SY88403BL 3.3V 4.25Gbps CML Low-Power Limiting Post Amplifier with TTL LOS General Description Features The SY88403BL is a low-power limiting post amplifier Multi-rate up to 4.25Gbps operation optimized for copper applications. The device 5mV input sensitivity PP connects to typical transimpedance amplifiers (TIAs). Low noise 50 CML data outputs The linear signal output from TIAs can contain 800mV output swing pp significant amounts of noise and may vary in amplitude over time. The SY88403BL quantizes these 60ps edge rates signals and outputs typically 800mV voltage-limited PP 1ps typ. random jitter RMS waveforms. 10ps typ. deterministic jitter PP The SY88403BL operates from a single +3.3V 10% Chatter-free Loss-of-Signal (LOS) output power supply, over an industrial temperature range of 40C to +85C. With its wide bandwidth and high 3.5dB electrical hysteresis gain, signals with data rates up to 4.25Gbps and as OC-TTL output with internal 4.75k pull-up small as 5mV can be amplified to drive devices with PP resistor CML inputs or AC-coupled PECL inputs. Programmable LOS sensitivity using single The SY88403BL incorporates a loss-of-signal (LOS) external resistor open-collector TTL output with internal 4.75k pull-up Internal 50 data input termination resistor. A programmable loss-of-signal level set pin TTL /EN input allows feedback from LOS (LOSLVL) sets the sensitivity of the input amplitude Wide operating range: detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts Single 3.3V 10% power supply low otherwise. LOS can be fed back to the enable bar Industrial temperature range: 40C to +85C (/EN) input to maintain output stability under a loss of Available in a 10-pin EPAD-MSOP and 16-pin QFN signal condition. /EN de-asserts the true output signal package without removing the input signal. Typically, 3.5dB LOS hysteresis is provided to prevent chattering. Applications All support documentation can be found on Micrels 1.062Gbps, 2.125Gbps and 4.25Gbps Fibre web site at: www.micrel.com. Channel Cable driver Typical Performance Small form factor (SFF) and small form factor pluggable (SFP) transceivers High-gain line driver and line receiver Markets Copper interconnect Datacom and telecom Storage area network (SAN) Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. SY88403BL Typical Application Functional Block Diagram M9999-111808-F November 2008 2 hbwhelp micrel.com or (408) 955-1690