CS43L21 datasheet(25/63 Pages) CIRRUS

25 / 63 page

DS723A1

CS43L21

4.3.2

Volume Controls

Two digital volume control functions offer independent control of the SDIN signal path into the mixer as

well as a combined control of the mixed signals. The volume controls are programmable to ramp in incre-

ments 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

DAC_SZC[1:0] bits.

4.3.3

Mono Channel Mixer

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

4.3.4

Beep Generator

The Beep Generator generates audio frequencies across approximately two octave major scales. It offers

three modes of operation: Continuous, multiple and single (one-shot) beeps. Sixteen on and eight off

times are available.

Note: The Beep is generated before the limiter and may affect desired limiting performance. If the limiter

function is used, it may be required to set the Beep volume sufficiently below the threshold to prevent the

peak detect from triggering. Since the master volume control, AOUTx_VOL[7:0], will affect the Beep vol-

ume, DAC volume may alternatively be controlled using the PCMMIXx_VOL[6:0] bits.

Software

Controls:

“PCMX Mixer Volume Control: PCMA (Address 10h) & PCMB (Address 11h)” on page 44“AOUTx

Volume Control: AOUTA (Address 16h) & AOUTB (Address 17h)” on page 49“DAC Output Control

(Address 08h)” on page 41

Software

Controls:

“PCM Channel Mixer (Address 18h)” on page 49.

Software

Controls:

“Beep Frequency & Timing Configuration (Address 12h)” on page 45, “Beep Off Time & Volume

(Address 13h)” on page 46, “Beep Configuration & Tone Configuration (Address 14h)” on page 47

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

Figure 9. De-Emphasis Curve

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