Cirrus-logic CRD5376 User Manual download pdf (Page 38)

CRD5376

38 DS612RD2

3.3.5 Gain/Offset

The Gain / Offset sub-panel controls the digital filter GAIN and OFFSET registers for each channel.

The OFFSET and GAIN registers can be manually written with any 24-bit 2’s complement value from

0x800000 to 0x7FFFFF. The USEGR, USEOR, ORCAL, and EXP[4:0] values enable gain correction, off-

set correction, and offset calibration in the digital filter.

The offset calibration routine built into the digital filter is enabled by writing the ORCAL and EXP[4:0] bits.

The EXP[4:0] value can range from 0x00 to 0x18 and represents an exponential shift of the calibration

feedback, as described in the digital filter data sheet. Offset calibration results are automatically written to

the OFFSET registers and remain there, even after offset calibration is disabled.

Control Description

Gain Displays the digital filter GAIN1 to GAIN4 registers.

Offset Displays the digital filter OFFSET1 to OFFSET4 registers.

Read Reads values from the GAIN and OFFSET registers.

Write Writes values to the GAIN and OFFSET registers.

USEGR Enables gain correction. When enabled, output samples are gained down by the

value in the GAIN register.(Output = GAIN / 0x7FFFFF).

USEOR Enables offset correction. When enabled, output samples are offset by the value in

the OFFSET register. (Output = Sample - OFFSET).

ORCAL Enables offset calibration using the exponent value from the EXP[4:0] control.

Results are automatically written to the OFFSET registers as they are calculated.

EXP[4:0] Sets the exponential value used by offset calibration.

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Cirrus-logic CRD5376 User Manual Page 38