SY88403BLMG

Special Purpose Amplifiers Overview

The SY88403BLMG is a low-power limiting post amplifier optimized for copper applications, operating from a single +3.3V ±10% power supply across an industrial temperature range of –40°C to +85°C. It supports multi-rate data transmission up to 4.25Gbps with an input sensitivity as low as 5mVpp. The device features internally terminated 50Ω differential CML inputs and outputs that typically generate 800mVpp voltage-limited waveforms. Key electrical characteristics include a typical differential voltage gain of 38dB, 60ps edge rates, and approximately 1psRMS random jitter.

Special Purpose Amplifiers Feature Summary

• Integrates a chatter-free loss-of-signal (LOS) open-collector TTL output with internal pull-up resistor
• Features programmable LOS sensitivity via a single external resistor connected to the LOSLVL pin
• Includes internal 50Ω data input termination to simplify upstream interface connections
• Provides TTL /EN input capability to accept feedback from the LOS signal for output stability

Special Purpose Amplifiers Applications

• Fibre Channel networks at 1.062Gbps, 2.125Gbps, and 4.25Gbps
• Small form factor pluggable (SFP) transceivers
• Cable driver circuits
• High-gain line receiver designs

Special Purpose Amplifiers Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches the 16-pin QFN configuration and ensure lead finish corresponds to NiPdAu Pb-Free standards. Validate RoHS compliance status prior to integration into final assemblies.

Special Purpose Amplifiers Selection Notes

Select this component when designing copper interconnects requiring high sensitivity amplification for signals down to 5mVpp. Ensure the application environment remains within the specified -40°C to +85°C operating range. Verify that downstream devices can accommodate standard CML or AC-coupled PECL input requirements driven by the amplifier.

Special Purpose Amplifiers Part Context

This part belongs to the SY88403 series of limiting post amplifiers manufactured originally by Micrel, now Microchip Technology. It serves as a specialized linear amplifier IC designed to quantize noisy linear signals from transimpedance amplifiers. The device is specifically engineered to drive digital logic inputs in high-speed data communication systems.

Special Purpose Amplifiers Replacement Considerations

SY88403BLEY

Special Purpose Amplifiers FAQ

How is the Loss-of-Signal threshold configured?

The LOS threshold is set using a single external resistor connected between the VCC supply and the LOSLVL pin. This resistor creates a voltage divider that determines the input amplitude sensitivity.

What is the function of the /EN input?

The /EN input allows the LOS output to be fed back to maintain output stability during a loss of signal condition. Asserting this input de-asserts the true data output without removing the input signal.

Does the device require external input termination resistors?

No, the SY88403BLMG incorporates internal 50Ω data input termination to REF, eliminating the need for external termination resistors on the DIN and /DIN pins.