AD7747 View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

AD7747

24-Bit Capacitance-to-Digital Converter with Temperature Sensor

Analog Devices 

AD7747

CAP DAC A REGISTER

Address Pointer 0x0B, Default Value 0x00

Capacitive DAC setup.

Table 19. Cap DAC A Register Bit Map

Bit

Bit 7

Bit 6

Mnemonic

DACAENA –

Default

0

0

Bit 5

Bit 4

Bit 3

Bit 2

DACA—6-Bit Value

0x00

Bit 1

Bit 0

Table 20.

Bit Mnemonic

7

DACAENA

6

–

5 to 1 DACA

Description

DACAENA = 1 connects capacitive DACA to the positive capacitance input.

This bit must be 0 for proper operation.

DACA value, Code 0x00 ≈ 0 pF, Code 0x3F ≈ full range.

CAP DAC B REGISTER

Address Pointer 0x0C, Default Value 0x00

Capacitive DAC setup.

Table 21. Cap DAC B Register Bit Map

Bit

Bit 7

Bit 6

Mnemonic

DACBENB –

Default

0

0

Bit 5

Bit 4

Bit 3

Bit 2

DACB—6-Bit Value

0x00

Bit 1

Bit 0

Table 22.

Bit Mnemonic

7

DACBENB

6

–

5 to 1 DACB

Description

DACBENB = 1 connects capacitive DACB to the negative capacitance input.

This bit must be 0 for proper operation.

DACB value, Code 0x00 ≈ 0 pF, Code 0x3F ≈ full range.

Rev. 0 | Page 19 of 28

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