SY88843V Micrel, Inc. 3.3V/5V 3.2Gbps CML LOW-POWER SY88843V LIMITING POST AMPLIFIER w/TTL SD DESCRIPTION FEATURES Multi-rate up to 3.2Gbps operation The SY88843V 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 and may vary in amplitude over time. The SY88843V 2GHz 3dB bandwidth quantizes these signals and outputs typically 800mV PP Low noise 50 CML data outputs voltage-limited waveforms. 800mV output swing The SY88843V operates from a single +3.3V 10% or PP +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 10mVp-p can be amplified to drive devices with CML inputs PP or AC-coupled PECL inputs. Chatter-free, Signal-Detect (SD) output The SY88843V incorporates a signal detect (SD), 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 (SDLVL) sets the sensitivity of the input amplitude detection. SD asserts high resistor if the input amplitude rises above the threshold set by SDLVL Programmable SD sensitivity using single external and de-asserts low otherwise. SD can be fed back to the resistor enable (EN) input to maintain output stability under a loss Internal 50 data input termination of signal condition. EN asserts the true output signal without removing the input signal. Typically 4.6dB SD hysteresis is TTL EN input allows feedback from SD 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, 622Mbps, 1.25Gbps, and 2.5Gbps SONET/ SY88973V Yes LOS LOW SDH Table 1. Limiting Amplifiers Selection Guide Gigabit interface converter (GBIC) Small form factor (SFF) and small form factor TYPICAL PERFORMANCE pluggable (SFP) transceivers 3.3V, 25C, 10mV Input pp 31 Parallel 10G Ethernet 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.)SY88843V Micrel, Inc. FUNCTIONAL BLOCK DIAGRAM VCC DOUT DIN Limiting CML 50 Buffer Amplifer /DOUT /DIN VCC REF 25k TTL EN Buffer REF Generator Level VCC Detect 2.8k 4.75k OC-TTL SD Buffer SDLVL GND M9999-110905 2 hbwhelp micrel.com or (408) 955-1690