SRX12-APD
Application Notes
The receiver converts the incident optical power to Both differential DATA+ and DATA outputs (also
a photocurrent via a high performance avalanche SIGNAL DETECT+ and SIGNAL DETECT- if the PECL
photodiode (APD). The photocurrent can be monitored option is chosen) are open emitter PECL levels
via the differential voltage across the two VPM+ and requiring termination (50Ω to VCC - 2V or 510Ω to
VPM- output pins. It is important to note that the GRD is recommended). Both differential outputs
common mode voltage (i.e. DC voltages at PM+ and should be terminated in the same manner, even if
VPM-) is high (-60V typical). The APD bias voltage is only one is used.
APD Bias
Supply
220Ω
VPD
OUT
10kΩ
VPM-
temperature compensated to ensure stable operation
10kΩ
If the TTL option is chosen for the SIGNAL DETECT
VPM+
over the entire operating temperature range. The APD
outputs, no termination resistor should be used.
bias voltage is also available as an output via the VPD
The power supply line should be wellfiltered. The
output. The maximum current that this output can
APD
power supply should be bypassed by 0.01 or 0.1μF
source is 1mA.
ceramic chip placed as close to the receiver module
The signal detect circuit monitors the level of the
as possible.
incoming optical signal and generates a logic LOW signal
when an insufficient photocurrent is produced.
Package Outline
The pigtail length from the
Dimensions in inches [mm]
Default tolerances:
package edge is 1.0 meter typical.
.xxx = ± .005”, .xx = ± .01”
Related Transmitter & Receiver Modules
STX-12
SRX-12
SRX-12-L
SRC-12
: OC-12/STM-4 Transmitter (multi-sourced 20-pin DIP)
: OC-12/STM-4 Receiver without Clock Recovery, ECL SIGNAL DETECT (multi-sourced 20-pin DIP)
: OC-12/STM-4 Receiver without Clock Recovery, TTL SIGNAL DETECT (multi-sourced 20-pin DIP)
: OC-12/STM-4 Receiver with Clock Recovery (multi-sourced 20-pin DIP)
SRC-12-S : OC-12/STM-4 Receiver with Clock Recovery (24-pin DIP, compatible with Sumitomo SDT8712-RD)
Ordering Information
8
1
2
X
R
2
0
0
0
SRX
Type
RX only 5V= 8
Receivers
Temperature Range
-40 ~85˚C= I
0~70˚C= H
Connector Type &
Option
Wavelength Range
Rx 1100-1600nm APD
Pigtail FC, SD-TTL= PA
Pigtail ST, SD-TTL= PB
Pigtail SC, SD-TTL= P5
Pigtail FC, SD-PECL= PC
Pigtail ST, SD-PECL= PD
Pigtail SC, SD-PECL= P4
Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Commu-
nications, 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.
© 2008, Oplink Communications, Inc.
R3. 2008.04.30
3
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