OC-48/STM-16 Receiver with Clock Recovery SRC48 Product Description The SRC48 modules are receivers with internal clock recovery designed to meet or exceed the SONET/SDH optical interface requirements at OC48/STM-16 (2.488 Gb/s) data rate. Three performance versions are available which are fully compliant with Short Reach, Intermediate Reach and Long Reach specifications at 1300 nm and 1550 nm wavelength. The receiver for the Short Reach and Intermediate Reach version uses PIN photodiodes. For the Long Reach version, InGaAs avalanche photodiodes (APDs) are used to achieve high sensitivity. The Long Reach receiver features a low noise GaAs transimpedance IC with AGC capability to provide an extremely wide dynamic range. A Phase Lock Loop (PLL) circuit is included to perform the clock recovery function and resampling of the data. Both DATA and CLOCK outputs are differential signals designed to be AC-coupled into 50 ohm load. A TTL Signal Detect function which indicates loss of optical input and an analog Received Optical Power Monitor output ares also provided. All receiver modules can be operated with a single +5V supply. The operating temperature range is -40°C to +85°C for the Short Reach and Intermediate Reach version and 0°C to +70°C for the Long Reach version. All receivers are housed in a 24-pin dual-in-line metal package with fiber pigtail (single mode fiber for Long Reach version and 50/125 μm multimode fiber for Short Reach and Intermediate Reach versions). The fiber pigtail is terminated with ST, FC or SC connector. Features Fully compliant with SONET/SDH OC-48/STM-16 (2.5 Gb/s) specifications Long Reach 1310 nm & 1550 nm as well as Intermediate Reach and Short Reach Internal temperature-compensated High Voltage APD Supply (Long Reach version) -40°C to +85°C Operating Temperature (Intermediate Reach and Short Reach) 24-pin DIP metal package FC, ST, SC-connectorized fiber pigtails Differential DATA & CLOCK interface TTL SIGNAL DETECT output Received Optical Power Monitor function Single +5 V supply Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units TST - 40 + 85 °C - 40 + 85 0 + 70 Pin, max - - 5.0 dBm Supply Voltage VCC 0 + 6.0 V Input Voltage VIN 0 VCC V - - Storage Temperature Operating Case Temperature “I” option (“SR” & “IR” only) “H” option Maximum Optical Input Power (“LR” only) Lead Soldering Temperature & Time An Oplink Company TOP °C 260°C, 10 sec R3.2009.04.30 SRC48 Receiver Performance Characteristics (Over Operating Case Temperature.) Parameter Symbol Minimum Typical Maximum Units B 2.48832 - 500 ppm 2.48832 2.48832 + 500 ppm Gb/s - 20.0 - 24.0 - - 28.0 - 31.0 - - 3.0 - 1.0 - 0 2.0 - Data Rate Short & Intermediate Reach Receiver Sensitivity (10-10 BER) 1 Pmin Long Reach Short Reach (SR) Maximum Input Optical Power (10-10 BER) 1 Pmax Intermediate Reach (IR) Long Reach (LR) dBm dBm - 8.0 - - 6.0 Increasing Light Input Psd+ - - - 20.0 Decreasing Light Input Psd- - 35.0 - - Increasing Light Input Psd+ - - - 28.0 Decreasing Light Input Psd- - 42.0 - - - 0.5 1.0 - - 6 - - 0.8 - λ 1100 - 1600 nm Clock Sampling Point TCSP 150 200 250 ps Output Clock Jitter CLKJ - - 0.01 UIrms SR & IR Signal Detect Thresholds LR Signal Detect Hysteresis LR (Pin from -28 dBm to -17 dBm) Optical Power Monitor Current IPM IR & SR (Pin from -20 dBm to 0 dBm) Wavelength of Operation Jitter Tolerance & Transfer Function 1 dBm dBm dB µA/µW compliant with ITU Recommendation G.958 Specified in Average Optical Input Power and measured at 2.48832 Gb/s and 1300 nm or 1550 nm wavelength with 223-1 PRBS. Receiver Electrical Interface Parameter Supply Voltage Minimum Typical Maximum Units VCCA’ VCCD 4.75 5.0 