Datasheet

Maxim Integrated │ 97
MAX98090 Ultra-Low Power Stereo Audio Codec
www.maximintegrated.com
Audio Record Path
The device record path comprises several sequential
blocks. The first block is a stereo ADC with configurable
mixers that can accept input from the microphone PGAs,
line input PGAs, or directly differentially from any of the
analog input pairs. Internally, the digital record path has
two channels (left and right), which accept a digital signal
either from the appropriate digital microphone or ADC
output channel. The two channels then pass through sev-
eral DSP stages before being routed into the digital audio
interface (DAI, Figure 12).
Figure 12. Record Path Block Diagram
DIGITAL
MIC
LEFT
MUX
DIGMICL
ADC
LEFT
ADC
RIGHT
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
DMDL
DMDR
ADCR
ADCL
ADCHP
OSR128
ADCDITHER
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
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
DAI