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Microchip Technology

Microchip Technology Limiting Post Amplifier Part #SY88343BLEY | IC | DEX

Microchip Technology Limiting Post Amplifier Part #SY88343BLEY | IC | DEX

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Microchip Technology Limiting Post Amplifier Part #SY88343BLEY

The SY88343BL low-power limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers (TIAs) that are AC-coupled. The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88343BL quantizes these signals and outputs CML-level waveforms. The SY88343BL operates from a single +3.3V power supply, over temperatures ranging from –40°C to +85°C. With its wide bandwidth and high gain, signals with data rates up to 3.2 Gbps and as small as 5 mVPP can be amplified to drive devices with CML inputs or AC-coupled CML/PECL inputs. The SY88343BL generates a high-gain loss-of-signal (LOS) open-collector TTL output. The LOS function has a high gain input stage for increased sensitivity. A programmable loss-of-signal level set pin (LOSLVL) sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. The enable bar input (/EN) de-asserts the true output signal without removing the input signal. The LOS output can be fed back to the /EN input to maintain output stability under a loss-of-signal condition. Typically, 3.5 dB LOS hysteresis is provided to prevent chattering.



  • Single 3.3V Power Supply
  • DC to 3.2 Gbps Operation
  • Low-Noise CML Data Outputs
  • High Gain LOS
  • Chatter-Free Open-Collector TTL Loss-of-Signal (LOS) Output with Internal 4.75 kΩ Pull-Up Resistor
  • TTL /EN Input
  • Programmable LOS Level Set (LOSLVL)
  • Ideal for Multi-Rate Applications



  • Gigabit Ethernet
  • Fibre Channel
  • OC-3 and OC-12/24 SONET/SDH
  • High-Gain Line Driver and Line Receiver




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