MAX97003 Datasheet, PDF (37/48 Pages) Maxim Integrated Products – High-Efficiency, Low-Noise Audio Subsystem

MAX97003
High-Efficiency, Low-Noise Audio Subsystem
Speaker Low-Power Mode
The speaker expander includes a low-power mode that increases power efficiency when a desired audio signal is not
present. When this feature is enabled, the Class D switching output is active only if the speaker volume setting selected
by the expander is above the selected low-power mode threshold. Low-power mode is only available when the speaker
expander is enabled.
Table 9. Speaker Low-Power Mode Register
REGISTER BIT
7
NAME
SLPEN
DESCRIPTION
Speaker Low-Power Mode. Only functions if EXPSEN ≠ 0.
0 = Class D output is active continuously.
1 = Class D output is active if the speaker volume setting selected by the expander is
above SLPTH.
0x0F
Speaker Low-Power Mode Volume Threshold. Threshold used to determine if speaker
5
amplifier should be enabled or disabled. If the volume selected by the expander is less
than this threshold, the speaker amplifier is disabled.
4
VALUE
GAIN
(dB)
VALUE
GAIN
(dB)
VALUE
GAIN
(dB)
VALUE
GAIN
(dB)
0x00
-63
0x10
-47
0x20
-31
0x30
-15
0x01
-62
0x11
-46
0x21
-30
0x31
-14
3
0x02
-61
0x12
-45
0x22
-29
0x32
-13
0x03
-60
0x13
-44
0x23
-28
0x33
-12
0x04
-59
0x14
-43
0x24
-27
0x34
-11
SLPTH
0x05
-58
0x15
-42
0x25
-26
0x35
-10
2
0x06
-57
0x16
-41
0x26
-25
0x36
-9
0x07
-56
0x17
-40
0x27
-24
0x37
-8
0x08
-55
0x18
-39
0x28
-23
0x38
-7
0x09
-54
0x19
-38
0x29
-22
0x39
-6
1
0x0A
-53
0x1A
-37
0x2A
-21
0x3A
-5
0x0B
-52
0x1B
-36
0x2B
-20
0x3B
-4
0x0C
-51
0x1C
-35
0x2C
-19
0x3C
-3
0x0D
-50
0x1D
-34
0x2D
-18
0x3D
-2
0
0x0E
-49
0x1E
-33
0x2E
-17
0x3E
-1
0x0F
-48
0x1F
-32
0x2F
-16
0x3F
0
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