MAX9875 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
MFG CO.
MAX9875
Maxim Integrated
MAX9875 Datasheet PDF : 30 Pages
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Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Table 3. Speaker/Left Headphone/Right Headphone Volume Control
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
0x01
0
0
0
SVOL (Table 4)
0x02
0
0
0
HPLVOL (Table 4)
0x03
0
0
0
HPRVOL (Table 4)
Volume Control
The device has a separate volume control for left head-
phone, right headphone, and speaker amplifiers. The
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.
Table 4. Volume Control Settings
_VOL
CODE
GAIN (dB)
B4 B3 B2 B1 B0
0
0
0
0
0
0
MUTE
1
0
0
0
0
1
-75
2
0
0
0
1
0
-71
3
0
0
0
1
1
-67
4
0
0
1
0
0
-63
5
0
0
1
0
1
-59
6
0
0
1
1
0
-55
7
0
0
1
1
1
-51
8
0
1
0
0
0
-47
9
0
1
0
0
1
-44
10
0
1
0
1
0
-41
11
0
1
0
1
1
-38
12
0
1
1
0
0
-35
13
0
1
1
0
1
-32
14
0
1
1
1
0
-29
15
0
1
1
1
1
-26
_VOL
CODE
GAIN (dB)
B4 B3 B2 B1 B0
16
1
0
0
0
0
-23
17
1
0
0
0
1
-21
18
1
0
0
1
0
-19
19
1
0
0
1
1
-17
20
1
0
1
0
0
-15
21
1
0
1
0
1
-13
22
1
0
1
1
0
-11
23
1
0
1
1
1
-9
24
1
1
0
0
0
-7
25
1
1
0
0
1
-6
26
1
1
0
1
0
-5
27
1
1
0
1
1
-4
28
1
1
1
0
0
-3
29
1
1
1
0
1
-2
30
1
1
1
1
0
-1
31
1
1
1
1
1
0
Table 5. Output Mode Control
REGISTER
B7
B6
0x04
SHDN
0
B5
B4
OSC (Table 6 )
B3
B2
B1
B0
OUTMODE (Table 7)
1 = MAX9875 operational.
Shutdown (SHDN)
0 = MAX9875 in low-power shutdown mode.
SHDN is an active-low shutdown bit that overrides all
settings and places the entire device in low-power shut-
down mode. The I2C interface is fully active in this shut-
down mode. All register settings are preserved while in
shutdown.
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