AD7708 datasheet(24/44 Pages) AD

24 / 44 page

REV. 0

–24–

AD7708/AD7718

Table XI. Registers—Quick Reference Guide (continued)

Power-On/Reset

Type

Size

Default Value

Function

AD7718

Offset Register

Read/Write

24 Bits

800 000 Hex

Contains a 24-bit word which is the offset calibration

coefficient for the part. The contents of this register

are used to provide offset correction on the output

from the digital filter. There are five Offset Registers

on the part and these are associated with input chan-

nels as outlined in the ADCCON register.

AD7718

Gain Register

Read/Write

24 Bits

5XXXX5 Hex

Contains a 24-bit word which is the gain calibration

coefficient for the part. The contents of this register

are used to provide gain correction on the output

from the digital filter. There are five Gain Registers

on the part and these are associated with input chan-

nels as outlined in the ADCCON register.

AD7708

Offset Register

Read/Write

16 Bits

8000 Hex

Contains a 16-bit word which is the offset calibration

coefficient for the part. The contents of this register

are used to provide offset correction on the output

from the digital filter. There are five Offset Registers

on the part and these are associated with input chan-

nels as outlined in the ADCCON register.

AD7708

Gain Register

Read/Write

16 Bits

5XXX Hex

Contains a 16-bit word which is the gain calibration

coefficient for the part. The contents of this register

are used to provide gain correction on the output

from the digital filter. There are five Gain Registers

on the part and these are associated with input chan-

nels as outlined in the ADCCON register.

AD7708

ID Register

Read

8 Bits

5X Hex

Contains an 8-bit byte which is the identifier for

the part.

AD7718

ID Register

Read

8 Bits

4X Hex

Contains an 8-bit byte which is the identifier for

the part.

Test Registers

Read/Write

16 Bits

0000 Hex

Controls the test modes of the part that are used

when testing the part. The user is advised not to

change the contents of these registers.

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