wm8595 Wolfson Microelectronics plc, wm8595 Datasheet - Page 38

• Manufacturer Part Number: wm8595
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

WM8595
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DIGITAL VOLUME CONTROL
The ADC digital volume can be adjusted between +30dB and -97dB in 0.5dB steps. Left and right
channels can be controlled independently. Volume changes can be applied immediately to each
channel, or volume changes can be written to both channels before writing to an update bit in order
to change the volume in both channels simultaneously.
Volume control includes optional zero cross functionality. When zero cross is enabled, volume
changes are not applied until the output level crosses the DC level of the ADC output. Zero cross
helps to prevent pop and click noise when changing volume settings.
Table 29 ADC Digital Volume Control
ADC_CTRL1
ADCR_VOL
ADCR_VOL
REGISTER
ADCL_VOL
ADCL_VOL
ADDRESS
R16
R17
R16
R17
R13
0Dh
10h
11h
10h
11h
BIT
7:0
7:0
13
8
8
ADCR_VU
ADCL_VU
_VOL[7:0]
_VOL[7:0]
ADC_ZC_
LABEL
ADCR
ADCL
EN
DEFAULT
11000011
11000011
0
0
1
ADC Digital Volume
0000 0000 = Digital mute
0000 0001 = -97dB
0000 0010 = -96.5dB
…0.5dB steps
1100 0011 = 0dB
…0.5dB steps
1111 1110 = +29.5dB
1111 1111 = +30dB
ADC Digital Volume Update
0 = Latch ADC volume setting into Register
Map but do not update volume
1 = Latch ADC volume setting into Register
Map and update left and right channels
simultaneously
ADC Digital Volume Control Zero Cross
Enable
0 = Do not use zero cross, change volume
instantly
1 = Use zero cross, change volume when
data crosses zero
DESCRIPTION
PD, Rev 4.1, April 2010
Production Data
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