Requirements
2-20
AT91CAP9-STK Starter Kit User Guide
6351B–CAP–27-Jun-08
2.4.1.7
F7: Audio DAC
The AT73C213 DAC is used for the I²S audio output. It's controlled by the AT91CAP9 SPI0 bus, with
SPI0_NPCS2 chip select. I²S DAC dedicated serial interface is managed by AT91CAP9 SCC0 bus.
The implementation is shown below:
2.4.1.8
F8:Analog Input Adaptation
Analog input adaptation is realized by an AD8040 low-power high-speed rail-to-rail IO amplifier.
ADC[1..4] output signals of the amplifier drive the AD[0..7] ADC embedded in the AT91CAP9.
The implementation is shown below
J39
U12
AT73C213
PAINN
15
VBAT
12
CBP
14
HPP
13
LPHN
10
HPN
11
PAINP
16
MONOP
30
MONON
29
LINEL
6
LINER
7
AUXP
31
AUXN
32
HSL
3
HSR
4
INGND
8
GNDB
33
GNDD
23
SDIN
17
BCLK
18
LRFS
19
MCLK
20
RSTB
21
SMODE
22
VREF
1
VCM
9
AVDDHS
5
AVDD
2
VDIG
24
SPI_CSB
28
SPI_CLK
27
SPI_DIN
26
SPI_DOUT
25
J40
CONN_PHONEJACK_STEREO_CMS
2
1
4
3
5
R110
1K
R111
1K
C159
10uF_1210
1
2
C160
10uF_1210
1
2
C156
100nF
1
2
C158
100nF
1
2
R108
0R
L13
4,7
µ
H 220mA
1
2
R109
0R
VCC_DAC
C163
330pF
NC
1
2
C164
330pF
NC
1
2
VCC_DAC
+
C161
100uF
1
2
C157
100nF
1
2
3V3
+
C162
100uF
1
2
RESET#
AUDIO_CS#
SPCK
MOSI
MISO
HEADPHONE
LINE-OUT
C154
10uF_1210
1
2
C155
10uF_1210
1
2
R107
100K
For EMI protection
3V3
MCLK
SDIN
LRFS
BCLK
Table 2-18.
Analog Signal
Name
J52 jumper
Position
J53 jumper
Position
J54 jumper
Position
J55 jumper
Position
AT91CAP9
ADC Name
ADC1
1-2 (default)
-
-
-
AD4
ADC1
2-3
-
-
-
AD0
ADC2
-
1-2 (default)
-
-
AD5
ADC2
-
2-3
-
-
AD1
ADC3
-
-
1-2 (default)
-
AD6
ADC3
-
-
2-3
-
AD2
ADC4
-
-
-
1-2 (default)
AD7
ADC4
-
-
-
2-3
AD3