Texas Instruments PCM2900C Manual de usuario

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

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

SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U

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

DIN

DOUT

D+/–

VBUS

OPA2353

LPF

OPA2353

LPF

CN101

Analog Out

Lch

Rch

CN102

Analog In

PCM2900C

PCM2902C

PCM2906C

GND GND

OUT IN

Description

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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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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

SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U

Schematic and PCB

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Figure 4. PCM2900CEVM/2902CEVM/2906CEVM-U Top View

8PCM2900C/2902C/2906CEVM-U SBAU195–September 2011

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Schematic and PCB

Figure 5. PCM2900CEVM/2902CEVM/2906CEVM-U Bottom View

SBAU195–September 2011 PCM2900C/2902C/2906CEVM-U

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