参数资料
型号: SX8725CWLTDT
元件分类: ADC
英文描述: 2-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PDSO12
封装: 4 X 4 MM, HALOGEN FREE AND ROHS COMPLIANT, MLPD-12
文件页数: 15/68页
文件大小: 1718K
代理商: SX8725CWLTDT
www.semtech.com/products/
Page 22
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
Similarly, the reference voltage is chosen among two differential channels (VREF = VBATT-VSS, VREF = VBG-VSS or VREF =
VREF,IN-VSS) as shown in Table 10. The selection bit is Vmux. The reference inputs VREFP and VREFN (common-mode) can
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 Table 11). The voltage VD1 at the
output of PGA1 is:
where GD1 is the gain of PGA1 (in V/V) controlled with the Pga1Gain bit.
00x01
AC3
AC2
01x01
AC2
AC3
00x10
N.C.
01x10
N.C.
00x11
N.C.
01x11
N.C.
10000
AC0(VSS)
11000
AC0(VSS)
10001
AC1(VREF)
11001
AC1(VREF)
10010
AC2
11010
AC2
10011
AC3
11011
AC3
10100
N.C.
11100
N.C.
10101
N.C.
11101
N.C.
10110
N.C.
11110
N.C.
10111
N.C.
11111
N.C.
Table 10. Analog reference Input Selection
Vmux
(RegACCfg5[0])
VREFP
VREFN
0VREF = VBATT
VSS
1
VREF = VBG or VREF,IN1
1.
External voltage reference on D1 GPIO pin. See section 6.3 on page 15 about
VSS
Equation 5
Table 11. PGA1 gain settings
Pga1Gain bit
(RegACCfg3[7])
PGA1 gain [V/V]
GD1 [V/V]
01
110
Table 9. Analog Input Selection
Amux
(RegACCfg5[5:1])
VINP
VINN
Amux
(RegACCfg5[5:1])
VINP
VINN
Sign S = 1
Sign S = -1
]
[
1
V
GD
V
IN
D
=
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