max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 93

• Manufacturer Part Number: max98089
• Description: Low-power, Stereo Audio Codec With Flexsound Technology
• Manufacturer: Maxim Integrated Products, Inc.

Table 16. Automatic Level Control Registers
The parametric EQ contains five independent biquad
filters with programmable gain, center frequency, and
bandwidth. Each biquad filter has a gain range of Q12dB
and a center frequency range from 20Hz to 20kHz. Use a
filter Q less than that shown in Figure 22 to achieve ideal
frequency responses. Setting a higher Q results in non-
ideal frequency response. The biquad filters are series
connected, allowing a total gain of Q60dB.
REGISTER
0x43
BIT
7
6
5
4
3
2
1
0
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ALCRLS
ALCMB
ALCEN
ALCTH
NAME
Parametric Equalizer
ALC Enable
Enables ALC on both the DAI1 and DAI2 playback paths.
0 = Disabled
1 = Enabled
ALC and Excursion Limiter Release Time
Sets the release time for both the ALC and Excursion Limiter. See the Excursion Limiter
section for Excursion Limiter release times. ALC release time is defined as the time
required to adjust the gain from 12dB to 0dB.
Multiband Enable
Enables dual-band processing with a 5kHz center frequency. SR1 and SR2 must be
configured properly to achieve the correct center frequency for each playback path.
0 = Single-band ALC
1 = Dual-band ALC
Low Signal Threshold
Selects the minimum signal level to be boosted by the ALC.
000 = -JdB (low-signal threshold disabled)
001 = -12dB
010 = -18dB
011 = -24dB
100 = -30dB
101 = -36dB
110 = -42dB
111 = -48dB
Low-Power, Stereo Audio Codec
with FlexSound Technology
VALUE
000
001
010
011
100
101
110
111
Figure 22. Maximum Recommended Filter Q vs. Frequency
DESCRIPTION
1000
100
0.1
10
1
100
f
s
= 8kHz
CENTER FREQUENCY (Hz)
1000
ALC RELEASE TIME (s)
f
s
= 96kHz
MAX98089
Reserved
Reserved
10,000
f
s
= 48kHz
0.25
0.5
8
4
2
1
100,000