CS4351 查看數據表（PDF） - Cirrus Logic

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CS4351

192 kHz Stereo DAC with 2 Vrms Line Out

Cirrus Logic 

6.5.1

CS4351

Digital Volume Control (VOL7:0) Bits 7-0

Default = 00h (0 dB)

Function:

The Digital Volume Control registers allow independent control of the signal levels in 1/2 dB increments

from 0 to -127.5 dB. Volume settings are decoded as shown in Table 9. The volume changes are imple-

mented as dictated by the Soft and Zero Cross bits in the Power and Muting Control register.

The actual attenuation is determined by taking the decimal value of the volume register and multiplying

by 6.02/12.

Binary Code

00000000

00000001

00000110

11111111

Decimal Value

0

1

6

255

Volume Setting

0 dB

-0.5 dB

-3.0 dB

-127.5 dB

Table 9. Example Digital Volume Settings

6.6 Ramp and Filter Control - Register 07h

7

SZC1

1

6

SZC0

0

5

RMP_UP

1

4

RMP_DN

1

3

Reserved

0

2

FILT_SEL

0

1

Reserved

0

0

Reserved

1

6.6.1

Soft Ramp and Zero Cross Control (SZC1:0) Bits 7-6

Default = 10

SZC1 SZC0

0

0

0

1

1

0

1

1

Description

Immediate Change

Zero Cross

Soft Ramp

Soft Ramp on Zero Crossings

Function:

Immediate Change

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

Zero Cross

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 time-

out 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 PCM

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

ing, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock periods.

28

DS566F1

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