Toradex Colibri - Unused Analog Audio Signal Termination

Colibri Carrier Board Design Guide
Toradex AG l Altsagenstrasse 5 l 6048 Horw l Switzerland l +41 41 500 48 00 l www.toradex.com l info@toradex.com
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Figure 23: Analog Audio Reference Schematic
Figure 24: Analog Audio Reference Schematic (using virtual and switched grounds)
2.14.3 Unused Analog Audio Signal Termination
The unused analog audio signals can be left unconnected. Please note, even if the analog audio
interface is not used at all, the analog 3.3V power pins of the module (pin 10 and 12) still need to
be powered. Alternatively, the analog power can be connected to the digital 3.3V power rail.
47uF
6.3V
+
C4
47uF
6.3V
+
C5
15pF
50V
C1
15pF
50V
C2
GND
GND
LINEIN_L
LINEIN_R
HEADPHONE_L
HEADPHONE_R
AUDIO[0..6]
AUDIO_AGND
147300 5-1
PIN_1 / MIC_IN
1
PIN_5 / LINEIN_L
5
PIN_7 / LINEIN_R_
7
PIN_13 / HEADPHONE_GND
13
PIN_15 / HEADPHONE_L
15
PIN_17 / HEADPHONE_R
17
PIN_3 / MIC_GND
3
Colibri -Audio
8 of 16
X1H
MIC_IN
MIC_GND
LINEIN_R
LINEIN_L
HEADPHONE_GND
HEADPHONE_L
HEADPHONE_R
PJ3X01RF0 4B-H
1
25
22
24
23
HEADP. OUT - Green
2 of 3
X26B
PJ3X01RF0 4B-H
1
35
32
34
33
LINE IN - Blue
3 of 3
X26C
PJ3X01RF0 4B-H
1
5
2
4
3
MIC IN - Pink
2 of 3
X26A
MIC_I N
R2
100R
47uF
6.3V
+
C10
AUDIO _AVCC
R1
2.2K
R3
2.2K
GND
MIC_G ND
HEADPHONE_GND
TP1
TP2
HEADPHONE_AC_L
HEADPHONE_AC_R
Place close to
Microphone Connector
Top Jack
Middle Jack
Bottom Jack
3.3V
2.2uF
6.3V
C8 9
GND
5V
2.2uF
6.3V
C8 8
AUD IO_AGND
2A
220R @100MHz
L24
GND
AUD IO_AVCC
Vin
1
GND
2
N/C
4
Vout
E
3
NC P511SN33T 1G
IC6
Audio VCC Circuit
GND
AUD IO
_
AVCC
147300 5-1
GND
39
GND
41
GND
83
GND
109
GND
147
GND
181
GND
197
GND
199
VCC_BATT
40
3V3
42
3V3
108
3V3
182
3V3
198
3V3
200
3V3
84
3V3
148
PIN_9 / VSS_AUDIO
9
PIN_11 / VSS_AUDIO
11
Colibri - Power Supply
1 of 16
VDD _ANALOG
10
VDD _ANALOG
12
X1A
AUD IO_AGND
3.3V
SHIELD
JA3333L -D11P-4F
S1
S2
S3
S4
SHIELD
X26D
SHIELD
SHIELD
SHIELD
15pF
50V
C11
15pF
50V
15pF
50V
C8
50V
15pF
C8
C6
15pF
50V
C7
15pF
50V
C9
5
AUDIO_AGND
AUDIO_AGND
15pF
50V
C6
15pF
50V
C7
AUD IO_AGND
15pF
50V
C1
15pF
50V
C2
GND
GND
LINEIN_L
LINEIN_R
HEADPHONE_L
HEADPHONE_R
AUDIO[0..6]
15pF
50V
C9
147300 5-1
PIN_1 / MIC_IN
1
PIN_5 / LINEIN_L
5
PIN_7 / LINEIN_R
7
PIN_13 / HEADPHONE_GND
13
PIN_15 / HEADPHONE_L
15
PIN_17 / HEADPHONE_R
17
PIN_3 / MIC_GND
3
Colibri -Audio
8 of 16
X1H
MIC_IN
MIC_GND
LINEIN_R
LINEIN_L
HEADPHONE_GND_
HEADPHONE_L
HEADPHONE_R
PJ3X01RF0 4B-H
1
25
22
24
23
HEADP. OUT - Green
2 of 3
X26B
PJ3X01RF0 4B-H
1
35
32
34
33
LINE IN - Blue
3 of 3
X26C
PJ3X01RF0 4B-H
1
5
2
4
3
MIC IN - Pink
2 of 3
X26A
MIC_IN
R2
100R
47uF
6.3V
+
C10
AUD IO_AVCC
R1 2.2K
R3 2.2K
GND
MIC_GND
HEADPHONE_GND
Place close to
Microphone Connector
Top Jack
Middle Jack
Bottom Jack
3.3V
2.2uF
6.3V
C8 9
GND
5V
2.2uF
6.3V
C88
AUD IO_AGND
2A
220R @100MHz
L24
GND
AUDIO_AVCC
Vin
1
GND
2
N/C
4
Vout
E
3
NC P511SN33T 1G
IC6
Audio VCC Circuit
GND
AUDIO_AVCC
147300 5-1
GND
39
GND
41
GND
83
GND
109
GND
147
GND
181
GND
197
GND
199
VCC _BATT
40
3V3
42
3V3
108
3V3
182
3V3
198
3V3
200
3V3
84
3V3
148
PIN_9 / VSS_AUDIO
9
PIN_11 / VSS_AUD IO
11
Colibri - Power Supply
1 of 16
VDD _ANALOG
10
VDD _ANALOG
12
X1A
AUDIO_AGND
3.3V
Virtual ground (voltag e offset)
Do not connect to normal ground!
Switched ground
SHIELD
JA3333L -D11P-4F
S1
S2
S3
S4
SHIELD
X26D
SHIELD
SHIELD
SHIELD
C11
C3
15pF
50V
15pF
50V
C8
15pF
50V
5