wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 33

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

Production Data
w
01001
Digital
Attenuation
DACL1
01010
Digital
Attenuation
DACR1
01011
Digital
Attenuation
DACL2
01100
Digital
Attenuation
DACR2
01101
Digital
Attenuation
DACL3
01110
Digital
Attenuation
DACR3
REGISTER
ADDRESS
BIT
7:0
7:0
7:0
7:0
7:0
7:0
8
8
8
8
8
8
RDA1[6:0]
RDA2[7:0]
RDA3[7:0]
LDA1[7:0]
LDA2[7:0]
LDA3[7:0]
UPDATE
UPDATE
UPDATE
UPDATE
UPDATE
UPDATE
Register bits L1A and R1A control the left and right channel attenuation of DAC 1. Register bits L2A
and R2A control the left and right channel attenuation of DAC 2. Register bits L3A and R3A control
the left and right channel attenuation of DAC 3. Register bits L4A and R4A control the left and right
channel attenuation of DAC 4.
channels.
Table 8 shows how the attenuation levels are selected from the 7-bit words.
Table 11 Analogue Volume Control Attenuation Levels
DAC DIGITAL VOLUME CONTROL
The DAC volume may also be adjusted in the digital domain using independent digtal attenuation
control registers
DAC ANALOGUE OUTPUT ATTENUATION
LABEL
L/RA
1A(hex)
1B(hex)
7D(hex)
7E(hex)
00(hex)
7F(hex)
:
:
x
[6:0]
Not latched
Not latched
Not latched
Not latched
Not latched
Not latched
DEFAULT
11111111
11111111
11111111
11111111
11111111
11111111
(0dB)
(0dB)
(0dB)
(0dB)
(0dB)
(0dB)
Digital Attenuation data for Left channel DACL1 in 0.5dB steps. See
Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR1 in 0.5dB steps.
See Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Left channel DACL2 in 0.5dB steps. See
Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR2 in 0.5dB steps.
See Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Left channel DACL3 in 0.5dB steps. See
Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR3 in 0.5dB steps.
See Table 12
Controls simultaneous update of all Attenuation Latches
ATTENUATION LEVEL
Register bits MASTA can be used to control attenuation of all
-∞dB (mute)
-∞dB (mute)
0: Store LDA1 in intermediate latch (no change to output)
1: Store LDA1 and update attenuation on all channels
0: Store RDA1 in intermediate latch (no change to output)
1: Store RDA1 and update attenuation on all channels.
0: Store LDA2 in intermediate latch (no change to output)
1: Store LDA2 and update attenuation on all channels.
0: Store RDA2 in intermediate latch (no change to output)
1: Store RDA2 and update attenuation on all channels.
0: Store LDA3 in intermediate latch (no change to output)
1: Store LDA3 and update attenuation on all channels.
0: Store RDA3 in intermediate latch (no change to output)
1: Store RDA3 and update attenuation on all channels.
-100dB
-2dB
-1dB
0dB
:
:
DESCRIPTION
PD Rev 4.2 March 2008
WM8770
33