Texas Instruments PCM2900C User manual

PCM2900C/2902C/2906CEVM-U
User's Guide
Literature Number: SBAU195
September 2011

2SBAU195–September 2011
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Contents
1 Description ......................................................................................................................... 5
1.1 Block Diagram ........................................................................................................... 6
1.2 Connectors and Jumpers ............................................................................................... 6
1.3 Switch Settings .......................................................................................................... 6
2 Schematic and PCB ............................................................................................................. 7
2.1 PCM290xCEVM-U PCB ................................................................................................ 7
3
SBAU195–September 2011 Table of Contents
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4Contents SBAU195–September 2011
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User's Guide
SBAU195–September 2011
PCM2900C/2902C/2906CEVM-U
1 Description
The PCM2900C/2902C/2906CEVM-U (PCM290xCEVM-U) is an evaluation board for Texas Instruments'
newly developed USB interface codecs, the PCM2900C,PCM2902C, and PCM2906C. The PCM2900C
includes a PCM2900C device, a bus-powered USB codec without an S/PDIF interface. The PCM2902C
includes a PCM2902C device, a bus-powered USB codec with an S/PDIF interface. The PCM2906C
includes a PCM2906C device, a bus-powered (500 mA) USB codec with an S/PDIF interface. Each
evaluation board also includes operational amplifiers for line input/output buffers, a 3.3-V regulator, and a
USB connector.
For information about the differences between the PCM290xCEVM-U and the DEM-PCM290xB-EVM
demonstration fixtures, see Application Report SBFA020.
The USB connector is mounted on the PCM2900C/2902C/2906C printed circuit board (PCB). Connecting
a USB interface to this USB connector enables the evaluation of codec performance.
The PCM2900C/2902C/2906C operates from the 5-V bus power supply of the USB. A 3.3-V IC regulator
is mounted on the board to provide power for analog circuitry and optionally for the codec.
Stereo audio output and input are available on two stereo mini-jacks.
The PCM2900C/2902B/2906B support the following USB features:
•Fully compliant with USB2.0 specification
•Full-speed transceivers
•Partially-programmable descriptors
•USB adaptive mode for playback
•USB asynchronous mode for record
•Bus-powered
•Full-speed transceivers
5
SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U
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S/PDIF IN
S/PDIF OUT
USB
Connector
USB Interface
SW001 - SW003
Operation Control
3.3 V
REG
12-MHz XTAL
CN002
CN001
Lch
Rch
V L/R
OUT
V L/R
IN
DIN
DOUT
D+/–
VBUS
OPA2353
LPF
OPA2353
LPF
CN101
Analog Out
Lch
Rch
CN102
Analog In
PCM2900C
PCM2902C
PCM2906C
GND GND
OUT IN
Description www.ti.com
1.1 Block Diagram
A block diagram of the PCM2900C/2902C/2906C is shown in Figure 1.
Figure 1. PCM290xCEVM-U Block Diagram
1.2 Connectors and Jumpers
Table 1 summarizes the connectors and jumpers on the PCM290xCEVM-U. Figure 2 illustrates the pinout
for CN002.
Table 1. Connectors and Jumpers
Connector/Jumper Description
USB port (series B connector); connects to a USB
CN001 cable/connector
CN101 Audio LINE OUT (stereo mini-jack, 1.98 VPP full-scale)
CN102 Audio LINE IN (stereo mini-jack, 1.98 VPP full-scale)
CN002 S/PDIF IN/OUT for PCM2902C/PCM2906C
Figure 2. CN002 Pinout
1.3 Switch Settings
•SW001: Human interface device (HID) key state (mute)
•SW002: HID key state (volume up)
•SW003: HID key state (volume down)
These switches should be set to logic level low when no HID is being used, or toggled high for HID control
of the respective parameters.
6PCM2900C/2902C/2906CEVM-U SBAU195–September 2011
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www.ti.com Schematic and PCB
2 Schematic and PCB
This section presents the PCM290xCEVM-U PCB layout. A full-size schematic of the evaluation fixture is
appended to this user guide.
2.1 PCM290xCEVM-U PCB
Figure 3. PCM2900CEVM/2902CEVM/2906CEVM-U Silkscreen
7
SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U
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Schematic and PCB www.ti.com
Figure 4. PCM2900CEVM/2902CEVM/2906CEVM-U Top View
8PCM2900C/2902C/2906CEVM-U SBAU195–September 2011
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www.ti.com Schematic and PCB
Figure 5. PCM2900CEVM/2902CEVM/2906CEVM-U Bottom View
9
SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U
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