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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.

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 ≈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 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.

SLOU352–November 2012 VCA5807 Development Guide

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