Datasheet
28
27
26
25
24
23
22
21
20
19
1
2
3
4
5
6
7
8
9
10
SCL
11
12
13
14
18
17
16
15
R
9
C
4
GND
R
1
C
2
X
1
C
1
SDA
S/PDIF OUT
C
7
R
2
C
3
R
3
R
4
C
6
C
5
+
C
8
+
C
9
+
C
10
C
11
R
5
C
12
R
6
R
7
R
8
C
13
+
C
14
+
PCM2704CDB
External ROM
(Optional)
(3)
USB ‘B’
Connector
D-
D+
V
BUS
SUSPEND
TPA200x
Power Amp
MUTE
VOLUME+
VOLUME-
XTO
XTI
CK
DT
PSEL
(2)
DOUT
DGND
V
DD
D-
D+
V
BUS
V
CCP
(3)
ZGND
PGND
AGNDL AGNDR
V
CCL
V
CCR
V L
OUT
(1)
V R
OUT
(1)
V
COM
HOST
(2)
HID0/MS
HID1/MC
HID2/MD
TEST1
TEST0
SSPND
PCM2704C, PCM2705C
PCM2706C, PCM2707C
SBFS036A –AUGUST 2011–REVISED JULY 2012
www.ti.com
EXAMPLE CIRCUITS
Operating Environment
For current information on the PCM2704C/2705C/2706C/2707C operating environments, see the Updated
Operating Environments for PCM270X, PCM290X Applications application report, SLAA374, available through
the TI website at www.ti.com.
Typical Circuit Connection 1: USB Speaker
Figure 34 illustrates a typical circuit connection for an internal-descriptor, bus-powered, 500-mA application.
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
7
: 1-μF
ceramic capacitors. C
8
: 10-μF electrolytic capacitor. C
9
, C
10
: 100-μF electrolytic capacitors (depending on tradeoff between required
frequency response and discharge time for resume). C
11
, C
12
: 0.022-μF ceramic capacitors. C
13
, C
14
: 1-μF electrolytic capacitors. R
1
: 1-MΩ
resistor. R
2
, R
9
: 1.5-kΩ resistors. R
3
, R
4
: 22-Ω resistors. R
5
, R
6
: 16-Ω resistors. R
7
, R
8
: 330-Ω resistors (depending on tradeoff between
required THD performance and pop-noise level for suspend).
(1) Output impedance of V
OUT
L and V
OUT
R during suspended 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 34. Bus-Powered Application
NOTE
The circuit illustrated in Figure 34 is for information only. The entire board design should
be considered to meet the USB specification as a USB-compliant product.
30 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): PCM2704C PCM2705C PCM2706C PCM2707C