Rainbow Electronics MAX98089 - Manual (Page 106)

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MAX98089
Low-Power, Stereo Audio Codec
with FlexSound Technology
Table 25. Power Limiter Registers (continued)
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.
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