CDB4391(2000) Ver la hoja de datos (PDF) - Cirrus Logic

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CDB4391
(Rev.:2000)

24-Bit, 192 kHz Stereo DAC with Volume Control

Cirrus Logic 

CS4391

4.2 VOLUME AND MIXING CONTROL (ADDRESS 02H)

7

A=B

6

5

4

3

2

1

0

Soft

Zero Cross

ATAPI4

ATAPI3

ATAPI2

ATAPI1

ATAPI0

4.2.1 Channel A Volume = Channel B Volume (Bit 7)

Function:

The AOUTA and AOUTB volume levels are independently controlled by the A and the B Channel Vol-

ume Control Bytes when this function is disabled. The volume on both AOUTA and AOUTB are de-

termined by the A Channel Volume Control Byte and the B Channel Byte is ignored when this function

is enabled.

4.2.2 Soft Ramp or Zero Cross Enable (Bits 6:5)

Function:

Soft Ramp Enable

Soft Ramp allows 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

periods.

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 between 512 and 1024 sample periods (10.7 ms to 21.3 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.

Soft Ramp and Zero Cross Enable

Soft Ramp and Zero Cross Enable dictates that signal level changes, either by attenuation changes

or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level

change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 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.

See Table 5

4.2.3 ATAPI Channel Mixing and Muting (Bits 4:0)

Function:

The CS4391 implements the channel mixing functions of the ATAPI CD-ROM specification.

See Table 6

4.3 CHANNEL A VOLUME CONTROL - ADDRESS 03H

See 4.4 Channel B Volume Control - Address 04h

18

DS335PP3

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