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Data Sheet

AD7147

Table 36. STAGEx_AFE_OFFSET Register Description (x = 0 to 11)

Data Bit

Default

Value

Type

Name

Description

[5:0]

R/W

NEG_AFE_OFFSET

Negative AFE offset setting (20 pF range)

1 LSB value = 0.32 pF of offset

[6]

Unused

Set to 0

[7]

R/W

NEG_AFE_OFFSET_SWAP

Negative AFE offset swap control

0 = NEG_AFE_OFFSET applied to CDC negative input

1 = NEG_AFE_OFFSET applied to CDC positive input

[13:8]

R/W

POS_AFE_OFFSET

Positive AFE offset setting (20 pF range)

1 LSB value = 0.32 pF of offset

[14]

Unused

Set to 0

[15]

R/W

POS_AFE_OFFSET_SWAP

Positive AFE offset swap control

0 = POS_AFE_OFFSET applied to CDC positive input

1 = POS_AFE_OFFSET applied to CDC negative input

Table 37. STAGEx_SENSITIVITY Register Description (x = 0 to 11)

Data Bit

Default

Value

Type

Name

Description

[3:0]

R/W

NEG_THRESHOLD_SENSITIVITY

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%

[6:4]

R/W

NEG_PEAK_DETECT

Negative peak detect setting

000 = 40% level, 001 = 50% level, 010 = 60% level

011 = 70% level, 100 = 80% level, 101 = 90% level

[7]

R/W

Unused

Set to 0

[11:8]

R/W

POS_THRESHOLD_SENSITIVITY

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%

[14:12]

R/W

POS_PEAK_DETECT

Positive peak detect setting

000 = 40% level, 001 = 50% level, 010 = 60% level

011 = 70% level, 100 = 80% level, 101 = 90% level

[15]

R/W

Unused

Set to 0

Rev. E | Page 55 of 70

AD7147 Datasheet(PDF) 56 Page - Analog Devices

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