SPCM-AQ4C-IO User Guide Datasheet by Excelitas Technologies

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www.excelitas.com Page 1 of 6 SPCM-AQ4C-IO (2015-09)
APPLICATION NOTE
Photon Detection
SPCM-AQ4C-
I
O
P/N
760-1
Interface Board for SPCM-AQ4C
Modu
l
es
USERS
GU
I
DE
Document #
EO-674-04
SPCM-AQ4C-IO S
SPCM-AQ4C-IO
SPCM-AQ4C Interface Board
www.excelitas.com Page 2 of 6 SPCM-AQ4C-IO (2015-09)
SPCM-AQ4C-IO Interface
Board
for the SPCM-AQ4C Photon Counting
Module
Users
Guide
This manual applies to the SPCM-AQ4C-IO (Excelitas internal #760-1) interface board when
used with the SPCM- AQ4C 4-channel single photon counting modules. This board is used to
facilitate connecting power and signal connections to the SPCM-AQ4C modules for users who
do not wish to build their own interface.
1. When handling the module, ESD precautions must be observed.
2. The SPCM-AQ4C module contains a high voltage power supply. When the board is under
power, high voltages are present on the board. Keep fingers and tools away from the
components on the board.
3. Do not touch the gold contacts on the card edge connector with bare fingers. Do not modify
or adjust any components. Do not pull on the FC connectors to remove the module from the
card edge connector.
4. The SPCM-AQ4C has been designed to operate from
5
°
C
to
40
°
C
(10
°
C
to
40
°
for CD3122
version). Make sure that the heatsink has good airflow. The temperature of the heatsink
will be determined by two factors. The first will be the ambient temperature of the system in
which the card is installed. The second is determined by the count rate of the card. Higher
count rates will cause the detector to heat up. In turn, the cooler circuit will compensate by
transferring the heat from the detector to the heatsink. As the heatsink gets warmer, the
operating margin (temperature) gets smaller. At
40
°
C
, the dark count will be stable, but
above 2Mcps the operation may become unpredictable.
5. Refer to the SPCM-AQ4C data sheet for performance and operating data.
6. Each detector is individually calibrated. Do not attempt to adjust any of the potentiometers or
jumpers on the SPCM-AQ4C PCB. To do so could cause damage to the detector or the
module electronics.
7. If the board is operated in high-level ambient lighting, some photons may enter the detector
through the glass seal around the pins at the back of the detector assembly. Try to keep
stray light from shinning directly at the pins at the back of the detector assembly. The pins
can be recognized by where they attach to the small flex circuit that connects the
detector assembly to the PCB.
8. Use 18 gage wire or larger for the +2V supply and +2 V return. Keep the length as short as
possible to avoid having a large voltage drop when the coolers are drawing maximum current
(which can reach over 4 amps). If you need longer length, use heavier wire gage. You should
design wiring harnesses to keep the total voltage drop to less than 100mV.
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SPCM-AQ4C-IO
SPCM-AQ4C Interface Board
www.excelitas.com Page 3 of 6 SPCM-AQ4C-IO (2015-09)
9. Connecting the Interface Board to the SPCM-AQ4C Module. Note that a power cable is
supplied with each I/O board.
9.1. Locate the position of the key slot on the SPCM PCB before attempting to mate the module to
the interface board. Refer to the connector pin-out diagram and figure 9.1.
FIGURE 9.1 JUMPER SETTING FOR GATE CONTROL
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SPCM-AQ4C-IO
SPCM-AQ4C Interface Board
www.excelitas.com Page 4 of 6 SPCM-AQ4C-IO (2015-09)
9.2. Jumper Positions: There are a number of jumpers on the interface board that control how the
gating functions of the module operate. The interface board can be configured to allow
independent gating of each channel or it can be configured to allow simultaneous gating
of all the channels from one GATE input.
