SX8723CWLTDT SEMTECH [Semtech Corporation], SX8723CWLTDT Datasheet - Page 22

• Manufacturer Part Number: SX8723CWLTDT
• Description: ZoomingADC for sensing data acquisition
• Manufacturer: SEMTECH [Semtech Corporation]

Revision 1.01
© Semtech
Similarly, the reference voltage is chosen among two differential channels (V
V
be up to the power supply range.
7.4 First Stage Programmable Gain Amplifier (PGA1)
The first stage can have a buffer function (unity gain) or provide a gain of 10 (see
output of PGA1 is:
where GD
ADVANCED COMMUNICATIONS & SENSING
Sign S = 1
REF,IN
(RegACCfg5[5:1])
-V
Amux
10000
10001
10010
10011
10100
10101
10110
10111
00x01
00x10
00x11
SS
1
) as shown in
is the gain of PGA1 (in V/V) controlled with the Pga1Gain bit.
Table
1.
January 2011
AC1(V
AC0(V
V
AC3
AC5
N.C.
AC2
AC3
AC4
AC5
N.C.
N.C.
INP
(RegACCfg5[0])
10. The selection bit is Vmux. The reference inputs V
External voltage reference on D1 GPIO pin. See
GPIO and “RegMode[0x70]” on page 46.
REF
SS
)
)
Vmux
0
1
Table 10. Analog reference Input Selection
(RegACCfg3[7])
Pga1Gain bit
Table 9. Analog Input Selection
Table 11. PGA1 gain settings
0
1
AC0(V
V
AC2
AC4
N.C.
V
INN
D
SS
1
V
)
REF
=
Page 22
Equation 5
GD
V
= V
REF
V
BG
1
REFP
= V
⋅
or V
V
Sign S = -1
BATT
IN
(RegACCfg5[5:1])
REF,IN
ZoomingADC for sensing data acquisition
1
PGA1 gain [V/V]
[
Amux
11000
11001
11010
11011
11100
11101
11110
11111
01x01
01x10
01x11
V
section 6.3 on page 15
GD
]
1
10
1
[V/V]
REF
= V
V
Table
V
V
REFN
REFP
SS
SS
BATT
AC0(V
and V
-V
V
11). The voltage V
AC2
AC4
N.C.
www.semtech.com/products/
INP
SS
about
SS
, V
REFN
)
REF
SX8723C
= V
(common-mode) can
BG
DATASHEET
-V
SS
AC1(V
AC0(V
D1
or V
V
AC3
AC5
N.C.
AC2
AC3
AC4
AC5
N.C.
N.C.
INN
at the
REF
SS
REF
)
)
=