Техническая Спецификация для Texas Instruments VCA5807 Evaluation Module VCA5807EVM VCA5807EVM
Модели
VCA5807EVM
Quick Start
5
Quick Start
This section assumes all engineering knowledge on the device and basic overview of the VCA5807EVM.
5.1
Test Setup
Connect the EVM as shown in . Typical input signals are 5 MHz at –32 dBm. This can be applied to any
VCA input (J1-J8). If the signal is noisy, consider using a 5-MHz filter. Connect a scope or a spectrum
analyzer to the corresponding VCA output in order to measure the gain on the channel.
VCA input (J1-J8). If the signal is noisy, consider using a 5-MHz filter. Connect a scope or a spectrum
analyzer to the corresponding VCA output in order to measure the gain on the channel.
5.2
Power Up VCA5807EVM
Connect ±5-V power to the board. No other power connection is needed.
5.3
Launch the VCA5807 GUI
Launch the VCA5807EVM GUI. Execute a software reset with the GUI and verify the current consumption
drops from
drops from
≈
0.762 A to
≈
0.646 A. Enable the Active Termination Resistor of 50 Ohms (check the box) on
the LNA+VCA+PGA+LPF tab. This tab is also used to vary the gain on each channel. However, with the
default settings as shown in , the gain should be 42 dB overall. Therefore, with an input signal of 5 MHz at
–32 dBm, load resistance of 50
default settings as shown in , the gain should be 42 dB overall. Therefore, with an input signal of 5 MHz at
–32 dBm, load resistance of 50
Ω
, and an overall gain of 42 dB, the output should read
≈
4 dBm or 1 Vpp.
For more details and other modes for testing and evaluating the VCA5807 device, please refer to the
previous pages of this development guide.
previous pages of this development guide.
17
SLOU352 – November 2012
VCA5807 Development Guide
Copyright © 2012, Texas Instruments Incorporated