CS53L21 datasheet(46/66 Pages) CIRRUS

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DS700PP1

CS53L21

ADCX High-Pass Filter Freeze (ADCX_HPFRZ)

Default: 0

0 - Continuous DC Subtraction

1 - Frozen DC Subtraction

Function:

The high-pass filter works by continuously subtracting a measure of the DC offset from the output of the

decimation filter. If the ADCx_HPFRZ bit is taken high during normal operation, the current value of the DC

offset is frozen, and this DC offset will continue to be subtracted from the conversion result. For DC mea-

surements, this bit must be set to ‘1’. See “ADC Digital Filter Characteristics” on page 14.

Soft Ramp CHX Control (SOFTX)

Default: 0

0 - Disabled

1 - Enabled

Function:

Soft Ramp allows level changes to be implemented via an incremental ramp. ADCx_ATT[7:0] digital atten-

uation changes are ramped from the current level to the new level at a rate of 0.125 dB per LRCK period.

PGAx_VOL[4:0] gain changes are ramped in 0.5 dB steps every 16 LRCK periods.

Soft Ramp & Zero Cross Enabled

When used in conjunction with the ZCROSSx bit, the PGAx_VOL[4:0] gain changes will occur in 0.5 dB

steps and be implemented on a signal zero crossing.

Zero Cross CHX Control (ZCROSSX)

Default: 0

0 - Disabled

1 - Enabled

Function:

Zero Cross Enable dictates that signal level changes will occur on a signal zero crossing to minimize audible

artifacts. The requested level change will occur after a timeout period of 1024 sample periods (approximate-

ly 10.7 ms at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function

is independently monitored and implemented for each channel.

Soft Ramp & Zero Cross Enabled

When used in conjunction with the SOFTx bit, the PGAx_VOL[4:0] gain changes will occur in 0.5 dB steps

and be implemented on a signal zero crossing.

The ADC Attenuator ADCx_ATT[7:0] is not affected by the ZCROSSx bit.

SOFTx

ZCROSSx

Analog PGA Volume

(PGAx_VOL[4:0])

Digital Attenuator (ADCx_ATT[7:0])

Volume changes immediately.

Volume changes at next zero cross time.

Volume changes immediately.

Volume changes in 0.5 dB steps.

Change volume in 0.125 dB steps.

Volume changes in 0.5 dB steps at every

signal zero-cross.

Change volume in 0.125 dB steps.

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