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Fiber Optic "Light to Logic" Receiver Preliminary Technical Data
RCV1551
Features
* Light to Logic 20-pin DIP Receiver Offers ECL Compatibility * Long Reach, High Performance * Sensitivity -35 dBm * Single +5 V Supply * SONET/SDH Compliant * Multisourced
Description
The RCV1551 receiver provides optical signal conversion and processing. It contains an InGaAs PIN photodiode and high sensitivity, wide dynamic range, transimpedance amplifier, capacitively coupled to limiting amplifier stages with PECL output drivers. Also provided is a loss of signal alarm. The planar PIN photodiode operates throughout the 1200 nm to 1600 nm wavelength band. A CMOS wide dynamic range transimpedance amplifier optimized for 155 MBd operation provides low noise front end gain for the RCV1551.
A low pass filter maximizes the signal to noise ratio while minimizing intersymbol interference. The interface amplifier provides signal conversion and buffering for the PECL complementary data outputs. A complementary PECL alarm output is also provided. The receiver operates from +5 V and -5.2 V or +5 V and Ground power supplies. A 50/125 micron multimode fiber pigtail is included, assuring compatibility with multimode and single mode fiber optic systems.
Applications
* Telecommunication Networks * SONET OC3 and SDH STM1 Compatible * Local and Metropolitan Area Networks * ATM Single Mode Public Network * Military Communications and Control Systems Performance * Digital Cable TV Networks
Preliminary Product Disclaimer This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices, specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.
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Connection Diagram
Top View
FIBER PIGTAIL
GND GND GND GND NC GND DATA GND DATA PD BIAS
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
NC NC NC NC GND GND ALARM GND ALARM +5 V
Pin Descriptions
Pins 5, 17, 18, 19, 20 NC: These pins are not connected and should be left open circuit on the application PCB. Pins 1, 2, 3, 4, 6, 8, 13, 15, 16 GND: These pins should be connected to the circuit ground. Pins 7, 9, DATA, DATA: These pins provide complementary PECL DATA and DATA outputs. The DATA output is noninverting, an optical pulse causes the DATA output to go to the PECL logic high state (+4 V nominal).
Pin 10, PD Bias: This pin must be connected to any voltage from 0 V (GND) to -5 V. This provides the photodiode bias. The current drawn is directly proportional to the average received photocurrent. I = Responsitivity x Mean Power. The responsivity will be between 0.7 A/W and 1.0 A/W. Pin 11, +5 V: This pin should be connected to +5 V supply. The network shown below should be placed as close as possible to pin 11.
Pins 12, 14 ALARM, ALARM: These pins provide complementary differential ALARM and ALARM outputs. This is the low light alarm. ALARM goes to a logic low (3.3 V nominal) state when the optical power drops below the threshold level (insufficient optical power). The optical power must increase to a higher level than the level where the alarm went low before ALARM will return to a logic high. This difference is the alarm hysteresis.
1 H +5 V PIN 11 10 F 100 nF 100 nF
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Functional Description
Design The receiver contains an InGaAsP photodetector, transimpedance amplifier and interface amplifier circuit. It is designed with a multimode fiber pigtail to allow maximum flexibility in connector options. The interface amplifier is capacitively coupled to the preamplifier circuit. Terminating the Outputs The data outputs of the RCV1551 are PECL compatible. Care should be taken to match termination impedances to the interconnect to minimize reflection effects. Both serial data outputs (DATA and DATA) should be terminated identically, even if only one output is used, in order to balance the drive currents
drawn from the module. This will lower the power supply noise generated by the receiver and improve performance at low optical input power levels. Power Supplies The RCV1551 will operate to specifications with a single +5 V power supply (Pin 10 Grounded). The -5 V PIN bias is provided to maintain functional compatibility with second sources. Circuit Layout The RCV1551 uses very high bandwidth circuitry to achieve its high level of performance. Care must be taken to ensure stable operation. The use of ground planes and transmission line interconnects is required. The use of a standard evaluation board is highly recommended for those
users who are not familiar with these techniques. Signal traces should conform to ECL design rules to prevent reflections and ringing from degrading performance. Useful guidelines are contained in ECL manufacturer design manuals. Manufacturing The fiber pigtail on the device requires normal fiber handling considerations. Care should be taken to avoid tight bends as well as excessive tension on the fiber pigtail. The allowable temperature range for the RCV1551 is limited by the material used in the pigtail. Exposure to temperatures over +85C is not recommended. Low profile sockets and hand soldering are recommended for this part.
VCC (+5 V) ALARM ALARM
TRANSIMPEDANCE AMPLIFIER
LOW PASS FILTER
INTERFACE AMPLIFIER
DATA DATA
V NEG (-5 V OR GROUND)
GND (0 V)
Figure 1. Block Diagram.
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Performance Specifications Absolute Limiting Ratings
Absolute maximum limits mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided that each limiting parameter is in isolation and all other parameters have values within the performance specification. It should not be assumed that limiting values of more than one parameter can be applied to the product at the same time.
Parameter Supply Voltage Supply Voltage
Symbol VCC VNEG
Minimum -0.5 -10
Maximum +5.5 +0.5
Units V V
Note 1 -
Environmental Parameters
Parameter Operating Temperature Storage Temperature Humidity Symbol Minimum -40 -40 Maximum +85 +85 85 Units C C %RH Note -
Electrical Parameters (-40C to +85C)
Parameter Supply Voltage Supply Voltage VCC Supply Current VNEG Supply Current DATA Output Level (high) DATA Output Level (low) ALARM Output Level (high) ALARM Output Level (low) Symbol VCC VNEG V off V on Minimum 4.75 0 3.8 3.1 3.8 3.1 Maximum 5.25 -6.0 130 1.0 4.15 3.5 4.15 3.5 Units V V mA mA V V V V Note 4 2, 3 2, 3 2, 3 2, 3
Notes: 1. VCC of -0.5 V and VNEG of +0.5 V may not be applied simultaneously. 2. Output terminated to (VCC -2) with 50 load or equivalent. 3. Output voltages are for VCC = 5.0 V. 4. Outputs not loaded.
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Optical Parameters (-40C to +85C)
Parameter Wavelength Receiver Sensitivity Maximum Input Power Alarm ON Hysteresis Alarm Response Time Reliability Target Minimum 1200 0 -45 0.5 Maximum 1600 -35 -36 7.0 600 1000 Units nm dBm dBm dBm dB S FIT Note 1 -
Note: 1. At a BER of 1 x 10-10, 223-1 PRBS pattern NRZ data at the line rate with 10:1 extinction ratio. EOL.
Fiber Pigtail Core Diameter Cladding Diameter Secondary Coating Diameter
Typical 50 125 900
Units microns microns microns
Drawing Dimensions
L 20 11
C
1 B A
10
D J H
K DIM. A B C D E F G H J K L MIN. 32.9 9.9 16.0 - 2.26 - - 2.7 5.2 - 400 NOM. - - - - - 2.54 0.46 - - 10.16 - MAX. 33.1 10.1 16.3 9.27 2.62 - - 3.2 5.6 - 1220
G
F
E
ALL DIMENSIONS IN MILLIMETERS
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Ordering Information
RCV1551 XX Connector: FP = FC/PC Polish ST = ST(R)* SC = SC DN = DN Model Name: RCV1551
Handling Precautions
1. The RCV1551 can be damaged by current surges or overvoltage. Power supply transient precautions should be taken. 2. Normal handling precautions for electrostatic sensitive devices should be taken.
*ST(R) is a registered trademark of AT&T.
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