CS53L21 datasheet(28/66 Pages) CIRRUS

28 / 66 page

DS700PP1

CS53L21

4.4

Signal Processing Engine

The SPE provides various signal processing functions that apply to the ADC data.

4.4.1

Volume Controls

The digital volume control functions offer independent control over the ADC signal path into the mixer.

The volume controls are programmable to ramp in increments of 0.125 dB at a rate controlled by the soft

ramp/zero cross settings.

The signal paths may also be muted via mute control bits. When enabled, each bit attenuates the signal

to its maximum value. When the mute bit is disabled, the signal returns to the attenuation level set in the

respective volume control register. The attenuation is ramped up and down at the rate specified by the

SPE_SZC[1:0] bits.

4.4.2

Mono Channel Mixer

A channel mixer may be used to create a mix of the left and right channels for the ADC data. This mix

allows the user to produce a MONO signal from a stereo source. The mixer may also be used to imple-

ment a left/right channel swap.

Software

Controls:

“SPE Control (Address 09h)” on page 48

Software

Controls:

“ADCx Mixer Volume Control: ADCA (Address 0Eh) & ADCB (Address 0Fh)” on page 51

Software

Controls:

“Channel Mixer (Address 18h)” on page 51.

VOL

Channel

Swap

+12dB/-51.5dB

0.5dB steps

ADCMIXA_VOL[6:0]

ADCMIXB_VOL[6:0]

MUTE_ADCMIXA

MUTE_ADCMIXB

SIGNAL PROCESSING ENGINE (SPE)

ADCA[1:0]

ADCB[1:0]

INPUTS FROM ADCA

and ADCB

Digital Mix to ADC

Serial Interface

Figure 12. Signal Processing Engine

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