參數(shù)資料
型號(hào)： SX8723E083TRT
元件分類： ADC
英文描述： 5-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO12
封裝： 4 X 4 MM, ROHS COMPLIANT, MLPD-12
文件頁(yè)數(shù)： 11/53頁(yè)
文件大小： 3978K
代理商： SX8723E083TRT
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
19
SX8723
ZoomingADC for Pressure and Temperature Sensing
Input Multiplexers
The ZoomingADC has eight analog inputs AC0 to AC7 and four reference inputs AC_R0 to AC_R3. Let us first
define the differential input voltage VIN and reference voltage VREF,ADC respectively as:
INN
INP
IN
V
=
(V)
Equation 3
and:
REFN
REFP
ADC
REF
V
=
,
(V)
Equation 4
As shown in Table 2, the inputs can be configured in two ways: either as 4 differential channels (VIN1 = AC1 -
AC0,..., VIN3 = AC5 – AC4), or AC0 can be used as a common reference, providing 5 signal paths all referred to
AC0. The control word for the analog input selection is AMUX[4:0]. Notice that the bit AMUX[3] controls the sign
of the input voltage.
AMUX[4:0]
(RegACCfg5[5:1])
VINP
VINN
AMUX[4:0]
(RegACCfg5[5:1])
VINP
VINN
00x00
AC1 (VREF)
AC0 (VSS)
01x00
AC0 (VSS)
AC1 (VREF)
00x01
AC3
AC2
01x01
AC2
AC3
00x10
AC5
AC4
01x10
AC4
AC5
10000
AC0 (VSS)
11000
AC0 (VSS)
10001
AC1 (VREF)
11001
AC1 (VREF)
10010
AC2
11010
AC2
10011
AC3
11011
AC3
10100
AC4
11100
AC4
10101
AC5
AC0 (VSS)
11101
AC0 (VSS)
AC5
Table 2 - Analog Input Selection
Similarly, the reference voltage is chosen among two differential channels (VREF,ADC = AC_R1 - AC_R0 or
VREF,ADC = AC_R3 - AC_R2) as shown in Table 3. The selection bit is VMUX. The reference inputs VREFP and
VREFN (common-mode) can be up to the power supply range.
VMUX
(RegACCfg5[0])
VREFP
VREFN
0
AC_R1 (VBATT)
AC_R0 (VSS)
1
AC_R3 (VREF)
AC_R2 (VSS)
Table 3 - Analog Reference Input Selection
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