Using the THS3491 EVM
5
SLOU483 – August 2017
Copyright © 2017, Texas Instruments Incorporated
THS3491RGT Evaluation Module
3
Using the THS3491 EVM
This section describes how to connect the THS3491 EVM to test equipment. TI recommends connecting
the EVM as described in this section to avoid damage to the EVM or the THS3491 installed on the board.
CAUTION
Caution hot surface. The PCB surface can get very
hot while passing high-output voltage swings.
Contact may cause burns. Do not touch
3.1
Required Equipment
The following equipment is required:
•
Dual dc output power supply (±15 V, 200-mA output minimum).
•
Two dc current meters with resolution to 1 mA and capable of a maximum current which the dc power
supply can supply. If available, set the current limit on the dc power supply to 200 mA.
NOTE:
Some power supplies incorporate current meters which may be applicable to this test.
•
50-
Ω
source impedance signal generator (10 MHz, up to 4 V
PP
sine wave).
•
Oscilloscope (100-MHz bandwidth minimum, 50-
Ω
terminated BNC input).
3.2
Power Supply Setup (Reference
Use the following procedure for power supply setup:
•
Before connecting the power supply cables to the EVM, set the dual dc output power supply to ±15 V.
•
Make sure the dc power supply is turned off before proceeding to the next step.
•
Connect the +15-V power supply to the +Vs of the power supply port on the EVM.
•
Connect the –15-V power supply to the -Vs of the power supply port on the EVM.
•
Connect the grounds of the +15-V and –15-V power supply to the GND port on the EVM.
•
Make sure the dc current meters on the dual dc output power supply are set to at least 1-mA resolution
and are set to 200-mA minimum output current capability.
•
Turn-on the dual dc power supply to ±15 V
3.3
Input and Output Test Setup (Reference
Use the following procedure for input and output test setup:
•
Set the signal generator to a 10 MHz, ±1.14 V (2.28 V
PP
or 11.1 dBm) sine wave with no dc offset. The
signal generator output should be set in 50-
Ω
termination mode.
•
Turn off the signal generator before proceeding to the next step.
•
Connect the signal generator output to SMA connector J2 on the EVM.
•
Oscilloscope channel 1 should be connected to SMA connector J3 on the EVM. Set the oscilloscope to
500 mV / division and a time-base of 1
μ
s / division.
NOTE:
The oscilloscope must be set in a 50-
Ω
termination for proper operation.
•
Turn on the signal generator. The measured output on the scope channel 1 at SMA connector J3
should approximately be ±250 mV (500 mV
PP
).
