MAX9879 Maxim Integrated Products, MAX9879 Datasheet - Page 23

• Manufacturer Part Number: MAX9879
• Description: Stereo Class D Audio Subsystem
• Manufacturer: Maxim Integrated Products

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The device has a separate volume control for left head-
phone, right headphone, and speaker amplifiers. The
1 = MAX9879 operational.
0 = MAX9879 in low-power shutdown mode.
Table 4. Volume Control Settings
Table 3. Speaker/Left Headphone/Right Headphone Volume Control
Table 5. Output Mode Control
CODE
REGISTER
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
REGISTER
0x01
0x02
0x03
0x04
B4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
B3
B7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
______________________________________________________________________________________
0
0
0
SHDN
_VOL
B7
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
with DirectDrive Headphone Amplifier
B6
0
0
0
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BYPASS
B6
Shutdown (S S H H D D N N )
B0
Volume Control
Stereo Class D Audio Subsystem
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
B5
0
0
0
GAIN (dB)
MUTE
-75
-71
-67
-63
-59
-55
-51
-47
-44
-41
-38
-35
-32
-29
-26
B5
0
B4
ENB
B4
total system gain is a combination of the input gain, the
volume control, and the output amplifier gain. Table 4
shows the volume settings for each volume control.
SHDN is an active-low shutdown bit that overrides all
settings and places the entire device in low-power shut-
down mode. The I
down mode and bypass mode remains operational.
CODE
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
B3
ENA
B4
B3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
HPLVOL (Table 4)
HPRVOL (Table 4)
SVOL (Table 4)
B2
B3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
2
C interface is fully active in this shut-
LSPK
B2
EN
_VOL
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
B1
B1
RSPK
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
B1
EN
B0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
B0
GAIN (dB)
HPEN
B0
-23
-21
-19
-17
-15
-13
-11
-9
-7
-6
-5
-4
-3
-2
-1
0
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