Datasheet
MAX9880A
Low-Power, High-Performance
Dual I
2
S Stereo Audio Codec
40 ______________________________________________________________________________________
CODE FILTER TYPE
VALID SAMPLE
RATE (kHz)
HIGHPASS CORNER FREQUENCY 217Hz NOTCH
0x0 Disabled
0x1 Elliptical 16 256Hz Yes
0x2 Butterworth 16 500Hz No
0x3 Elliptical 8 256Hz Yes
0x4 Butterworth 8 500Hz No
0x5 Butterworth 8 to 24 f
S
/240 No
0x6 to 0x7 Reserved
Table 10. IIR Highpass Digital Filters
Digital Filtering
The MAX9880A incorporates both IIR (voice) and FIR
(audio) digital filters to accomodate a wide range of
audio sources. The IIR fiilters provide over 70dB of
stopband attenuation as well as selectable highpass fil-
ters. The FIR filters provide low power consumption and
are linear phase to maintain stereo imaging.
REGISTER B7 B6 B5 B4 B3 B2 B1 B0
REGISTER
ADDRESS
(SEE NOTE)
DIGITAL FILTERING
Codec Filters MODE AVFLT DCB DVFLT 0x11
BITS FUNCTION
MODE
Digital Audio Filter Mode. Selects the filtering mode for the DAI1 DAC and ADC signal paths.
0 = IIR voice filters
1 = FIR audio filters
AVFLT
ADC Digital Audio Filter. Configures the highpass filters for the DAI1 signal path.
MODE = 0
Select the desired digital filter response from Table 10. See the frequency response graphs in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter disabled.
0x1 = DC-blocking filter enabled.
DCB
1 = DC-blocking filter for DAI2 enabled.
0 = DC-blocking filter for DAI2 disabled.
DVFLT
DAC Digital Audio Filter. Configures the highpass filters for the DAI1 signal path.
MODE = 0
Select the desired digital filter response from Table 10. See the frequency response graphs in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter disabled.
0x1 = DC-blocking filter enabled.
Table 9. Digital Filtering Register
Note: Register addresses listed are for I
2
C. To get the SPI address, add 0x200 with the following exception: Register 0xFF is not
accessible through SPI.