3.3V/5V 3.2Gbps CML SY88773V Micrel, Inc. LOW-POWER LIMITING POST SY88773V AMPLIFIER WITH TTL LOS DESCRIPTION FEATURES Multi-rate up to 3.2Gbps operation The SY88773V low-power, limiting post amplifier is designed for use in fiber optic receivers. The device connects Wide gain-bandwidth product to typical transimpedance amplifiers (TIAs). The linear signal 38dB differential gain output from TIAs can contain significant amounts of noise 2GHz 3dB bandwidth and may vary in amplitude over time. The SY88773V quantizes these signals and outputs typically 800mV PP Low noise 50 CML data outputs voltage-limited waveforms. 800mV output swing PP The SY88773V operates from a single +3.3V 10% or +5V 10% power supply, over an industrial temperature 60ps edge rates range of 40C to +85C. With its wide bandwidth and high 5ps typ. random jitter (RMS) gain, signals with data rates up to 3.2Gbps and as small as 15ps typ. deterministic jitter 10mV can be amplified to drive devices with CML inputs (PP) pp or AC-coupled PECL inputs. Chatter-free, Loss-of-Signal (LOS) output The SY88773V incorporates a loss-of-signal (LOS), open- 4.6dB electrical hysteresis collector TTL output with internal 4.75k pull-up resistor. A OC-TTL output with internal 4.75k pull-up programmable, loss-of-signal level set pin (LOSLVL) sets resistor the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by Programmable LOS sensitivity using single external LOSLVL and de-asserts low otherwise. LOS can be fed resistor back to the enable (/EN) input to maintain output stability Integrated input bias reference under a loss-of-signal condition. /EN de-asserts the true output signal without removing the input signal. Typically TTL /EN input allows feedback from LOS 4.6dB LOS hysteresis is provided to prevent chattering. Wide operating range Please see Micrels website at www.micrel.com for a Single 3.3V 10% or 5V 10% power supply complete selection of optical module ICs. The following table summarizes the differences between devices in Micrels 40C to +85C industrial temperature range latest family of Limiting Amplifiers. Available in tiny 10-pin EPAD-MSOP and All support documentation can be found on Micrels web 16-pin MLF packages site at www.micrel.com. Integrated 50 LOS Active LOW APPLICATIONS Part Number Input Termination or SD or HIGH Enable SY88773V No LOS LOW 1.25Gbps and 2.5Gbps Gigabit Ethernet SY88823V No SD HIGH 1.062Gbps and 2.125Gbps Fibre Channel SY88843V Yes SD HIGH 155Mbps, 622Gbps, 1.25Gbps, and 2.5Gbps SONET/ SDH SY88973V Yes LOS LOW Gigabit interface converter (GBIC) Table 1. Limiting Amplifiers Selection Guide Small form factor (SFF) and small form factor TYPICAL PERFORMANCE pluggable (SFP) transceivers Parallel 10G Ethernet 3.3V, 25C, 10mV Input pp 31 3.2Gbps 2 1 PRBS, R = 50 to V LOAD CC High-gain line driver and line receiver TIME (50ps/div.) Micro LeadFrame and MLF are trademarks of Amkor Technology Rev.: C Amendment: /0 M9999-110905 1 Issue Date: November 2005 hbwhelp micrel.com or (408) 955-1690 Output Swing (75mV/div.)SY88773V Micrel, Inc. FUNCTIONAL BLOCK DIAGRAM VCC DOUT DIN Limiting CML Amplifer Buffer /DOUT /DIN VCC 25k TTL /EN REF Buffer REF Generator Level VCC Detect 2.8k 4.75k OC-TTL LOS Buffer LOSLVL GND M9999-110905 2 hbwhelp micrel.com or (408) 955-1690