Datasheet

GUI Software Installation and Use

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Once the connections are configured, click on the Connect button on the upper left corner of the control

panel GUI. If the control panel successfully connects to the PGA870EVM, then the button label changes

from Connect to Disconnect as Figure 5 shows. If the control panel software cannot connect to the

PGA870EVM, the Connect button does not change to Disconnect. No other error message is generated.

Note: The button has changed from Connect to Disconnect.

Figure 5. PGA870EVM Control Panel GUI After Successful Connection to PGA870EVM

The boxes on the left side of the control panel GUI (see Figure 4) under the GainBit heading indicate the

corresponding gain control bits as described in the PGA870 product data sheet. Bit B0 is the least

significant bit (LSB) of the gain control word; it represents the smallest gain step of 0.5 dB. Bit B5 is the

largest gain step (16 dB), and corresponds to the most significant gain control bit (MSB). Checking a box

causes the GUI software to send a high signal to the corresponding gain control bit. Figure 5 corresponds

to a minimum PGA870 gain of –11.5 dB.

The PGA870 gain corresponding to the gain setting (that is, the GainBit checked boxes) appears in the

number field entitled, Overall PGA870 Gain (dB). The actual measured gain of the EVM may be less than

the selected PGA870 gain because of losses in the resistive load and the EVM transformers.

The number field labeled Input Attenuation (dB) shows the equivalent loss of the PGA870 input

attenuator. Consult the device data sheet for additional information.

PGA870EVM SBOU082A–December 2009–Revised February 2010

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