Texas Instruments PGA112EVM, User Manual

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EVM Hardware Overview
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In some cases, the Windows Add Hardware Wizard starts. If this prompt appears, allow the system device
manager to install the human interface drivers by clicking Yes when requested to install drivers.
3.4 Powering the EVM
By default, a 0- Ω resistor (R1) is used to short DVDD and AVDD together, with both being supplied by the
SM-USB-DIG Platform. If a different supply is desired for AVDD, R1 can be removed and the supply can
be connected to the AVDD and GND test points. The SM-USB-DIG Plartform can supply 5 V or 3.3 V to
the EVM.
3.5 EVM Features
This section describes some of the hardware features present on the PGA112EVM and PGA113EVM
boards. Note that these two EVMs are identical except for the device name.
3.5.1 Communication Test Points
The PGA112EVM and PGA113EVM boards feature test points (CS, DIO, and CLK) for monitoring
communication between the SM-USB-DIG Platform and the PGA112 (or PGA113) device, as shown in
Figure 6 . The test points allow external signals to be connected if the EVM is integrated into a custom
application or prototype. Note that if the SM-USB-DIG Platofrm is not being used, an external power
source must be connected to DVDD and AVDD.
Figure 6. PGA112EVM Hardware
(Note that the PGA113EVM is identical except for the device name)
3.5.2 Output Test Points
Test point VOUT is used for measuring the output of the EVM.
3.5.3 Voltage Reference
For simplicity, the VREF input of the EVM is shorted to ground through 0- Ω resistor R2 by default. If a
different VREF is desired, R2 can be removed.
3.5.4 Analog Input Signals
Test points VCAL/CH0 and CH1 are used for connecting the input signals to the EVM, as shown in
Figure 6 .
6 PGA112EVM and PGA113EVM User’s Guide SBOU073A – February 2009 – Revised May 2012
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