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AMS101 Evaluation Card User Guide
UG886 (v1.3) November 6, 2013
Chapter 4:
AMS Evaluator Tool
XADC Configuration
The XADC control panel highlighted in
Figure 4-2
allows changes to several internal
XADC configuration registers. These panels specify the XADC sampling rate, the input
signal type (unipolar or bipolar), and either single channel mode or simultaneous channel
mode. Changing any of the items on the XADC Control panel writes the appropriate data
to the XADC register automatically.
The XADC sample rate can be set between 100 kilo-samples per second (kSPS) and
1 MSPS. Unipolar inputs force the negative analog input to ground and the positive input
can swing between 0 and 1V. Bipolar inputs allow both analog inputs to swing +/-500 mV,
with a common-mode range between 0 and 1V. Single channel mode measures data on the
V
P
/V
N
channels. Simultaneous sampling mode sends the same analog signals onto both
DACs over channels V
AUXP0
/V
AUXN0
and V
AUXP8
/V
AUXN8
.
The default mode of operation is single channel, bipolar, and sampling at 961.4 kSPS.
Channel Options—Single Channel/Simultaneous Sampling
To select between the two modes of operation, single channel mode and simultaneous
sampling mode, select the desired option from the
Channel Options
pull-down menu
located in the XADC control panel (see
Figure 4-2
). After the
Channel Options
pull-down
menu changes, the appropriate data is written to the XADC registers.
X-Ref Target - Figure 4-2
Figure 4-2:
XADC Configuration Control Panel
XADC
Configuration
Control
UG
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