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PX6429 12 x 10 Gb/s TIA/LA Optical Receiver Product Brief
April 2005 Features
* 12x10 Gb/s Integrated Transimpedance and Limiting Amplifier for parallel channel optical receiver applications Channels support data rates up to 10.7 Gb/s enabling various 120 Gb/s parallel PMD applications Global signal detect senses quiescent photocurrent with adjustable threshold and hysteresis Individual channel signal detect senses input signal strength (0MA) with adjustable sensitivity and hysteresis 20 uApp receiver sensitivity for 10-12 BER 180 mW per channel power dissipation for >500 mV differential output swing Serial digital interface for controlling channel power down, signal detect sensitivity, output amplitude and global signal detect Differential back-terminated outputs Flip-chip or direct wire-bond attach to photodiode 250-micron channel pitch matches optical ribbon fiber and array photodiodes
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Description The growing use of the Internet has created increasingly higher demand for multi-Gb/s I/O performance. The demand for 100+ Gb/s WAN bandwidth fuels the growth of short-reach 120 Gb/s infrastructures within high-end telco and datacom routers, switches, servers and other proprietary chassis-to-chassis links. The Zarlink PX6429 120 GB/s TIA/LA Receiver is a 12channel TIA/LA optical receiver designed for various 12x10 Gb/s, 10 Gb/s parallel optics and CWDM PMD applications. It consists of a DC coupled transimpedance amplifier and an AC coupled differential limiting amplifier. The transimpedance amplifier achieves a nominal 8 GHz bandwidth over a wide range of photodiode input capacitance. Excellent channel-to-channel isolation ensures data integrity at the receiver sensitivity limits. A global signal detect circuit provides the photodiode reverse bias voltage supply and senses average photocurrent supplied to the photodiode array. The transimpedance amplifier is AC-coupled internally to a high-gain, high-bandwidth differential limiting amplifier. The limiting amplifier provides a differential back-terminated CML output that can be used to drive 10 Gb/s per channel transceivers or other CML compatible clock and data recovery circuits. The limiting amplifier features an adjustable signal detect circuit that senses optical modulation amplitude (OMA) to provide a received signal indication for each channel.
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Applications
* * Proprietary 120Gb/s intra-system parallel optics Multi-channel 10GbE, 10GFC, OC-192 VSR optical links
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Zarlink Semiconductor Inc.
PX6429
Product Brief
Figure 1: Typical optical to electrical differential data eye from the Zarlink PX6429 IC using a commercially available photodiode at 10 Gb/s with a PRBS31 data pattern.
Figure 2: Application Block Diagram
PX6419
50 Ohms 50 Ohms 50 Ohms 50 Ohms LD_IN0_P LD_IN0_N LD_IN1_P LD_IN1_N GND GND LD_OUT1 LD_OUT0
TX Data
50 Ohms 50 Ohms MICRO CONTROLLER 2-Wire Interface DATA DATA CLK STB 4-Wire Interface LD_IN11_P LD_IN11_N GND D_IN D_OUT CLK STB LD _OUT11
DATA CLK
Optical Fiber
OPTIONAL MICRO CONTROLLER 2-Wire Interface DATA DATA CLK STB
4-Wire Interface
PX6429
D_IN D_OUT CLK STB AMPOUT0_P AMPOUT0_N TIA_IN0 AMPOUT1_P AMPOUT1_N TIA_IN1 DET_BIAS DET_BIAS
DATA CLK
50 Ohms 50 Ohms 50 Ohms 50 Ohms
RX Data
50 Ohms 50 Ohms
AMPOUT11_P AMPOUT 11_N
DET_BIAS TIA_IN11
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Zarlink Semiconductor Inc.
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TECHNICAL DOCUMENTATION - NOT FOR RESALE

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