MAX9888 Datasheet, PDF (94/115 Pages) Maxim Integrated Products – Stereo Audio CODEC with FLEXSOUND Technology

Stereo Audio CODEC
with FLEXSOUND Technology
Table 26. Power Limiter Registers (continued)
7
6
5
4
0x43
3
2
1
0
PWRT2
PWRT1
Power Limiter Time Constant 2
Select a value that matches the thermal time constant of the loudspeaker’s magnet.
VALUE
TIME CONSTANT
(min)
VALUE
TIME CONSTANT
(min)
0x0
Disabled
0x8
3.75
0x1
0.50
0x9
5.00
0x2
0.67
0xA
6.66
0x3
0.89
0xB
8.88
0x4
1.19
0xC
Reserved
0x5
1.58
0xD
Reserved
0x6
2.11
0xE
Reserved
0x7
2.81
0xF
Reserved
Power Limiter Time Constant 1
Select a value that matches the thermal time constant of the loudspeaker’s voice coil.
VALUE
TIME CONSTANT
(s)
VALUE
TIME CONSTANT
(s)
0x0
Disabled
0x8
3.75
0x1
0.50
0x9
5.00
0x2
0.67
0xA
6.66
0x3
0.89
0xB
8.88
0x4
1.19
0xC
Reserved
0x5
1.58
0xD
Reserved
0x6
2.11
0xE
Reserved
0x7
2.81
0xF
Reserved
Distortion Limiter
The IC’s distortion limiter ensures that the speaker amplifier’s output does not exceed the programmed THD+N limit.
The distortion limiter analyzes the Class D output duty cycle to determine the percentage of the waveform that is
clipped. If the distortion exceeds the programmed threshold, the output gain is reduced.
94