AD7739 datasheet(16/32 Pages) AD

16 / 32 page

AD7739

Data Sheet

Rev. A | Page 16 of 32

CHECKSUM REGISTER

16 Bits, Read/Write Register, Address 0x05

This register is described in the AN-626 Application Note,

Using the AD7732/AD7734/ AD7738/AD7739 Checksum

ADC ZERO-SCALE CALIBRATION REGISTER

24 Bits, Read/Write Register, Address 0x06,

Default Value 0x80 0000

This register holds the ADC zero-scale calibration coefficient. The

value in this register is used in conjunction with the value in the

ADC full-scale calibration register and the corresponding channel

zero-scale and channel full-scale calibration registers to scale

digitally the conversion results of all channels. The value in this

ADC zero-scale self-calibration. Writing this register is possible

in the idle mode only (see the Calibration section for details).

ADC FULL-SCALE CALIBRATION REGISTER

24 Bits, Read/Write Register, Address 0x07,

Default Value 0x80 0000

This register holds the ADC full-scale calibration coefficient.

The value in this register is used in conjunction with the value in

the ADC zero-scale and the corresponding channel zero-scale

and channel full-scale calibration registers to scale digitally the

conversion results of all channels. The value in this register is

updated automatically following the execution of an ADC full-

scale self-calibration. Writing this register is possible in the idle

mode only. Use the ADC full-scale self-calibration only on

+2.5 V and ±2.5 V input voltage ranges (see the Calibration

section for details).

CHANNEL DATA REGISTERS

16-Bit/24-Bit, Read-Only Registers, Address 0x08 to

Address 0x0F, Default Width 16 Bits, Default Value 0x8000

These registers contain the most up-to-date conversion results

corresponding to each analog input channel. The 16-bit or

24-bit data width can be configured by setting the 24/16 bit in

the mode register. The relevant RDY bit in the channel status

returns low once the data register reading begins. The RDY pin

can be configured to indicate when any channel has unread data

or to wait until all enabled channels have unread data. If any

channel data register read operation is in progress when a new

result is updated, no update of the data register occurs. This

avoids having corrupted data. Reading the status registers can

be associated with reading the data registers in the dump mode.

Reading the status registers is always associated with reading

the data registers in the continuous read mode (see the Digital

Interface Description section for details).

CHANNEL ZERO-SCALE CALIBRATION REGISTERS

24 Bits, Read/Write Registers, Address 0x10 to

Address 0x17, Default Value 0x80 0000

These registers hold the particular channel zero-scale

calibration coefficients. The value in these registers is used in

conjunction with the value in the corresponding channel full-

scale calibration register, the ADC zero-scale calibration

scale the particular channel conversion results. The value in this

channel zero-scale system calibration.

The format of the channel zero-scale calibration register is a

sign bit and a 22-bit unsigned value. Writing this register is

possible in the idle mode only (see the Calibration section

for details).

CHANNEL FULL-SCALE CALIBRATION REGISTERS

24 Bits, Read/Write Registers, Address 0x18 to

Address 0x1F, Default Value 0x20 0000

These registers hold the particular channel full-scale calibration

coefficients. The value in these registers is used in conjunction

with the value in the corresponding channel zero-scale

calibration register, the ADC zero-scale calibration register, and

the ADC full-scale calibration register to digitally scale the

particular channel conversion results. The value in this register

is updated automatically following the execution of a channel

full-scale system calibration. Writing this register is possible in

the idle mode only (see the Calibration section for details).

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