QPB7432
Optical to Electrical Receiver User Manual
Optical Receiver User Manual
– Rev 02, Aug 12, 2018
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7 of 9
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®
1.
Clean the optical connector with an Optical Fiber Connector Cleaner* and connect the input from the optical
source/Optical attenuator.
2.
Connect the RF out to Spectrum Analyzer or Network Analyzer as needed
3.
Most of the test setup for this EVB requires two power supplies and a multimeter
4.
GND - Connect the GND of all power supplies and the multimeter to the GND pin of the 6-pin header. This has to
be done before connecting any supply to the EVB to avoid issues related to floating GND.
5.
12V - Leave the 12V unconnected as the board is configured for 5V only operation from the factory
6.
OPS - Connect the Optical Power Sense pin to a multimeter to measure volts
7.
MODE - The MODE is pre-set to high. Leave it unconnected.
8.
Vc - Attenuator Control voltage pin: Connect this pin to a DC variable supply which can vary from 0V to 4.5V. Do
not switch on the power at this point.
9.
5V
–
Vdd supply pin
–
Set the DC Lab power supply with current limit to 5V, limit the current to 225mA and then
connect to this pin. Make sure the current drawn is less than 200mA.
10.
Switch on the 5 Volt DC power supply for Vc and perform the test
6 Pin Header
O
PS
12
V
G
N
D
Mo
de
VC
5
V
The EVB is configured to work with 5Volt from the Factory. To convert to 12Volts operation the following steps need to be
taken:
1.
Disconnect any power connected to the EVB
2.
Remove (Do NOT populate) the parts L10, L12 and R17
3.
Populate the Inductor L11
4.
Change the value of R4 to 1kOhms
Now the board is configured to work with 12 Volts supply. To proceed with the tests, connect the second pin of the
header to 12V and setup the current to same 225mA. Leave the 5V pin (last pin of the connector unconnected.
The Board may get warmer than the 5V operation as the extra power is being dissipated via the resistors.
•
Please use NTT AT CLETOP Reel or similar cleaner
Test set-up for 5V operation
Test set-up for 12V operation