Rainbow Electronics MAX98088 - Manual (Page 102)

Stereo Audio Codec
with FLEXSOUND Technology
MAX98088
102
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.
Table 25. Power Limiter Registers (continued)
REGISTER BIT NAME DESCRIPTION
0x45
7
PWRT2
Power Limiter Time Constant 2
Select a value that matches the thermal time constant of the loudspeaker’s magnet.
6
VALUE
TIME CONSTANT
(min)
VALUE
TIME CONSTANT
(min)
0x0 Disabled 0x8 3.75
0x1 0.50 0x9 5.00
5
0x2 0.67 0xA 6.66
0x3 0.89 0xB 8.88
0x4 1.19 0xC Reserved
4
0x5 1.58 0xD Reserved
0x6 2.11 0xE Reserved
0x7 2.81 0xF Reserved
3
PWRT1
Power Limiter Time Constant 1
Select a value that matches the thermal time constant of the loudspeaker’s voice coil.
2
VALUE
TIME CONSTANT
(s)
VALUE
TIME CONSTANT
(s)
0x0 Disabled 0x8 3.75
0x1 0.50 0x9 5.00
1
0x2 0.67 0xA 6.66
0x3 0.89 0xB 8.88
0x4 1.19 0xC Reserved
0
0x5 1.58 0xD Reserved
0x6 2.11 0xE Reserved
0x7 2.81 0xF Reserved