sx8724s Semtech Corporation, sx8724s Datasheet - Page 24

• Manufacturer Part Number: sx8724s
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.0
© Semtech
To remain within the signal compliance of the ADC (no saturation), the condition:
must be verified.
Finally, combining
V
where the total PGA gain is defined as:
and the total PGA offset is:
ADVANCED COMMUNICATIONS & SENSING
IN
by:
Equation 5
February 2011
to
Equation 7
V
IN
,
ADC
GDoff
=
GD
V
for the three PGA stages, the input voltage V
IN
GD
TOT
,
TOT
ADC
TOT
=
⋅
V
<
Equation 10
Equation 11
Equation 12
Page 24
Equation 9
GDoff
=
IN
⎛
⎜
⎝
GD
V
−
REF
2
GDoff
3
3
⋅
⎞
⎟
⎠
GD
+
⎛
⎜
⎝
GD
OSR
TOT
2
ZoomingADC for sensing data acquisition
OSR
⋅
3
GD
⋅
⋅
−
GDoff
S
1
1
⋅
⎞
⎟
⎠
V
REF
2
[
V
]
IN,ADC
of the ADC is related to
SX8724S
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