Datasheet

5.3 TSW7001 GUI Software
Software www.ti.com
The hardware is found and is ready to use.
Once the TSW7001 GUI is started, and the EVM has gone through USB enumeration, the CONNECT
button must be pressed to establish an open communications channel between the PC and the TSW7001.
The GUI responds with a message indicating that communication has been established.
At this point, static voltage levels can be programmed to set the VCA824 to a fixed gain from the front
panel by entering decimal values in the Write text box and clicking the WRITE button. The control DAC
values can range from 0-65535 (16 bit DAC). The 40-dB gain is controlled by this voltage.
The front panel also has two special cyclic functions: a step function and a ramp function. The step
function has a text box to enter the low-step DAC value and the time length and the high-step DAC value
and the time length. Each unit of time is accounted as one time tick which is one USB update cycle. This
varies from computer to computer and can be 10-30 ms long. The ramp function is similar and requires
entering the start and stop values of the ramp and the rise and fall time length in time-tick increments.
Logging of the data writes is optional and can be controlled by checking the Log Output box. The
message window can be cleared with the Clear button.
8 Voltage-Controlled Amplifier Evaluation Kit SLWU058 – August 2008
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