CS4392 查看數據表（PDF） - Cirrus Logic

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CS4392

24-Bit, 192 kHz Stereo DAC with Volume Control

Cirrus Logic 

CS4392

6.2 Volume and Mixing Control (Address 02h)

7

A=B

6

5

4

3

Soft

Zero Cross

ATAPI4

ATAPI3

2

ATAPI2

1

ATAPI1

0

ATAPI0

6.2.1 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.

6.2.2 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 mon-

itored 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 12

SOFT

0

0

1

1

ZERO

0

1

0

1

Mode

Changes to affect immediately

Zero Cross enabled

Soft Ramp enabled (default)

Soft Ramp and Zero Cross enabled

Table 12. Soft Cross or Zero Cross Mode Selection

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

Function:

The CS4392 implements the channel mixing functions of the ATAPI CD-ROM specification. See

Table 13 on page 21

20

DS459PP3

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