Datasheet

AD7194 Data Sheet

Rev. A | Page 28 of 56

OFFSET REGISTER

RS2, RS1, RS0 = 110; Power-On/Reset = 0x800000)

The offset register holds the offset calibration coefficient for the

ADC. The power-on reset value of the offset register is 0x800000.

The register is a 24-bit read/write register. It is used in conjunc-

tion with the full-scale register to form a register pair. The

power-on reset value is automatically overwritten if an internal

or system zero-scale calibration is initiated by the user. The

AD7194 must be placed in power-down mode or idle mode

when writing to the offset register.

FULL-SCALE REGISTER

RS2, RS1, RS0 = 111; Power-On/Reset = 0x5XXXX0

The full-scale register is a 24-bit register that holds the full-scale

calibration coefficient for the ADC. The full-scale register is

a read/write register. However, when writing to the full-scale

mode. The register is configured at power-on with a factory

calibrated full-scale calibration coefficient, the calibration being

performed at gain = 1. Therefore, every device has different

default coefficients. The default value is automatically over-

written if an internal or system full-scale calibration is initiated

by the user or if the full-scale register is written to.