CS53L32A

22

DS513F1

4.9

LEFT/RIGHT CHANNEL MUTE

Analog I/O Control (address 03h)

Access:

R/W in Two Wire Mode and write only in SPI.

Default:

0 - Disabled

Function:

Digital mute of the left and right channels.

4.10

SOFT RAMP AND ZERO CROSS ENABLE

Analog I/O Control Register (address 03h)

Access:

R/W in Two Wire Mode and write only in SPI.

Default:

11 - Soft Ramp and Zero Cross enabled

Function:

Soft Ramp Enable

Soft Ramp allows level changes, both muting and attenuation, to be implemented via an incremental

ramp. Digital volume control is ramped from the current level to the new level at a rate of 1/8 dB per

left/right clock period. Analog volume control is ramped in 1 dB steps every 8 left/right clock periods

in Base Rate mode, and 1 dB every 16 left/right clock periods in High Rate mode.

Zero Cross Enable

Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will

occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur

after a timeout period of 512 sample periods in BRM or 1024 sample periods in HRM (approximately

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

tion is independently monitored and implemented for each channel.

76543

210

MUTEL

MUTER

SOFT

ZC

RESERVED

INDVC

L=R

HPFREEZE

MUTEL/

MUTER

MODE

0

Disabled

1

Enabled

Table 8. Left/Right Channel Mute Enable

76543

210

MUTEL

MUTER

SOFT

ZC

RESERVED

INDVC

L=R

HPFREEZE