CDB5374 Cirrus Logic Inc, CDB5374 Datasheet - Page 41

• Manufacturer Part Number: CDB5374
• Description: Audio Modules & Development Tools 2-Ch DS Modulator & Hydrophone Demo Brd
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5374

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.5
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.
DS862DB1
Gain
Offset
Read
Write
USEGR
USEOR
ORCAL
EXP[4:0]
Control
Gain/Offset
Displays the digital filter GAIN1 to GAIN4 registers.
Displays the digital filter OFFSET1 to OFFSET4 registers.
Reads values from the GAIN and OFFSET registers.
Writes values to the GAIN and OFFSET registers.
Enables gain correction. When enabled, output samples are gained down by the
value in the GAIN register.(Output = GAIN / 0x7FFFFF).
Enables offset correction. When enabled, output samples are offset by the value in
the OFFSET register. (Output = Sample - OFFSET).
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.
Sets the exponential value used by offset calibration.
Description
CDB5374
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