RGR1551-SC Avago Technologies US Inc., RGR1551-SC Datasheet - Page 3

• Manufacturer Part Number: RGR1551-SC
• Manufacturer: Avago Technologies US Inc.

Specifications of RGR1551-SC

• Optical Fiber Type: RX
• Data Transfer Rate: 155Mbps
• Operating Temperature Classification: Industrial
• Peak Wavelength: 1600nm
• Package Type: DIP With Connector
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Temp Range: -40C to 85C
• Mounting: Through Hole
• Pin Count: 20
• Lead Free Status / RoHS Status: Not Compliant

Functional Description
Design
The receiver contains an InGaAs photodetector, tran-
simpedance amplifier and interface amplifier circuit,
including a clock recovery and data retiming function. It is
designed with a multimode fiber pigtail to allow maximum
flexibility in connector options.
The transimpedance amplifier outputs are ac coupled to
the mid amplifier which in turn is connected to the Clock
and Data recovery circuit.
Terminating the Outputs
The data outputs of the RGR1551 are PECL compatible.
Care should be taken to match termination impedances
to the interconnect to minimize reflection effects. In order
to balance the drive currents drawn from the module, all
serial data outputs (DATA and DATA, CLOCK and CLOCK)
should be terminated identically, even if only one output
is used. This will lower the power supply noise generated
by the receiver and improve performance at low optical
input power levels.
Power Supplies
The RGR1551 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.
Figure 1. Block Diagram
(-5 V or Ground)
3
V neg
Transimpedance
Amplifier
Low Pass Filter
V
GND (0 V)
CC
Mid Amplifier
(+5 V)
PLL
Clock and
Data
Recovery
Circuit Layout
The RGR1551 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 perfor-
mance. Useful guidelines are contained in ECL manufac-
turer 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 RGR1551 is
limited by the material used in the pigtail. Exposure to
temperatures over +85°C is not recommended. Low
profile sockets or hand soldering are recommended for
this part.
ALARM
ALARM
CLOCK
CLOCK
DATA
DATA