AD7147A Analog Devices, AD7147A Datasheet - Page 53

• Manufacturer Part Number: AD7147A
• Manufacturer: Analog Devices

Specifications of AD7147A

• Resolution (bits): 16bit
• # Chan: 13
• Sample Rate: 111SPS
• Interface: I²C/Ser 2-Wire,Ser,SPI
• Analog Input Type: Capacitive
• Ain Range: ± 8 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

Table 37. STAGEx_AFE_OFFSET Register Description (x = 0 to 11)
Data Bit
[5:0]
[6]
[7]
[13:8]
[14]
[15]
1
Table 38. STAGEx_SENSITIVITY Register Description (x = 0 to 11)
Data Bit
[3:0]
[6:4]
[7]
[11:8]
[14:12]
[15]
1
X = don’t care.
X = don’t care.
Default
Value
X
X
X
X
X
X
Default
Value
X
X
X
X
X
X
1
1
Type
R/W
R/W
R/W
R/W
Type
R/W
R/W
R/W
R/W
R/W
R/W
Name
NEG_AFE_OFFSET
Unused
NEG_AFE_OFFSET_SWAP
POS_AFE_OFFSET
Unused
POS_AFE_OFFSET_SWAP
Name
NEG_THRESHOLD_SENSITIVITY
NEG_PEAK_DETECT
Unused
POS_THRESHOLD_SENSITIVITY
POS_PEAK_DETECT
Unused
Rev. B | Page 53 of 68
Negative AFE offset setting (20 pF range)
Negative AFE offset swap control
Positive AFE offset swap control
Positive peak detect setting
Description
1 LSB value = 0.32 pF of offset
Set to 0
0 = NEG_AFE_OFFSET applied to CDC negative input
1 = NEG_AFE_OFFSET applied to CDC positive input
Positive AFE offset setting (20 pF range)
1 LSB value = 0.32 pF of offset
Set to 0
0 = POS_AFE_OFFSET applied to CDC positive input
1 = POS_AFE_OFFSET applied to CDC negative input
Description
Negative threshold sensitivity control
0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08%
0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15%
0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22%
1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28%
1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32%
Negative peak detect setting
000 = 40% level, 001 = 50% level, 010 = 60% level
011 = 70% level, 100 = 80% level, 101 = 90% level
Set to 0
Positive threshold sensitivity control
0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08%
0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15%
0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22%
1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28%
1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32%
000 = 40% level, 001 = 50% level, 010 = 60% level
011 = 70% level, 100 = 80% level, 101 = 90% level
Set to 0
AD7147A