Rainbow Electronics MAX9860 - Manual (Page 25)

Digital Filtering
The MAX9860 incorporates selecable highpass and
notch filters for both the playback and record paths.
Each filter is valid for a specific sample rate.
MAX9860
16-Bit Mono Audio Voice Codec
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Table 6. Digital Filter Registers
REGISTER ADDRESS B7 B6 B5 B4 B3 B2 B1 B0
0x08 AVFLT DVFLT
BITS FUNCTION
AVFLT ADC Voice Filter Frequency Select. See Table 7.
DVFLT DAC Voice Filter Frequency Select. See Table 7.
Table 7. Digital Filters
CODE FILTER TYPE SAMPLE RATE DESCRIPTION
0x0 — — Disabled
0x1 Elliptical 16kHz Elliptical highpass with 217Hz notch
0x2 Butterworth 16kHz 500Hz Butterworth highpass
0x3 Elliptical 8kHz Elliptical highpass with 217Hz notch
0x4 Butterworth 8kHz 500Hz Butterworth highpass
0x5 Butterworth 48kHz 200Hz Butterworth highpass
0x6 to 0xF — — Reserved