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WM8971LEFL/R 数据表(PDF) 54 Page - Wolfson Microelectronics plc

部件名 WM8971LEFL/R
功能描述  STEREO CODEC FOR PORTABLE AUDIO APPLLICATIONS
PDF  56 Pages
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制造商  WOLFSON [Wolfson Microelectronics plc]
网页  http://www.wolfsonmicro.com
标志 WOLFSON - Wolfson Microelectronics plc

WM8971LEFL/R 数据表(HTML) 54 Page - Wolfson Microelectronics plc

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WM8971L
Advanced Information
w
AI Rev 3.0 March 2004
54
input from charging to a high voltage which may damage the microphone on connection. R1 and R2
should be large so as not to attenuate the signal from the microphone, which can have source
impedance greater than 2kOhm. C1 together with the source impedance of the microphone and the
WM8971L input impedance forms an RF filter. C2 is a DC blocking capacitor to allow the microphone
to be biased at a different DC voltage to the MICIN signal.
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS
To minimise 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 WM8971L 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, then wait for time TBD
•
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, then wait for time TBD.
•
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
MO
Stereo Headphone Playback
1
1
0
0
0
0
0
1
1
1
1
0
0
0
Stereo Line-in Record
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Stereo Microphone Record
1
1
1
1
1
1
1
0
0
0
0
0
0
0
Mono Microphone Record
1
1
1
0
1
0
1
0
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
0
Phone Call
1
1
1
0
0
0
1
0
0
1
1
0
0
1
Speaker Phone Call [ROUT2INV = 1]
1
1
1
0
0
0
1
0
0
0
0
1
1
1
Record Phone Call [L channel = mic with
boost, R channel = RX, enable mono mix]
1
1
1
1
1
1
1
0
0
1
1
0
0
1
Table 41 Register Settings for Power Management



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