9.3. As shipped, the I/O board has been configured to gate all channels of each module
simultaneously. The gating can be accomplished by using a TTL level signal capable driving a
50 ohm load (100mA @ 5V). The signal can be connected to any one of the GATE Input
connectors and all channels will be controlled in parallel.
9.4. To convert to independent gating of the channels, refer to the table in figure 9.1. You
will need a different signal source for each channel that you want to gate.
9.5. Note that with no gate signal or floating gate inputs, the module will be in the gated ON”
position and ready to count photons.
9.6. The module channels will be GATED ON” with a low-level TTL (<0.8V) signal applied to the
gate connector. A high level TTL (>2V, <5.25) signal applied to the gate connector will gate
the module channels off.
9.7. OUTPUT. The output of each channel is a TTL level signal and is obtained from the bottom BNC
connector for each channel. EACH output channel MUST be terminated into a 50-ohm load
at the measurement source (counter, scope, etc) for correct operation. Refer to figure 9.2.
FIGURE 9.2 REAR PANEL
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SPCM-AQ4C-IO
SPCM-AQ4C Interface Board
www.excelitas.com Page 5 of 6 SPCM-AQ4C-IO (2015-09)
10. Power Cable Connections
10.1. R e f e r to figure 10.1 for wiring connections.
10.2. As usual, cables should be kept as short as possible to minimize voltage drops in the
wires. Minimize potential ground loops by connecting ground wires at a single point.
10.3. The power supplies that you choose should be well-regulated and low noise. Ripple and
noise should be kept below 50mV p-p. Each photon- counting channel is internally protected
from current overloads. However, it is always prudent to use power supplies that are capable
of current limiting to the maximum specified current for each module.
11. Mechanical Dimensions
Figure 10.1 Power Connector Wiring
Figure 11.1 Dimensions in inches
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SPCM-AQ4C-IO
SPCM-AQ4C Interface Board
www.excelitas.com Page 6 of 6 SPCM-AQ4C-IO (2015-09)
RoHS Compliance
The SPCM-AQ4C-IO is designed and built to be fully compliant with the European Union
Directive 2011/65/EU Restriction of the use of certain Hazardous Substances (RoHS) in
Electrical and Electronic equipment.
Warranty
A standard 12-month warranty following shipment applies. Any warranty is null and void if
the photodiode window has been opened.
About Excelitas Technologies
Excelitas Technologies is a global technology leader focused on delivering innovative,
customized solutions to meet the lighting, detection and other high-performance
technology needs of OEM customers.
Excelitas has a long and rich history of serving our OEM customer base with optoelectronic
sensors and modules for more than 45 years beginning with PerkinElmer, EG&G, and RCA.
The constant throughout has been our innovation and commitment to delivering the
highest quality solutions to our customers worldwide.
From analytical instrumentation to clinical diagnostics, medical, industrial, safety and
security, and aerospace and defense applications, Excelitas Technologies is committed to
enabling our customers' success in their specialty end-markets. Excelitas Technologies has
approximately 5,000 employees in North America, Europe and Asia, serving customers
across the world.
Excelitas Technologies
GmbH & Co. KG
Wenzel-Jaksch-Str. 31
D-65199 Wiesbaden
Germany
Telephone: (+49) 611 492 430
Fax: (+49) 611 492 165
detection.europe@excelitas.com
Excelitas Technologies Singapore, Pte. Ltd.
8 Tractor Road
Singapore 627969
Telephone: (+65) 6775 2022 (Main number)
Telephone: (+65) 6770 4366 (Customer Service)
Fax: (+65) 6778-1752
detection.asia@excelitas.com
For a complete listing of our global offices, visit www.excelitas.com/locations
© 2015 Excelitas Technologies Corp. All rights reserved. The Excelitas logo and design are registered trademarks of Excelitas Technologies Corp. All other trademarks not owned by Excelitas Technologies or its subsidiaries that are
depicted herein are the property of their respective owners. Excelitas reserves the right to change this document at any time without notice and disclaims liability for editorial, pictorial or typographical errors.

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