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WM8988 Datasheet(PDF) 54 Page - Wolfson Microelectronics plc

Part # WM8988
Description  Stereo CODEC for Portable Audio Applications
PDF  56 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8988 Datasheet(HTML) 54 Page - Wolfson Microelectronics plc

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WM8988
Production Data
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PD, Rev 4.0, October 2008
54
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS
To minimize any pop or click noise when the system is powered up or down, the following procedures
are recommended.
POWER UP
•
Switch on power supplies. By default the WM8988 is in Standby Mode, the DAC is digitally
muted and the Audio Interface, Line outputs and Headphone outputs are all OFF (DACMU
= 1 Power Management registers 1 and 2 are all zeros).
•
Enable Vmid and VREF.
•
Enable DACs as required
•
Enable line and / or headphone output buffers as required.
•
Set DACMU = 0 to soft-un-mute the audio DACs.
POWER DOWN
•
Set DACMU = 1 to soft-mute the audio DACs.
•
Disable all output buffers.
•
Switch off the power supplies.
POWER MANAGEMENT EXAMPLES
POWER MANAGEMENT (1)
POWER MANAGEMENT (2)
PGAs
ADCs
DACs
Output Buffers
OPERATION MODE
PGL
PGR
ADL
ADR
MBI
DAL
DAR
LO1
RO1
LO2
RO2
Stereo Headphone Playback
1
0
0
0
0
0
0
1
1
1
1
0
0
Stereo Line-in Record
1
1
1
1
1
1
0
0
0
0
0
0
0
Stereo Microphone Record
1
1
1
1
1
1
1
0
0
0
0
0
0
Mono Microphone Record
1
1
1
0
1
0
1
0
0
0
0
0
0
Stereo Line-in to Headphone Out
1
1
0
0
0
0
0
0
0
1
1
0
0
Table 45 Register Settings for Power Management



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