![TQ-Systems MBa335x Скачать руководство пользователя страница 40](http://html1.mh-extra.com/html/tq-systems/mba335x/mba335x_user-manual_1146561040.webp)
User's Manual l MBa335x UM 0202 l © 2018, TQ-Systems GmbH
Page 33
4.2.9
Audio
TQMa335x
MCASP0.AXR1
MCASP0_AXR0
MCASP0.ACLKR
MCASP0.FSX
I2C0.SDA
I2C0.SCL
TLV320AIC
DOUT
IN1R/IN1L
DIN
GPIO
WCLK
BCLK
SCL
SDA
3.5 mm jack
(X19)
LOR/LOL
HPR/HPL
IN3L
3.5 mm jack
(X20)
3.5 mm jack
(X21)
MCASP0.ACLKX
MCASP0_FSR
SCLK
Microphone
Line-In
Line-Out / HP
Illustration 29:
Block diagram audio
Audio input and output is available using the audio codec TLV320AIC. The codec is connected via the MCASP0 interface of the
AM335x. The MBa335x provides a stereo line-in, a stereo line-out and a microphone input as well as a headphone output with
integrated amplifier.
An assembly option selects between line-out and headphone. The following table shows the possible configuration.
Table 54:
Configuration line-out / headphone, X21
Mode
R2207
R2209
R2210
R2211
Remark
Headphone
NP
NP
0 Ω
0 Ω
–
Line-out
0 Ω
0 Ω
NP
NP
Default
The following tables show the characteristics of the audio codec.
Table 55:
Characteristics of audio and headphone, X21
Parameter
Min.
Typ.
Max.
Unit
Remark
Load resistor
14.4
16
–
Ω
Single-ended configuration
Load resistor
24.4
32
–
Ω
Differential configuration
Output power
–
64
–
mW
At 16 Ω input impedance and –40 dB THD
Output power
–
40
–
mW
At 32 Ω input impedance and –40 dB THD
Signal-noise ratio
87
100
–
dB
Table 56:
Characteristics of line-out, X21
Parameter
Min.
Typ.
Max.
Unit
Load resistor
0.6
106
–
kΩ
Signal-noise ratio
87
100
–
dB
Table 57:
Characteristics of line-in, X20
Parameter
Min.
Typ.
Max.
Unit
Signal-noise ratio
80
93
–
dB
Table 58:
Characteristics of microphone, X19
Parameter
Min.
Typ.
Max.
Unit
Output Noise
–
10
–
µV
RMS
Current
–
3
–
mA