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: 28/68页
文件大小: 1718K
代理商: SX8725CWLTDT
www.semtech.com/products/
Page 34
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
where, from Equation 11 and Equation 12, the total PGA gain and offset are respectively:
and:
Equation 20
Equation 21
Table 19.
Basic ADC Relationships (example for: VREF = 5V, OSR = 512, n = 16bits)
ADC Input Voltage
VIN,ADC
% of Full Scale (FS)
Output in LSBs
Hexadecimal Output Code
+2.49505 V
+0.5 x FS
+2
15-1 = 32’767
7FFF
+2.49497 V
...
+2
15-2 = 32’766
7FFE
...
+76.145
μV
...
+1
0001
0
0000
-76.145
μV
...
-1
FFFF
...
-2.49505 V
...
-2
15-1 = -32’767
8001
-2.49513 V
-0.5 x FS
-2
15 = -32’768
8000
Table 20.
Last forced LSBs in conversion output register for resolution settings smaller than 16bits1
1.
(n<16) (RegACOutMsb[7:0] & RegACOutLsb[7:0])
SetOsr[2:0]
SetNelconv = ‘00’
SetNelconv = ‘01’
SetNelconv = ‘10’
SetNelconv = ‘11’
‘000’
1000000000
100000000
10000000
1000000
‘001’
10000000
1000000
100000
10000
‘010’
100000
10000
1000
100
‘011’
1000
100
10
1
‘100’
10
1
-
‘101’
----
‘110’
----
‘111’
----
1
2
3
GD
TOT
=
2
3
GDoff
GD
GDoff
TOT
+
=
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