wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 35

• Manufacturer Part Number: wm8770
• Description: 24-bit, 192khz 8-channel Codec With Volume Control
• Manufacturer: Wolfson Microelectronics plc

Production Data
11001
Attenuation
11010
Attenuation
ADCR
w
ADCL
REGISTER
ADDRESS
BIT
4:0
4:0
5
6
5
6
RAG[4:0]
LAG[4:0]
LRBOTH
LRBOTH
LABEL
MUTE
MUTE
DAC OUTPUT PHASE
The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted
ADC GAIN CONTROL
Control bits LAG[4:0] and RAG[4:0] control the ADC input gain, allowing the user to attenuate the
ADC input signal to match the full-scale range of the ADC. The gain is independently adjustable on
left and right inputs. Left and right inputs may also be independently muted. The LRBOTH control bit
allows the user to write the same attenuation value to both left and right volume control registers. The
ADC volume and mute also applies to the bypass signal path.
Registers LAG and RAG control the left and right channel gain into the stereo ADC in 1dB steps from
+19dB to –12dB Table 8 shows how the attenuation levels are selected from the 5-bit words.
Table 13 ADC Gain Control
ADC INPUT GAIN
10010
DAC Phase
REGISTER
ADDRESS
L/RAG[6:0]
01100
11111
0
:
:
DEFAULT
01100
01100
(0dB)
(0dB)
0
0
0
0
BIT
7:0
Attenuation data for Left channel ADC gain in 1dB steps. See Table
13
Mute for Left channel ADC:
Setting LRBOTH will write the same gain value to LAG[4:0] and
RAG[4:0]
Attenuation data for right channel ADC gain in 1dB steps. See Table
13
Mute for RIght channel ADC:
Setting LRBOTH will write the same gain value to RAG[4:0] and
LAG[4:0]
ATTENUATION LEVEL
LABEL
PH[7:0]
0: Mute off
1: Mute on
0: Mute off
1: Mute on
+19dB
-12dB
0dB
:
:
DEFAULT
00000000
DESCRIPTION
Bit
0
1
2
3
4
5
6
7
DESCRIPTION
DAC
DAC1L
DAC1R
DAC2L
DAC2R
DAC3L
DAC3R
DAC4L
DAC4R
PD Rev 4.2 March 2008
WM8770
Phase
1 = invert
1 = invert
1 = invert
1 = invert
1 = invert
1 = invert
1 = invert
1 = invert
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