SY88053ALMG

Special Purpose Amplifiers Overview

The SY88053ALMG is a limiting post amplifier designed for fiber-optic receivers operating up to 12.5Gbps. It features a programmable decision threshold for BER optimization in noisy WDM environments with EDFAs or Raman amplifiers. The device connects to typical transimpedance amplifiers (TIAs) and operates from a single +3.3V supply over temperatures ranging from –40°C to +85°C. It detects and amplifies signals as low as 15mVpp, generates a Loss-of-Signal open-collector TTL output, and includes an enable input. The component is available in a 16-pin MLF package.

Special Purpose Amplifiers Feature Summary

• Programmable decision threshold control allows offset compensation and Bit Error Rate optimization in noisy applications such as WDM systems using optical amplifiers.
• Generates a Loss-of-Signal open-collector TTL output with a programmable sensitivity level set by an external resistor.
• Features a TTL enable input that de-asserts the true output signal without removing the input signal, supporting squelch functionality.
• Provides low-noise CML data outputs with internal termination.

Special Purpose Amplifiers Applications

• WDM Systems
• 10xGigabit Ethernet and 8xFibre Channel
• SONET/SDH: OC192 – STM64
• Low-gain TIA interface

Special Purpose Amplifiers Procurement Notes

Verify the specific ordering suffix required for your packaging needs, as the SY88053ALMG is available in tube packaging while the SY88053ALMGTR variant utilizes tape and reel. Confirm current availability status as distribution channels may list this component as obsolete or discontinued depending on the source date. Ensure compatibility with the 16-pin MLF footprint during procurement planning.

Special Purpose Amplifiers Selection Notes

Select this component when designing fiber-optic receivers requiring operation at data rates up to 12.5Gbps with high sensitivity to small input signals. It is specifically suited for WDM applications where amplified spontaneous emission noise requires adjustable decision thresholds to optimize performance. Ensure the design accommodates the single 3.3V power supply requirement and the thermal characteristics of the MLF package.

Special Purpose Amplifiers Part Context

This component belongs to the Micrel SY88053 series of limiting post amplifiers. Originally manufactured by Micrel, Inc., the product line was acquired by Microchip Technology. The SY88053ALMG represents the industrial temperature range version housed in a 16-pin MLF package, distinct from other variants like the SY88353BL which targets different speed grades.

Special Purpose Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not identified in the provided documentation. Designers should consult official Microchip or Micrel resources for cross-reference information regarding obsolescence management.

Special Purpose Amplifiers FAQ

How is the decision threshold adjusted?

The decision threshold is adjusted by tying pin VTHN to pin VTHREF and applying a DC voltage between 0V and 2.4V to pin VTHP. This allows the signal crossing point to be moved from 20% to 80% to optimize BER.

What is the function of the LOSLVL pin?

The LOSLVL pin sets the sensitivity of the input amplitude detection for the Loss-of-Signal feature. Connecting an external resistor between VCC and this pin creates a voltage divider that determines the threshold at which the LOS output asserts.

Can the LOS output be used for squelch control?

Yes, the LOS output can be fed back to the /EN input to implement a squelch function. This maintains output stability under loss-of-signal conditions by de-asserting the true output signal.