User Manual

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MAX98089
Low-Power, Stereo Audio Codec
with FlexSound Technology
Table 24. Excursion Limiter Registers
REGISTER BIT NAME DESCRIPTION
0x41
6
DHPUCF
Excursion Limiter Corner Frequency
The excursion limiter has limited sliding range and minimum corner frequencies. Listed
below are all the valid filter combinations.
5
LOWER CORNER
FREQUENCY
UPPER CORNER
FREQUENCY
MINIMUM BIQUAD COR-
NER FREQUENCY
DHPUCF DHPLCF
Excursion limiter disabled — 000 00
4
400Hz — 001 00
600Hz — 010 00
800Hz — 011 00
1kHz — 100 00
1
DHPLCF
Programmable using biquad 100Hz 000 11
200Hz 400Hz — 001 01
400Hz 600Hz — 010 10
400Hz 800Hz — 011 10
0
Programmable us-
ing biquad
400Hz 200Hz 001 11
Programmable us-
ing biquad
600Hz 300Hz 010 11
Programmable us-
ing biquad
800Hz 400Hz 011 11
Programmable us-
ing biquad
1kHz 500Hz 100 11
0x43
6
ALCRLS
ALC and Excursion Limiter Release Time
Sets the release time for both the ALC and Excursion Limiter. See the Automatic Level
Control section for ALC release times. Excursion limiter release time is defined as the
time required to slide from the high corner frequency to the low corner frequency.
VALUE EXCURSION LIMITER RELEASE TIME (s)
5
000 4
001 2
010 1
011 0.5
4
100 0.25
101 0.25
110 Reserved
111 Reserved
0x42
3
DHPTH
Excursion Limiter Threshold
Measured at the Class D speaker amplifier outputs. Signals above the threshold use the
upper corner frequency. Signals below the threshold use the lower corner frequency.
V
BAT
must correctly reflect the voltage of SPKLVDD to achieve accurate thresh-
olds.
000 = 0.34V
P
001 = 0.71V
P
010 = 1.30V
P
011 = 1.77V
P
100 = 2.33V
P
101 = 3.25V
P
110 = 4.25V
P
111 = 4.95V
P
2
1
0