User’s Guide
August 2002 DAV Digital Audio/Speaker
SLEU024
IMPORTANT NOTICE
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Copyright 2002, Texas Instruments Incorporated
EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EV ALUA TION
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Copyright 2002, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 5 V and the output voltage
range of 5 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
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field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
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connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
55°C. The EVM is designed to operate properly with certain components above 55°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
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Copyright 2002, Texas Instruments Incorporated
Contents
Contents
1 Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Connection Setting 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Switch Settings 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Schematic and Printed-Circuit Board 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 DEM-PCM2900/2902 Printed-Circuit Board 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 DEM-PCM2900/2902 Schematic 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
1–1 DEM-PCM2900/2902 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 DEM-PCM2900/2902 Silkscreen 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 DEM-PCM2900/2902 Top View 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 DEM-DAI/DAC Bottom View 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 DEM-PCM2900/2902 Schematic 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
Contents
vi
Chapter 1
Description
The DEM-PCM2900 and DEM-PCM2902 are evaluation boards for the newly
developed Texas Instruments USB interface codecs, PCM2900 and
PCM2902. The DEM-PCM2900 includes a PCM2900. It is a bus-powered
USB codec without an S/PDIF interface. The DEM-PCM2902 includes a
PCM2902. It is a bus-powered USB codec with an S/PDIF interface.
A USB connector is mounted on DEM-PCM2900/2902. Connecting a USB
interface to this connector enables the evaluation of codec performance.
The DEM-PCM2900/2902 is operated by the 5-V bus power supply of the USB.
A 3.3-V IC regulator is mounted on the board to provide power or the codec and
analog circuitry.
Stereo audio output is available on a stereo minijack.
The PCM2900/2902 supports the following USB features:
- Fully compliant with the USB 1.1 specification
- Partially programmable descriptors
- USB adaptive mode for playback
- USB asynchronous mode for record
- Bus powered
- Full-speed transceivers
Topic Page
1.1 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Connection Setting 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Switch Settings 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
Block Diagram
1.1 Block Diagram
Figure 1–1.DEM-PCM2900/2902 Block Diagram
3.3 V
REG
CN002
DIN
DOUT
V
BUS
D+/–
PCM2900
PCM2902
USB Interface
S/PDIF IN
S/PDIF OUT
CN001
USB
Connector
V
OUT
L/R
VINL/R
12M XTAL
OPA2353
LPF
OPA2353
LPF
CN101
Analog Out
Lch
Rch
CN102
Analog In
Lch
Rch
1.2 Connection Setting
- CN001 : USB port (series B connector), connects to a USB cable/
- CN101 : Audio LINE OUT (stereo minijack, 1.98 V
- CN102 : Audio LINE IN (stereo minijack, 1.98 V
- CN002 : S/PDIF IN/OUT for DEM-PCM2902
1.3 Switch Settings
SW001 – SW003
Operation Control
connector
GND GND
OUT IN
SSPND
full scale)
PP
full scale)
PP
- SW001: HID key state (mute)
- SW002: HID key state (volume up)
- SW003: HID key state (volume down)
These switches should be set to LOW logic level for software control, or
toggled HIGH for manual control of their respective parameters.
1-2
Chapter 2
Schematic and Printed-Circuit Board
This chapter presents the DEM-PCM2900/2902 printed-circuit board and
schematic.
Topic Page
2.1 DEM-PCM2900/2902 Printed-Circuit Board 2-2. . . . . . . . . . . . . . . . . . . . . .
2.2 DEM-PCM2900/2902 Schematic 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic and Printed-Circuit Board
2-1
DEM-PCM2900/2902 Printed-Circuit Board
2.1 DEM-PCM2900/2902 Printed-Circuit Board
Figure 2–1.DEM-PCM2900/2902 Silkscreen
Figure 2–2.DEM-PCM2900/2902 Top View
2-2
Figure 2–3.DEM-PCM2900/2902 Bottom View
DEM-PCM2900/2902 Printed-Circuit Board
Schematic and Printed-Circuit Board
2-3
DEM-PCM2900/2902 Schematic
2-4
2.2 DEM-PCM2900/2902 Schematic
Figure 2–4.DEM-PCM2900/2902 Schematic
U002
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PCM2900/02
D+
D–
V
BUS
DGNDU
HID0
HID1
HID2
SEL0
SEL1
V
CCI
AGNDC
VINL
VINR
V
COM
SSPND
V
DDI
DGND
DOUT
DIN
V
CCI
AGNDX
XTI
XTO
V
CCI
AGNDP
V
CCI
V
OUT
L
V
OUT
R
SW003
FT1D-2M
SW001
FT1D-2M
SW002
FT1D-2M
RA001
1.5 kΩ x 3
C003
1.0 µF
C004
1.0 µF
(GND)
(D
P)
(D
M)
(V
BUS)
CN001
67068–0001
R003 22 Ω
R002 22 Ω
4
3
2
1
R001
1.5 kΩ
CN002
FFC-10BMEP1
C005
1.0 µF
R005 1 MΩ
C009
18 pF
C010
18 pF
X001
12 MHz
45
U001
REG103GA-A
C001
0.1 µF
+
–
+
C101
10 µF/16 V
R101
12 kΩ
C103
1800 pF
R103
3.9 kΩ
2
3
1
U101
OPA2353UA
1/2
R105
12 kΩ
C105
330 pF
4
R107
100 Ω
+
C107
10 µF/16 V
+
–
+
C102
10 µF/16 V
R102
12 kΩ
C104
1800 pF
R104
3.9 kΩ
6
5
7
U101
OPA2353UA
2/2
R106
12 kΩ
C106
330 pF
8
R108
100 Ω
+
–
C112
1800 pF
R113
3.9 kΩ
6
5
U102
OPA2353UA
1/2
R111
12 kΩ
C110
330 pF
R115
12 kΩ
+
C114
10 µF/16 V
C116
10 µF/16 V
+
C108
10 µF/16 V
R109
100 Ω
7
8
+
+
–
C113
1800 pF
R114
3.9 kΩ
2
3
U102
OPA2353UA
2/2
R112
12 kΩ
C111
330 pF
R116
12 kΩ
+
C115
10 µF/16 V
+
C109
10 µF/16 V
R110
100 Ω
1
4
NOTE: On the PCM2900, pin 24 and pin 25 are test pins.
R004
Jumper
2 (R1)
1 (S)
1
CN101
Stereo Mini-jack
YKB21–5274
Adj EN
3
GND
OUTIN
12
C002
1.0 µF
R007
12 kΩ
R006
22 kΩ
C006
1.0 µF
C007
1.0 µF
C008
1.0 µF
3 (T)
S/PDIF Out
S/PDIF In
SEL1
SEL0
REG-V
CC
2 (R1)
1 (S)
1
CN102
Stereo Mini-jack
YKB21–5274
3 (T)
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