The SY88403BL is a low-power limiting post amplifier optimized for copper applications. The device connects to typical transimpedance amplifiers (TIAs). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88403BL quantizes these signals and outputs typically 800mV PP voltage-limited waveforms.

The SY88403BL operates from a single +3.3V ±10% power supply, over an industrial temperature range of –40°C to +85°C. With its wide bandwidth and high gain, signals with data rates up to 4.25Gbps and as small as 20mV PP can be amplified to drive devices with CML inputs or AC-coupled PECL inputs.

The SY88403BL incorporates a loss-of-signal (LOS) open-collector TTL output with internal 4.75k Ω pull-up resistor. 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. LOS can be fed back to the enable bar (/EN) input to maintain output stability under a loss of signal condition. /EN de-asserts the true output signal without removing the input signal. Typically 3.5dB LOS hysteresis is provided to prevent chattering.

All support documentation can be found on Micrel’s web site at: www.micrel.com.

• Multi-rate up to 4.25Gbps operation
• 20mV PP input sensitivity
• Low noise 50Ω CML data outputs
  • – 800mV pp output swing
  • – 60ps edge rates
  • – 1ps RMS typ. random jitter
  • – 10ps PP typ. deterministic jitter
• Chatter-free Loss-of-Signal (LOS) output
  • – 3.5dB electrical hysteresis
  • – OC-TTL output with internal 4.75kΩ pull-up resistor
• Programmable LOS sensitivity using single external resistor
• Internal 50Ω data input termination
• TTL /EN input allows feedback from LOS
• Wide operating range:
  • ­­– Single 3.3V ±10% power supply
  • – Industrial temperature range: –40°C to +85°C
• Available in a 10-pin EPAD-MSOP and 16-pin MLF™ package

Note:

1. Contact factory for die availability. Dice are guaranteed at T A = 25°C, DC Electricals only.
2. Tape and Reel.

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