www.semtech.com/products/ Page 24 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725C ZoomingADC fo" />
參數(shù)資料
型號: SX8725CWLTDT
廠商: Semtech
文件頁數(shù): 17/68頁
文件大?。?/td> 0K
描述: IC DAS ADC 16BIT I2C/SRL
標(biāo)準(zhǔn)包裝: 1
系列: ZoomingADC™
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類型: 差分
輸出類型: 數(shù)字
接口: I²C
安裝類型: 表面貼裝
封裝/外殼: 12-WDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 12-MLPD-EP(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: SX8725CWLTDTDKR
www.semtech.com/products/
Page 24
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
The output of PGA3 is also the input of the ADC. Thus, similarly to PGA2, we find that the voltage entering the ADC is
given by:
where GD3 and GDOFF3 are respectively the gain and offset of PGA3 (in V/V). The control words are Pga3Gain[6:0] and
Pga3Offset[6:0].
To remain within the signal compliance of the PGA stages (no saturation), the condition:
must be verified.
To remain within the signal compliance of the ADC (no saturation), the condition:
must be verified.
...
1000001
-1/12 (=-0.083)
1000000
64/12
1000010
-2/12
...
1111111
127/12 (=10.58)
1010000
-16/12
...
1100000
-32/12
...
1111111
-63/12 (=-5.25)
Equation 7
Equation 8
Equation 9
Table 13. PGA3 Gain and Offset Settings
Pga3Gain bitfield
(RegACCfg3[6:0])
PGA3 Gain
GD3 [V/V]
Pga3Offset bitfield
(RegACCfg4[6:0])
PGA3 Offset
GDOFF3 [V/V]
]
[
3
2
3
,
V
S
GDoff
V
GD
V
REF
D
ADC
IN
=
2
,
2
1
BATT
D
IN
V
<
<
OSR
V
REF
ADC
IN
1
2
,
Not
Recommended
for
New
Designs
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