CDB43L43 Ver la hoja de datos (PDF) - Cirrus Logic

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CDB43L43

Low Voltage, Stereo DAC with Headphone Amp

Cirrus Logic 

CS43L43

5.0 REGISTER DESCRIPTIONS

5.1 POWER AND MUTING CONTROL (ADDRESS 01H)

7

AMUTE

1

6

SZC1

1

5

SZC0

0

4

POR

1

3

RESERVED

0

2

RESERVED

0

1

PDN

1

0

CP_EN

0

5.1.1 AUTO-MUTE (AMUTE) BIT 7

Default = 1

0 - Disabled

1 - Enabled

Function:

The Digital-to-Analog converter output will mute following the reception of 8192 consecutive audio sam-

ples of static 0 or -1. A single sample of non-static data will release the mute. Detection and muting is

done independently for each channel. The quiescent voltage on the output will be retained. The muting

function is affected, similar to volume control changes, by the Soft and Zero Cross bits in the Power and

Muting Control register.

5.1.2 SOFT RAMP AND ZERO CROSS CONTROL (SZC) BIT 5-6

Default = 10

00 - Immediate Change

01 - Zero Cross Digital and Analog

10 - Ramped Digital and Analog

11 - Reserved

Function:

Immediate Change

When Immediate Change is selected all level changes will take effect immediately in one step.

Zero Cross Digital and Analog

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 (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.

Ramped Digital and Analog

Soft Ramp allows digital level changes, both muting and attenuation, to be implemented by incrementally

ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1dB per 8 left/right clock pe-

riods. Analog level changes will occur in 1 dB steps on a signal zero crossing. The analog level change

will occur after a timeout period of 512 sample periods (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.

NOTE: Ramped Digital and Analog is not available in Double-Speed mode.

DS479PP3

15

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