AD7148 Analog Devices, AD7148 Datasheet - Page 46

• Manufacturer Part Number: AD7148
• Manufacturer: Analog Devices

Specifications of AD7148

• Resolution (bits): 16bit
• # Chan: 8
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: ± 8 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

AD7148
Table 40. STAGEx Detailed CIN7 Connection Setup Description (x = 0 to 7)
Data
Bit
[1:0]
[12:2]
[13:12]
[14]
[15]
Table 41. STAGEx Detailed Offset Control Description (x = 0 to 7)
Data
Bit
[5:0]
[6]
[7]
[13:8]
[14]
[15]
Default
Value
X
X
X
X
X
Default
Value
X
X
X
X
X
X
Type
R/W
R/W
R/W
R/W
Type
R/W
R/W
R/W
R/W
Mnemonic
NEG_AFE_OFFSET
Unused
NEG_AFE_OFFSET_SWAP
POS_AFE_OFFSET
Unused
POS_AFE_OFFSET_SWAP
Mnemonic
CIN7_CONNECTION_SETUP
Unused
SE_CONNECTION_SETUP
NEG_AFE_OFFSET_DISABLE
POS_AFE_OFFSET_DISABLE
Rev. A | Page 46 of 56
Description
Negative AFE offset setting (20 pF range)
Set to 0
Negative AFE offset swap control
Positive AFE offset setting (20 pF range)
Set to 0
Positive AFE offset swap control
CIN7 connection setup
Set unused register bits to 0
Single-ended measurement connection setup
Negative AFE offset enable control
Positive AFE offset enable control
Description
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)
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
0 = enable
1 = disable
0 = enable
1 = disable
1 LSB value = 0.32 pF of offset
0 = NEG_AFE_OFFSET applied to CDC negative input
1 = NEG_AFE_OFFSET applied to CDC positive input
1 LSB value = 0.32 pF of offset
0 = POS_AFE_OFFSET applied to CDC positive input
1 = POS_AFE_OFFSET applied to CDC negative input