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ADVANCED COMMUNICATIONS & SENSING
17.7
ADC Configuration
The following PGA and ADC set-up is chosen to implement the measurement window. With this set-up, the
input voltage range of the circuit corresponding to the full scale output code range is 4.5mV to 8.5mV. This
window is represented in
Sensor output Voltage vs Pressure @ 3.3V supply
16
Min
14
Typ
Max
12
10
8
6
4
2
0
-2
40
0
20
60
BIAS
Vs
GND
ACS - Revision 1.0
© Semtech Corp.
Figure
38.
80
100
120
140
160
180
200
Pressure [kPa]
VBATT
D0
VSS
AMUX
VSS
VOUT+
VREF
AC 3
AC 2
VOUT -
Analog Inputs
Reference Inputs
V
REF,ADC
VBATT
VSS
VREF
VSS
VMUX
Figure 40. PGA Parameters
May 2011
Evaluation Kit for SX8724S Data Acquisition System
ADC input sensor voltage vs pressure
1800
1600
1400
1200
1000
800
600
400
200
0
89
V
V
IN
D1
±
±
Vin
Vin
S
±
Voff
PGA1
PGA2
ANALOG ZOOM
Page 45
SX8724SEVK
Min
Typ
Max
91
97
93
95
99
101
103
Pressure [kPa]
V
D2
±
Vin
±
Voff
PGA3
www.semtech.com
USER GUIDE
105
107
V
IN,ADC
±
Vin
±
Vref
ADC
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