CDB53L21 データシートの表示（PDF） - Cirrus Logic

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CDB53L21

Low Power, Stereo Analog to Digital Converter

Cirrus Logic 

4.4 Signal Processing Engine

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

Software

Controls:

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

CS53L21

INPUTS FROM ADCA

and ADCB

SIGNAL PROCESSING ENGINE (SPE)

MUTE_ADCMIXA

MUTE_ADCMIXB

ADCMIXA_VOL[6:0]

ADCMIXB_VOL[6:0]

+12dB/-51.5dB

0.5dB steps

VOL

ADCA[1:0]

ADCB[1:0]

Channel

Swap

Digital Mix to ADC

Serial Interface

Figure 12. Signal Processing Engine

4.4.1

4.4.2

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.

Software

Controls:

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

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:

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

28

DS700PP1

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