max98089 Maxim Integrated Products, Inc., max98089 Datasheet - Page 78
![no-image](/images/no-image-200.jpg)
max98089
Manufacturer Part Number
max98089
Description
Low-power, Stereo Audio Codec With Flexsound Technology
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX98089.pdf
(131 pages)
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Table 8. Sidetone Register
IC implements sidetone digitally. Doing so helps prevent
unwanted feedback into the playback signal path and
better matches the playback audio signal.
The IC includes two separate playback signal paths and
one record signal path. Digital audio interface 1 (DAI1)
is used to transmit the recorded stereo audio signal and
receive a stereo audio signal for playback. Digital audio
interface 2 (DAI2) is used to receive a second stereo
audio signal. Use DAI1 for all full-duplex operations and
for all voice signals. Use DAI2 for music and to mix two
playback audio signals. The digital audio interfaces are
separate from the audio ports to enable either interface
to communicate with any external device connected to
either audio port.
REGISTER
0x2E
BIT
7
6
4
3
2
1
0
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NAME
Digital Audio Interfaces
DSTS
DVST
Sidetone Source
Selects which ADC output is fed back as sidetone. When mixing the left and right ADC
outputs, each is attenuated by 6dB to prevent full-scale signals from clipping.
00 = Sidetone disabled
01 = Left ADC
10 = Right ADC
11 = Left + Right ADC
Sidetone Level
Adjusts the sidetone signal level. All levels are referenced to the ADC’s full-scale output.
Low-Power, Stereo Audio Codec
VALUE
0x0C
0x0D
0x0A
0x0B
0x0E
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0F
with FlexSound Technology
Sidetone disabled
Each audio interface can be configured in a variety of for-
mats including left justified, I
multiplexed (TDM). TDM mode supports up to 4 mono
audio slots in each frame. The IC can use up to 2 mono
slots per interface, leaving the remaining two slots avail-
able for another device. Table 9 shows how to configure
the device for common digital audio formats. Figures 16
and 17 show examples of common audio formats. By
default, SDOUTS1 and SDOUTS2 are set high imped-
ance when the IC is not outputting data to facilitate shar-
ing the bus. Configure the interface in TDM mode using
only slot 1 to transmit and receive mono PCM voice data.
The IC’s digital audio interfaces support both ADC to DAC
loop-through and digital loopback. Loop-through allows
the signal converted by the ADC to be routed to the DAC
for playback. The signal is routed from the record path to
LEVEL (dB)
-10.5
-12.5
-14.5
-16.5
-18.5
-20.5
-22.5
-24.5
-26.5
-28.5
-0.5
-2.5
-4.5
-6.5
-8.5
DESCRIPTION
VALUE
0x1C
0x1D
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1E
0x1F
2
S, PCM, and time division
MAX98089
LEVEL (dB)
-30.5
-32.5
-34.5
-36.5
-38.5
-40.5
-42.5
-44.5
-46.5
-48.5
-50.5
-52.5
-54.5
-56.6
-58.5
-60.5
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