max9867 Maxim Integrated Products, Inc., max9867 Datasheet - Page 34

• Manufacturer Part Number: max9867
• Description: Low-power, Stereo Audio Codec
• Manufacturer: Maxim Integrated Products, Inc.

Ultra-Low Power Stereo Audio Codec
The MAX9867 incorporates both IIR (voice) and FIR
(audio) digital filters to accomodate a wide range of
audio sources. The IIR fiilters provide over 70dB of
Table 7. Digital Filtering Register
Table 8. IIR Highpass Digital Filters
34
Codec Filters
______________________________________________________________________________________
REGISTER
0x6 to 0x7
CODE
DVFLT
MODE
AVFLT
BITS
0x0
0x1
0x2
0x3
0x4
0x5
Digital Audio Filter Mode
0 = IIR Voice Filters
1 = FIR Audio Filters
ADC Digital Audio Filter
MODE = 0
Select the desired digital filter response from Table 8. See the Frequency Response graph in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter is disabled. Any other setting = DC-blocking filter is enabled.
DAC Digital Audio Filter
MODE = 0
Select the desired digital filter response from Table 8. See the Frequency Response graph in the Typical
Operating Characteristics section for details on each filter.
MODE = 1
0x0 = DC-blocking filter is disabled. Any other setting = DC-blocking filter is enabled.
MODE
B7
FILTER TYPE
Butterworth
Butterworth
Butterworth
Elliptical
Elliptical
Digital Filtering
B6
AVFLT
B5
INTENDED SAMPLE
RATE (kHz)
8 to 24
16
16
8
8
B4
stopband attenuation as well as selectable highpass fil-
ters. The FIR filters provide low-power consumption and
are linear phase to maintain stereo imaging. Table 7 is
the digital filtering register.
FUNCTION
Reserved
Disabled
B3
0
HIGHPASS CORNER
FREQUENCY (Hz)
B2
f
S
256
500
256
500
/240
DVFLT
B1
B0
217Hz NOTCH
Yes
Yes
No
No
No
REGISTER
ADDRESS
0x0A