ꢀꢁ ꢂꢃ ꢄ ꢅ ꢆ ꢇ ꢀ ꢁꢂ ꢃ ꢄꢅ ꢈ
ꢀꢁꢂ ꢃ ꢄ ꢅ ꢉ ꢇ ꢀ ꢁꢂ ꢃ ꢄꢅ ꢄ
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SLES081A − JUNE 2003 – REVISED MAY 2004
TYPICAL CIRCUIT CONNECTION 1 (EXAMPLE OF USB SPEAKER)
Figure 31 illustrates a typical circuit connection for an internal-descriptor, bus-powered, 500-mA application.
X
1
C
1
C
2
R
1
PCM2704DB
External ROM
(Optional)
XTO
CK
XTI
1
2
28
27
26
25
SUSPEND
SCL
SDA
SSPND
TEST0
TEST1
DT
3
R
9
PSEL
DOUT
DGND
4
S/PDIF OUT
5
HID2/MD 24
HID1/MC 23
HID0/MS 22
VOLUME–
VOLUME+
MUTE
6
USB ’B’
Connector
C
7
R
2
7
V
DD
R
R
3
D–
D+
D–
D+
HOST
8
21
20
C
4
4
V
CCP
9
V
10
V
PGND 19
BUS
BUS
C
3
C
8
+
GND
11 ZGND
V
COM
18
17
16
15
AGNDL
AGNDR
12
13
14
C
6
C
5
V
CCL
V
CCR
C
+
C
13
9
+
+
V
OUT
L
V R
OUT
+
C
11
C
12
C
10
C
14
TPA200X
Power
Amp
R
5
R
6
R
7
R
8
Notes:
X : 12-MHz crystal resonator
1
C , C : 10-pF to 33-pF (depending on load capacitance of crystal resonator)
1
2
C , C , C , C C : 1-µF ceramic
3
8
4
5
6,
7
C : 47-µF electrolytic
C , C : 100-µF electrolytic (depending on tradeoff between required frequency response and discharge time for resume)
9
10
C
C
, C : 0.022-µF ceramic
11 12
13 14
, C : 1-µF electrolytic
R : 1 MW
1
R , R : 1.5 kW
2
9
4
6
R , R : 22 W
3
R , R : 16 W
5
R , R : 330 W (depending on tradeoff between required THD performance and pop-noise level for suspend)
7
8
Output impedance of V
L and V
OUT
OUT
9
10
External ROM power can be supplied from V
Figure 31. Bus-Powered Application
Note that the circuit illustrated above is for information only. Whole-board design should be considered to meet the
USB specification as a USB-compliant product.
27
TI [ TEXAS INSTRUMENTS ]
