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ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
SX8724SEVK
Evaluation Kit for SX8724S Data Acquisition System
ACS - Revision 1.0 May 2011
© Semtech Corp.
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
.
Figure 40. PGA Parameters
ADC input sensor voltage vs pressure
0
200
400
600
800
1000
1200
1400
1600
1800
Pressure [kPa]
Vo
lt
ag
e[mV
D
C
]
Min
Typ
Max
-2
0
2
4
6
8
10
12
14
16
Pressure [kPa]
Ou
tp
u
t V
o
lt
ag
e [
m
V
D
C
]
Min
Typ
Max
Sensor output Voltage vs Pressure @ 3.3V supply
PGA1
PGA2
PGA3
ADC
±
Vin
±
Vin
±
Vin
±
Vin
±
Voff
±
Voff
±
Vref
AMUX
Analog Inputs
VMUX
Reference Inputs
V
IN
V
D1
V
D2
V
IN,ADC
V
REF,ADC
VSS
VREF
VSS
VBATT
VSS
VREF
ANALOG ZOOM
S
GND
BIAS
VOUT+
VOUT -
Vs
D0
AC 3
AC 2
VBATT
VSS
89
91
93
95
97
99
101
103
105
107
0
20
40
60
80
100
120
140
160
180
200
