Datasheet

Maxim Integrated │ 100
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Table 27. DSP Filter Configuration Register
Figure 14. Record Path FlexSound Technology DSP Block
ADDRESS: 0x26
DESCRIPTION
BIT NAME TYPE POR
7 MODE R/W 1
Enables the Codec DSP FIR Music Filters (Default IIR Voice Filters)
0: The codec DSP lters operate in IIR voice mode with stop band frequencies below
the f
S
/2 Nyquist rate. The voice mode lters are optimized for 8kHz or 16kHz voice
application use.
1: The codec DSP lters operate in a linear phase FIR audio mode optimized to
maintain stereo imaging and operate at higher f
S
rates while utilizing lower power.
6 AHPF R/W 0
Enables the Record Path DC-Blocking Filter
0: DC-blocking lter disabled.
1: DC-blocking lter enabled.
5 DHPF R/W 0
Enables the Playback Path DC-Blocking Filter
0: DC-blocking lter disabled.
1: DC-blocking lter enabled.
4 DHF R/W 0
Enables the DAC High Sample Rate Mode (LRCLK > 48kHz, FIR Only)
0: LRCLK is less than 48kHz. 8x FIR interpolation lter used.
1: LRCLK is greater than 48kHz. 4x FIR interpolation lter used.
3 — — — —
2 — — — —
1 — — — —
0 — — — —
DIGITAL
MIC
LEFT
MUX
DIGMICL
LEFT
FILTERS
MODE
AHPF
DHF
LEFT
BIQUAD
FILTER
RECBQEN
AVBQ[3:0]
REC_B0[23:0]
REC_B1[23:0]
REC_B2[23:0]
REC_A1[23:0]
REC_A2[23:0]
LEFT
SIDETONE
DSTS[1:0]
DVST[3:0]
FLEXSOUND
TECHNOLOGY DSP
AVLG[2:0]
AVL[3:0]
AVRG[2:0]
AVR[3:0]
DIGITAL
MIC
RIGHT
MUX
RIGHT
FILTERS
DIGMICR
RIGHT RECORD PATH
SIDETONE TO
PLAYBACK PATH
LEFT RECORD PATH
RIGHT
BIQUAD
FILTER
RIGHT
SIDETONE
LEFT
LEVEL
L/R ST
LEVEL
RIGHT
LEVEL
DAI
ADC
LEFT
ADC
RIGHT
DMDL
DMDR
ADCR
ADCL
ADCHP
OSR128
ADCDITHER
MIXADL[6:0]
MIXADR[6:0]
IN1-IN2
DIGITAL MIC DATA
IN3-IN4
IN5-IN6
LINE A
LINE B
MIC 1
MIC 2
ADC
LEFT
MIXER
IN1-IN2
IN3-IN4
IN5-IN6
LINE A
LINE B
MIC 1
MIC 2
ADC
RIGHT
MIXER
ADLEN
ADREN