WM8900LGEFK/RV Wolfson Microelectronics, WM8900LGEFK/RV Datasheet - Page 43

• Manufacturer Part Number: WM8900LGEFK/RV
• Description: Audio CODECs Ultra Low Power Hi-Fi CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8900LGEFK/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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DIGITAL SIDETONE
A digital sidetone is available when ADCs and DACs are operating at the same sample rate. Digital
data from either left or right ADC can be mixed with the audio interface data on the left and right
DAC channels. Sidetone data is taken from the ADC high pass filter output, to reduce low
frequency noise in the sidetone (e.g. wind noise or mechanical vibration).
The digital sidetone will not function when ADCs and DACs are operating at different sample rates.
When using the digital sidetone it is recommended that the ADCs are enabled before un-muting
the DACs to prevent pop noise. The DAC volumes and sidetone volumes should be set to an
appropriate level to prevent clipping at the DAC input.
The digital sidetone is controlled as shown in Table 25.
Table 25 Digital Sidetone Control
Table 26 Digital Sidetone Volume
ADCL_DAC_SVOL or
R13 (0Dh)
Digital
Sidetone
REGISTER
ADCR_DAC_SVOL
ADDRESS
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
12:9
8:5
3:2
1:0
BIT
ADCL_DAC_SVOL
[3:0]
ADCR_DAC_SVOL
[3:0]
ADC_TO_DACL
[1:0]
ADC_TO_DACR
[1:0]
Sidetone
Volume
LABEL
-36
-33
-30
-27
-24
-21
-18
-15
-12
-9
-6
-3
0
0
0
0
0000
0000
00
00
DEFAULT
Left Digital Sidetone Volume
(See Table 26 for volume range)
Right Digital Sidetone Volume
(See Table 26 for volume range)
Left DAC Digital Sidetone Source
00 = No sidetone
01 = Left ADC
10 = Right ADC
11 = Reserved
Right DAC Digital Sidetone Source
00 = No sidetone
01 = Left ADC
10 = Right ADC
11 = Reserved
PD, August 2008, Rev 4.0
DESCRIPTION
WM8900
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