MAX98090AETL+ Maxim Integrated, MAX98090AETL+ Datasheet - Page 94

• Manufacturer Part Number: MAX98090AETL+
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

Specifications of MAX98090AETL+

• Rohs: yes

MAX98090
Figure 13. Record Path ADC Section
Analog-to-Digital Converter (ADC)
The stereo ADC architecture includes two independent
audio paths and provides a flexible, fully configurable
input mixer, two performance and power based con-
figuration options, oversampling rate selection, and an
input dither option (Figure 13). Both ADC channels can
be enabled independently allowing the device to support
both stereo and left or right mono configurations (Table 7).
ADC Functional Configuration
The ADC can be configured into one of two operating
modes. One operating mode is optimized for maximum
dynamic performance while the other is optimized for
lower power consumption (Table 5). Input dither can also
be added to the ADC record path. This feature consumes
almost no appreciable power, but raises the RMS level of
the noise floor slightly at the high end of the audio band.
The ADC supports both an over sampling rate (OSR) of
64 and 128 times the configured sampling frequency (f
An OSR of 128 x f
cost of slightly more power consumption than an OSR of
64 x f
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DIGITAL MIC DATA
S
IN1-IN2
IN3-IN4
IN5-IN6
IN1-IN2
IN3-IN4
IN5-IN6
LINE A
LINE B
LINE A
LINE B
.
MIC 1
MIC 2
MIC 1
MIC 2
MIXER
MIXER
RIGHT
LEFT
ADC
ADC
S
ADREN
ADLEN
optimizes ADC performance at the
MIXADR[6:0]
MIXADL[6:0]
ADCDITHER
LEFT
RIGHT
ADC
OSR128
ADCHP
ADC
DMDR
DMDL
ADCR
ADCL
DIGMICR
DIGMICL
TECHNOLOGY DSP
DIGITAL
DIGITAL
RIGHT
MUX
MUX
LEFT
MIC
MIC
FLEXSOUND
S
).
FILTERS
FILTERS
MODE
RIGHT
AHPF
LEFT
DHF
The DSP timing, however, places some limitations on
which OSR can be used. For voice applications using
standard (f
rates, the DSP is typically configured to utilize the voice
filters (IIR). If the voice filters are enabled, the OSR is
automatically configured to 128 x f
ally reprogrammed in order to meet timing requirements.
In most standard music/full audio range applications
(where f
(FIR) are used. If the music filters are enabled, the OSR
can be configured manually, however, the prescaled mas-
ter clock (PCLK) must always be at least twice the fre-
quency of the ADC sampling clock. To ensure this condi-
tion is met, if f
to 64 x f
(DHF = 1, such as f
configured to 64 x f
music filter configuration, OSR = 128 can be selected as
desired for optimal ADC performance.
Ultra-Low Power Stereo Audio Codec
RIGHT RECORD PATH
LEFT RECORD PATH
S
S
REC_B0[23:0]
REC_B1[23:0]
REC_B2[23:0]
REC_A1[23:0]
REC_A2[23:0]
. In addition, if the sampling rate exceeds 50kHz
= 32kHz, 44.1kHz, 48kHz, etc.) the music filters
RECBQEN
AVBQ[3:0]
S
BIQUAD
BIQUAD
FILTER
FILTER
RIGHT
LEFT
= 8kHz) and wideband (f
PCLK
S
< 256 x f
PLAYBACK PATH
S
regardless of the ratio. In any other
SIDETONE
SIDETONE
SIDETONE TO
DSTS[1:0]
= 96kHz), then the OSR must be
RIGHT
LEFT
S
, then the OSR must be set
S
and cannot be manu-
S
Maxim Integrated │ 94
RIGHT
LEVEL
LEVEL
AVRG[2:0]
L/R ST
LEVEL
AVLG[2:0]
DVST[3:0]
LEFT
= 16kHz) sampling
AVR[3:0]
AVL[3:0]
DAI