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ADVANCED COMMUNICATIONS & SENSING
13.5
Voltage Control
The voltage control allows to select or read the board voltage. This allow the GUI to compute ZoomingADC
parameters and data values function of the registers settings in the GUI, for example the estimated device
performance. V
Note that the V
For more precise data values in the GUI, the User has the possibility to set manually the real device voltage
value.
13.6
Estimated Device Performances
These data are theoretical values extracted from registers settings and computed according to the equations
available in the datasheet. The values expressed in Volt units [V] are function of the V
user
(13.5. Voltage
Input impedance – observed input impedance of the first PGA stage that is enabled or the input
impedance of the ADC if all three stages are disabled. Cg multiplied by gain is the equivalent gain
capacitor and Cp is the parasitic capacitor of the first enabled stage. The applied equation is:
Input referred noise – the simple noise model described in the datasheet is used to estimate the equivalent
input referred rms noise V
ACS - Revision 1.0
© Semtech Corp.
is read at the connection of the EVK or when the External V
BATT
Figure 22. Voltage Control
voltage or external V
BATT
Control) in the GUI.
Figure 23. Computed Data Display
Z
in
of the acquisition chain. It is computed with the extracted rms output noise
N,IN
May 2011
Evaluation Kit for SX8724S Data Acquisition System
voltage are estimated according to a 1.22V bandgap reference.
REF
1
=
Ω
[
(
)
⋅
+
Cg
GD
Cp
Page 27
SX8724SEVK
setting is changed.
REF
]
USER GUIDE
voltage set by the
REF
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