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WM8750CLSEFL/R Datasheet(PDF) 62 Page - Wolfson Microelectronics plc

Part # WM8750CLSEFL/R
Description  Stereo CODEC for Portable Audio Applications
PDF  65 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8750CLSEFL/R Datasheet(HTML) 62 Page - Wolfson Microelectronics plc

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WM8750L
Production Data
w
PD, Rev 4.4, August 2012
62
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 WM8750L 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
OPERATION MODE
POWER MANAGEMENT (1)
POWER MANAGEMENT (2)
PGAs
ADCs
DACs
Output Buffers
PGL PGR ADL ADR MBI
DAL DAR LO1 RO1 LO2 RO2
MO HPD
Stereo Headphone Playback
1
0
0
0
0
0
0
1
1
1
1
0
0
0
x
Stereo Line-in Record
1
1
1
1
1
1
0
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
0
Mono Microphone Record
1
1
1
0
1
0
1
0
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
x
Phone Call
1
1
1
0
0
0
1
0
0
1
1
0
0
1
x
Speaker Phone Call [ROUT2INV = 1]
1
1
1
0
0
0
1
0
0
0
0
1
1
1
0
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
x
Table 49 Register Settings for Power Management



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