Datasheet

1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
V
COM
32
FSEL
9
AGNDR
31
TEST
10
V
CCR
30
SSPND
11
V R
OUT
(1)
29
XTI
12
V L
OUT
(1)
28
XTO
13
V
CCL
27
CK
14
AGNDL
26
DT
15
ZGND+
25
PSEL
(2)
16
PGND
V
CCP
(3)
HOST
(2)
FUNC3
FUNC0
HID0/MS
HID1/MC
HID2/MD
V
BUS
D+
D-
V
DD
DGND
FUNC1
FUNC2
DOUT
PCM2706CPJT
+
VOLUME-
VOLUME+
MUTE
NEXT TRACK
PLAY/PAUSE
C
5
C
3
C
4
C
6
SUSPEND
R
1
R
4
R
3
R
2
R
11
C
2
C
8
C
7
X
1
C
1
SCL
SDA
External ROM
(Optional)
(3)
STOP
PREVIOUS TRACK
GND
USB ‘B’
Connector
D-
D+
V
BUS
+
C
9
+
C
10
R
9
R
10
R
5
C
12
C
11
R
6
R
7
R
8
Headphone
PCM2704C, PCM2705C
PCM2706C, PCM2707C
www.ti.com SBFS036A –AUGUST 2011–REVISED JULY 2012
Typical Circuit Connection 2: Remote Headphone
Figure 35 illustrates a typical circuit connection for a bus-powered, 100-mA headphone with seven HIDs.
NOTE: X
1
: 12-MHz crystal resonator. C
1
, C
2
: 10-pF to 33-pF capacitors (depending on load capacitance of crystal resonator). C
3
to C
5
, C
7
,
C
8
: 1-μF ceramic capacitors. C
6
: 10-μF electrolytic capacitor. C
9
, C
10
: 100-μF electrolytic capacitors (depending on required frequency
response). C
11
, C
12
: 0.022-μF ceramic capacitors. R
1
: 1-MΩ resistor. R
2
, R
11
: 1.5-kΩ resistors. R
3
, R
4
: 22-Ω resistors. R
5
, R
6
: 16-Ω resistors.
R
7
to R
10
: 3.3-kΩ resistors.
(1) Output impedance of V
OUT
L and V
OUT
R during suspend mode or lack of power supply is 26 kΩ ±20%, which is the discharge path for C
9
and C
10
.
(2) Descriptor programming through external ROM is only available when PSEL and HOST are high.
(3) External ROM power can be supplied from V
CCP
, but any other active component must not use V
CCP
, V
CCL
, V
CCR
, or V
DD
as a power
source.
Figure 35. Bus-Powered Application
NOTE
The circuit illustrated in Figure 35 is for information only. The entire board design should
be considered to meet the USB specification as a USB-compliant product.
Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 31
Product Folder Link(s): PCM2704C PCM2705C PCM2706C PCM2707C