The SY84403BL is the industry's smallest limiting post amplifier ideal for compact copper and fiber optic module 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 SY84403BL quantizes these signals and outputs typically 800mVPP voltage-limited waveforms. The SY84403BL comes in a tiny 10-pin 2x2 MLF® package, which is unparalleled in the industry. It offers space savings of 55% or more over typical post amps. It 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 10mVPP can be amplified to drive devices with CML inputs or AC-coupled PECL inputs. The SY84403BL incorporates a loss-of-signal (LOS) open-collector TTL output with internal 4.75kΩ 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.

• Available in an ultra small 10-pin (2mm x 2mm) MLF® package
• Multi-rate up to 4.25Gbps operation
• 10mVPP input sensitivity
• Low noise 50Ω CML data outputs
• 800mVPP differential output swing
• 60ps edge rates
• 1psRMS typ. random jitter
• 10psPP 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
• Part of Micrel's new ultra small FOM IC family. For Laser Diode Drivers, see SY84202L or SY8