WM8776SEFT/V Wolfson Microelectronics, WM8776SEFT/V Datasheet - Page 28

• Manufacturer Part Number: WM8776SEFT/V
• Description: Audio CODECs Stereo CODEC with 5-Ch Mux
• Manufacturer: Wolfson Microelectronics

Specifications of WM8776SEFT/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8776
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ADC MUTE
Each ADC channel also has an individual mute control bit, which mutes the input to the ADC PGA.
By setting the LRBOTH bit (reg22, bit 8) both channels can be muted simultaneously.
DE-EMPHASIS MODE
The De-emphasis filter for the DAC is enabled under the control of DEEMP.
Refer to Figure 35, Figure 36, Figure 37, Figure 38, Figure 39 and Figure 40 for details of the De-
Emphasis modes at different sample rates.
POWERDOWN MODE AND ADC/DAC DISABLE
Setting the PDWN register bit immediately powers down the WM8776, including the references,
overriding all other powerdown control bits. All trace of the previous input samples is removed, but all
control register settings are preserved. When PDWN is cleared, the digital filters will be re-initialised.
It is recommended that the 5-channel input mux and buffer, ADC and DAC are powered down before
setting PDWN.
The ADC, DAC and HEADPHONE PGA’S may also be powered down by setting the ADCD and
DACD disable bits. Setting ADCD will disable the ADC and select a low power mode. The ADC
digital filters will be reset and will reinitialise when ADCD is reset. The DAC has a separate disable
DACD. Setting DACD will disable the DAC, mixer and output PGAs. Resetting DACD will reinitialise
the digital filters.
The analogue audio inputs and outputs can also be individually powered down by setting the relevant
bits in the powerdown register.
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
Powerdown Control
Powerdown Control
DAC De-emphasis
ADC Mute Right
ADC Mute Left
R13 (0Dh)
R13 (0Dh)
R21 (15h)
R21 (15h)
0010101
0001111
R9 (09h)
0001001
0001101
0001101
Control
BIT
BIT
BIT
BIT
7
6
0
0
1
2
3
MUTERA
MUTELA
LABEL
PDWN
DEEMPH
ADCPD
DACPD
LABEL
LABEL
HPPD
LABEL
DEFAULT
DEFAULT
DEFAULT
DEFAULT
0
0
0
0
0
1
0
Power Down Mode Select:
ADC Powerdown:
Headphone output/PGA Power
down :
0 : HP out enabled
1 : HP out disabled
ADC Mute select
ADC Mute select
DAC Powerdown:
De-emphasis mode select:
0 : Normal Mode
1: Power Down Mode
0 : Normal Operation
1: mute ADC left
0 : Normal Operation
1: mute ADC right
0 : Normal Mode
1: Power Down Mode
0 : Normal Mode
1: Power Down Mode
0 : Normal Mode
1: De-emphasis Mode
PD, Rev 4.1, September 2008
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
Production Data
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