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ADVANCED COMMUNICATIONS & SENSING
13.4
ZoomingADC controls
The ZoomingADC control sections allows the user to configure the acquisition chain of the SX8724S by
selecting the control corresponding to the desired mode. Note that the settings are applied to the device
registers as soon as the control is changed.
The representation picture on the top gives an indication of the settings applied to the ZoomingADC.
13.4.1 Reference selection control
This control allows to choose the reference voltage of the acquisition chain. This can be the internally
generated V
REF
When the control selects V
from GPIO. See
13.4.2 Inputs controls
The controls in the group named "Inputs" lets the user choose which inputs and which reference pins will be
used to make the measurement. On this group of controls the user may also choose if the inputs are "Single-
ended" or "Differential" as well as choosing which of the inputs is used as "Positive" or "Negative" input.
13.4.3 PGA controls
The group of controls named "PGA" lets the user control the gain, offset and enabling disabling each PGA
individually.
The user has also the possibility to control the PGAs biasing current ratio.
ACS - Revision 1.0
© Semtech Corp.
Figure 20. ZoomingADC Control Sections
with a nominal value of 1.22V or V
, it can also be selected combined with a GPIO to provide a reference voltage
REF
Section 13.4.7
for details.
May 2011
Evaluation Kit for SX8724S Data Acquisition System
(2.4V to 5.5V).
BATT
Page 24
SX8724SEVK
USER GUIDE
www.semtech.com
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