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User's Guide

SLEU114–May 2011

PCM270xEVM-U

This user's guide contains information on the setup, operation, and construction of the PCM270xEVM-U,

an evaluation module (EVM) for digital-to-analog converters (DACs) PCM2704 and PCM2705.

Contents

1 Description ................................................................................................................... 1

1.1 Related Documentation From Texas Instruments ............................................................. 1

1.2 Block Diagram ...................................................................................................... 2

1.3 Basic Operating Connections .................................................................................... 2

2 Schematic, BOM, and Printed-Circuit Board ............................................................................ 4

2.1 PCM270xEVM-U Schematic ...................................................................................... 4

2.2 PCM270xEVM-U Parts List (BOM) .............................................................................. 5

2.3 PCM270xEVM-U Printed-Circuit Board ......................................................................... 6

List of Figures

1 PCM270xEVM-U Block Diagram.......................................................................................... 2

2 PCM270xEVM-U Circuit Diagram ........................................................................................ 4

3 PCM270xEVM-U Silkscreen............................................................................................... 6

4 PCM270xEVM-U—Top View .............................................................................................. 6

5 PCM270xEVM-U—Bottom View .......................................................................................... 7

List of Tables

1 Bill of Materials .............................................................................................................. 5

1 Description

The PCM270xEVM-U is an evaluation board for the USB interface DACs PCM2704 (DEM-PCM2704) and

PCM2705 (DEM-PCM2705).

A USB connector is mounted on the PCM270xEVM-U. This connector allows a customer to evaluate DAC

performance by connecting a USB interface to it.

By the use of jumper settings on the board, the PCM270xEVM-U can be operated either from USB bus

power or from an external 5-V power supply.

The PCM270xEVM-U outputs a stereo audio signal for headphones at stereo minijack CN2 (PD = 12 mW

at R

= 32 Ω), and an S/PDIF digital interface output at optical Toslink™ connector U4.

The PCM270xEVM-U is fully compliant with the USB 1.1 specification with full-speed transceiver format.

1.1 Related Documentation From Texas Instruments

PCM2704, PCM2705, PCM2706, PCM2707 Stereo Audio DAC With USB Interface, Single-Ended

Headphone Output and S/PDIF Output data sheet (SLES081)

Toslink is a trademark of Kabushiki Kaisha Toshiba DBA Toshiba Corporation.

All other trademarks are the property of their respective owners.

SLEU114– May 2011 PCM270xEVM-U

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Summary of content (9 pages)

PAGE 1
User's Guide SLEU114 – May 2011 PCM270xEVM-U This user's guide contains information on the setup, operation, and construction of the PCM270xEVM-U, an evaluation module (EVM) for digital-to-analog converters (DACs) PCM2704 and PCM2705. 1 2 Contents Description ................................................................................................................... 1.1 Related Documentation From Texas Instruments ............................................................. 1.2 Block Diagram ..
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Description 1.2 www.ti.com Block Diagram SW1–SW3 CN1 SPI(PCM2705) HID CN4 U3 CN2 EXT ROM USB bus interface 12-MHz XTAL Stereo minijack headphone output PCM2704 PCM2705 U4 U5 BUS/SELF power control S/PDIF output TOTX141P TM2 JP1–JP11 TM1 3.3-V reg CN3 GND +5 V B0295-01 Figure 1. PCM270xEVM-U Block Diagram 1.3 1.3.1 Basic Operating Connections Universal Serial Bus (USB) A USB interface is connected to USB connector CN4. 1.3.
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Description www.ti.com Self-Powered (default setting) JP1: Shorting plug of jumper JP1 must be removed. JP2–JP8: Shorting plugs of jumpers JP2–JP8 must be connected. JP9, JP10, JP11: Shorting plugs of jumpers JP9, JP10, and JP11 must be connected on the SELF side. CN3 or TM1, TM2 external power supply: External power supply must be connected either to CN3 or to TM1 and TM2. (VCC = 4.5 V to 10 V. ICC = 30 mA typical, 70 mA maximum.) A 3.3-V regulator IC is mounted to provide a 3.
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GND 1uF GND C12 GND Vdd 6 1 2 SHIELD GND VCC U4 INPUT 0.01uF C13 3 GND AT24C64N-10SI-2.7TR 5 3 4 8 7 U3 1 2 0.01uF C11 JP10 PCM270xEVM-U Copyright © 2011, Texas Instruments Incorporated Vdd 3 10Mohms R18 2 GND GND 1uF GND 1 JP11 1.5Kohms R2 27ohms SHIELD SIGNAL 2 1 3 1 2 3 1.5Kohms 1 1 10ohms 1uF GND 1Mohms R15 GND C1 10uF 1 2 23 6 1 VIN VOUT GND 15 14 3 16 13 10uF 0.1uF 15pF C2 1.5Kohms 0.
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Schematic, BOM, and Printed-Circuit Board www.ti.com 2.2 PCM270xEVM-U Parts List (BOM) Table 1. Bill of Materials Item QTY MFG MFG Part# REF DES Description Value or Function REF – PCM2704/2705 EVMA – ASSEMBLY – REF – PCM2704/2705 EVMA – SCHEMATIC – One Source Group PCM2704/2705 EVMA – FABRICATION – – ARTWORK – 1 PCM2704/2705 EVMA – 1 4 2031 SO1, SO2, SO3, SO4 STANDOFF,4-40,1.0INx3/16IN,ALUM RND F-F 2 3 26630301RP2 JP9, JP10, JP11 HEADER 3 PIN, PCB 2.
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Schematic, BOM, and Printed-Circuit Board 2.3 www.ti.com PCM270xEVM-U Printed-Circuit Board SO3 R7 SW1 R6 SW2 R5 CN1 SW3 SO2 TM2 CN3 TM1 C16 + U2 X1 C7 C14 CN2 R1 U1 C15 C9 R8 JP7 + C1 R9 C10 U3 JP4 R16 C6 C3 C2 R10 R11 C18 R19 + R20 R18 TPGND JP1 U4 JP2 R15 JP8 C5 + R3 C4 C8 R2 R13 R12 C11 C12 CN4 JP5 R14 L1 SO1 JP6 R21 + C13 U5 R4 C17 + JP11 JP10 PSEL JP3 SO4 JP9 R17 Figure 3.
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www.ti.com Schematic, BOM, and Printed-Circuit Board Figure 5.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.