AD7148 datasheet(46/56 Pages) AD

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AD7148

Rev. 0 | Page 46 of 56

Table 40. STAGEx Detailed CIN7 Connection Setup Description (x = 0 to 7)

Data

Bit

Default

Value

Type

Mnemonic

Description

[1:0]

R/W

CIN7_CONNECTION_SETUP

CIN7 connection setup

00 = CIN7 not connected to CDC inputs

01 = CIN7 connected to CDC negative input

10 = CIN7 connected to CDC positive input

11 = CIN7 connected to BIAS (connect unused CINx inputs)

[12:2]

Unused

Set unused register bits to 0

[13:12]

R/W

SE_CONNECTION_SETUP

Single-ended measurement connection setup

00 = do not use

01 = use when one CIN is connected to CDC positive input,

single-ended measurements only

10 = use when one CIN is connected to CDC negative input,

single-ended measurements only

11 = differential connection to CDC

[14]

R/W

NEG_AFE_OFFSET_DISABLE

Negative AFE offset enable control

0 = enable

1 = disable

[15]

R/W

POS_AFE_OFFSET_DISABLE

Positive AFE offset enable control

0 = enable

1 = disable

Table 41. STAGEx Detailed Offset Control Description (x = 0 to 7)

Data

Bit

Default

Value

Type

Mnemonic

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

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