 4.6dB electrical hysteresis to prevent chattering.

Feature Summary

• Quantizes noisy linear signals from transimpedance amplifiers into clean PECL level waveforms
• Generates a chatter-free TTL LOS output with programmable amplitude detection threshold
• Features high-sensitivity input stage capable of detecting signals as small as 5mVp-p
• Includes an /EN input to deassert the true data output without removing the input signal

Applications

• 155Mbps SONET/SDH systems
• Small form factor transceivers
• High-gain line driver and line receiver circuits

Procurement Notes

Verify that the specific part number SY88803VKC corresponds to the commercial temperature range variant with Sn-Pb lead finish as documented in the ordering information table. Confirm package type is MSOP-10. Ensure compatibility with single 3.3V or 5V power supplies and check for required external termination resistors for PECL outputs and pullup resistor for the LOS pin during integration.

Selection Notes

Select this component when interfacing with typical transimpedance amplifiers in fiber-optic applications requiring signal quantization at 155Mbps. It is suitable for designs needing a programmable loss-of-signal threshold and stable PECL outputs. Consider the 10-pin MSOP package size for space-constrained layouts and ensure proper PCB grounding to minimize feedback from high-swing outputs.

Part Context

This device belongs to the SY88803V series of low-power limiting post amplifiers originally manufactured by Micrel, Inc., which was later acquired by Microchip Technology. The series is engineered for optical communication receivers where noise reduction and signal regeneration are critical. The VKC suffix specifically denotes the commercial temperature grade and standard lead finish options within this product family.

Replacement Considerations

SY88803VKTR

FAQ

How is the Loss-of-Signal (LOS) threshold determined?

The LOS threshold is set by applying a voltage between VCC and VREF to the LOSLVL pin. A smaller voltage difference from LOSLVL to VCC results in lower sensitivity, requiring a larger input amplitude to deassert the LOS signal.

What is the purpose of the /EN pin?

The /EN pin is a TTL input that deasserts the true data output when held high. This allows the output to be disabled without removing the input signal, which helps maintain stability under loss-of-signal conditions.

Does the device provide hysteresis for the LOS output?

Yes, the SY88803VKC provides typically 4.6dB of electrical hysteresis to prevent chattering of the LOS output when the input signal amplitude fluctuates near the detection threshold.