Datasheet

Maxim Integrated │ 129
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Table 57. DSP Filter Configuration Register
Figure 31. Playback Path Digital-to-Analog Converter
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 > 50kHz, FIR Only)
0: LRCLK is less than 50kHz. 8x FIR interpolation lter used.
1: LRCLK is greater than 50kHz. 4x FIR interpolation lter used.
3 — — — —
2 — — — —
1 — — — —
0 — — — —
DVG[1:0]
FLEXSOUND
TECHNOLOGY DSP
DAI
SIDETONE FROM
RECORD PATH
RIGHT PLAYBACK PATH
TO THE
ANALOG
OUTPUT
MIXERS
LEFT PLAYBACK PATH
LEFT
SIDETONE
DSTS[1:0]
RIGHT
SIDETONE
LEFT 7-BAND
PARAMETRIC
EQUALIZER
RIGHT 7-BAND
PARAMETRIC
EQUALIZER
LEFT ALC:
AUTOMATIC
LEVEL CONTROL
B0_EQ_[23:0]
B1_EQ_[23:0]
B2_EQ_[23:0]
A1_EQ_[23:0]
A2_EQ_[23:0]
EQ_BANDEN
DVEQ[3:0]
EQCLP
LEFT
FILTERS
MODE
DHPF
RIGHT ALC:
AUTOMATIC
LEVEL CONTROL
RIGHT
FILTERS
DAC
LEFT
DAC
RIGHT
DAREN
DALEN
DVST[3:0]
DACHP
PERFMODE
DVM
DV[3:0]
LEFT
LEVEL
RIGHT
LEVEL
LEFT
GAIN
L/R ST
LEVEL
RIGHT
GAIN
ALCEN
ALCG[4:0]
ALCRLS[2:0]
ALCATK[2:0]
ALCCMP[2:0]
ALCTHC[4:0]
ALCEXP[2:0]
ALCTHE[4:0]