5.25 V SR & IR Supply Current Output Voltage Swing Symbol I LR DATA 1 VPP CLOCK - 425 525 - 465 565 0.4 0.75 0.95 0.35 0.45 0.95 mA V Output HIGH Voltage (SIGNAL DETECT) VOH 2.7 - VCCD V Output LOW Voltage (SIGNAL DETECT) VOL 0 - 0.50 V 1 AC-coupled into 50 ohm load Interface Circuit 1 µH coil or ferrite bead (<0.1 ohm series resistance) +5V + 10 + 100 + 100 0.01 0.01 50 ohm line 6 0.022 23,24 50 ohm line DATAto 50 ohm load 5 13,14 15,16 0.022 50 ohm line 10 NO CONNECTION +5V 1 50 ohm line 9 0.001 0.01 3 2,4,7,8,11,12 17,18,19,20 Oplink Communications, Inc. 0.001 SRC-48 3 Kohm + 10 DATA+ to 50 ohm load 2 21 SD+ 22 SD - CLK+ to 50 ohm load CLKto 50 ohm load R3.2009.04.30 SRC48 Application Notes The receiver converts the incident optical power to a photocurrent via a high performance P-I-N photodiode (Short and Intermediate Reach version) or an avalanche photodiode (Long Reach version). The photocurrent can be monitored via the voltage drop across an external resistor connected between PM and VCC. The APD Bias Voltage is internally generated from the +5 V supply by a low noise DC-DC converter. The APD Bias Voltage is temperature compensated to ensure stable operation over the entire operating temperature range.the entire operating temperature range. Both DATA and CLOCK outputs are differential signals designed to be AC-coupled into 50 ohm load. Transmission lines are recommended for best performance. The Signal Detect circuit monitors the level of the incoming optical signal and generates a logic LOW signal at the SIGNAL DETECT+ output when insufficient photocurrent is produced. No termination resistor is required for the SIGNAL DETECT outputs. Timing Diagram Optical Power Monitor Interface Circuit VCC External Monitor Resistor (about 3 Kohm) DATA TCSP PM (Pin 3) APD/PIN Current Monitor CLOCK SRC-48 Typical Jitter Transfer Function Typical DATA output Eye Pattern Typical Jitter Tolerance Measurement Oplink Communications, Inc. 3 R3.2009.04.30 SRC48 Package Outline (Dimension in inches) 46335 Landing Pkwy Fremont, CA 94538 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: [email protected] • www.oplink.com The pigtail length from the package edge is 1.0 meter typical. Pinout Assignments PIN FUNCTION PIN FUNCTION 1 N/C (NO CONNECTION) 24 VCCA (VCC ANALOG) 2 GND 23 VCCA (VCC ANALOG) 3 PM (optical Power Monitor) 22 SD - (SIGNAL DETECT -) 4 GND 21 SD + (SIGNAL DETECT +) 5 DATA OUTPUT - 20 GND 6 DATA OUTPUT + 19 GND 7 GND 18 GND 8 GND 17 GND 9 CLK - (CLOCK OUTPUT -) 16 VCCD (VCC DIGITAL) 10 CLK - (CLOCK OUTPUT +) 15 VCCD (VCC DIGITAL) 11 GND 14 VCCD (VCC DIGITAL) 12 GND 13 VCCD (VCC DIGITAL) Related TX, RX & Transceiver Modules STX-48: OC-48/STM-16 Transmitter (24-pin DIP) SRX-48: OC-48/STM-16 Receiver without Clock Recovery (24-pin DIP) DTR-2488-SM: OC-48/STM-16 Transceiver without Clock Recovery (industry standard 1x9 package) DTR-2488-SM2: OC-48/STM-16 Transceiver without Clock Recovery (industry standard 2x9 package) DTC-48: OC-48/STM-16 Transceiver with Clock Recovery (industry standard 2x9 package) Ordering Information SRC 8 Supply Voltage 5V= 8 4 8 X Receivers 0 0 0 Wavelength Temperature Range Option 1100~1600nm PIN= R1 1100~1600nm APD= R2 -40 ~85˚C= I 0~70˚C= H Pigtail FC= P1 Pigtail ST= P2 Pigtail SC= P3 Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Communications, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Oplink Communications, Inc. for its use nor for any infringements of third parties, which may result from its use. No license is granted by implication or otherwise under any patent right of Oplink Communications, Inc. R3.2009.04.30 © 2008, Oplink Communications, Inc. 4