Texas Instruments PCM1808EVM Manuale utente

SBAU349–June 2020

PCM1808 Evaluation Module

User's Guide

SBAU349–June 2020

PCM1808 Evaluation Module

This user's guide describes the function and use of the PCM1808EVM. This document includes the

hardware configuration instructions, a quick-start guide, jumper and connector descriptions, schematics,

and printed-circuit board (PCB) layout that demonstrate TI's recommended practices for these devices.

Contents

1 Introduction ................................................................................................................... 2

2 Power Supply................................................................................................................. 2

3 Hardware Configuration..................................................................................................... 2

4 Interfacing With the EVM ................................................................................................... 3

5 Board Layout ................................................................................................................. 4

6 Schematic and Bill of Materials ............................................................................................ 7

7 Related Documentation..................................................................................................... 8

List of Figures

1 PCM1808EVM Top Layer .................................................................................................. 4

2 PCM1808EVM Power Plane 1............................................................................................. 5

3 PCM1808EVM Power Plane 2............................................................................................. 5

4 PCM1808EVM Bottom Layer .............................................................................................. 6

5 PCM1808EVM Schematic.................................................................................................. 7

List of Tables

1 PCM1808EVM Headers and Jumpers.................................................................................... 2

2 PCM1808 Mode Settings................................................................................................... 2

3 PCM1808 Format Settings ................................................................................................. 3

4 Bill of Materials............................................................................................................... 8

Trademarks

All trademarks are the property of their respective owners.

Introduction

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PCM1808 Evaluation Module

1 Introduction

The PCM1808EVM is an evaluation module (EVM) designed to demonstrate the performance and

functionality of the PCM1808 device. The PCM1808 is a high-performance, low-cost, single-chip, stereo

analog-to-digital converter (ADC) with single-ended analog voltage input. The device is configured through

logic-level mode selection pins and does not require a digital interface such as I2C or SPI to configure

registers. As such, no software is necessary to interface with the EVM. The EVM is powered with a single

5-V supply. Access to the converter output is provided on the audio serial interface in I2S and LJ formats.

2 Power Supply

The PCM1808EVM is powered with a single 5-V power supply connected to J11. An onboard low-dropout

regulator converts the 5-V supply to the 3.3-V rail used by the ADC. The analog supply, VCC, is fixed at 5-

V and the digital supply, VDD, at 3.3 V. The power status of the EVM is indicated by LED (D1), which will

illuminate when power is applied to the board.

3 Hardware Configuration

The format of the audio data and the operating mode of the ADC are controlled by the following pins:

MD0, MD1, and FMT. These signals are referenced to VDD and can be set to high (1) or low (0). If no

shunt is installed, then an internal 50-kΩpulldown resistor will set the pin low so that the ADC remains in

a defined state. Table 1 shows the header numbers and their pin functions and Table 2 and Table 3 show

the possible modes and output formats, respectively. In master mode, BCK and LRCK are outputs

generated by internal divider circuitry from the SCKI input. Thus, SCKI must be a valid multiple of the

intended sample rate. MD0 and MD1 are used to select the serial audio data communication timing and

must be set prior to power on. The frequency of BCK is constant at 64 BCK/frame. In slave mode, BCK

and LRCK work as input pins. The device accepts 64-BCK/frame or 48-BCK/frame format (only for a 384

fs system clock), but not 32-BCK/frame format. Although BCK and LRCK are no longer derived from SCKI

in slave mode, a valid SCKI is still required for operation.

Table 1. PCM1808EVM Headers and Jumpers

Designator Function

J1 Audio serial interface: system clock input

J2 Audio serial interface: bit-clock input or output

J3 Audio serial interface: latch-enable input or output

J4 Audio serial interface: digital data output

J5 System clock source

J6 FMT select

J7 MD1 select

J8 MD0 select

J9 Analog audio input: right

J10 Analog audio input: left

J11 +5-V supply input

Table 2. PCM1808 Mode Settings

MD1 MD0 Interface Mode

0 0 Slave mode (256 fs, 384 fs, 512 fs auto-detection)

0 1 Master mode (512 fs)

1 0 Master mode (384 fs)

1 1 Master mode (256 fs)

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Interfacing With the EVM

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PCM1808 Evaluation Module

Table 3. PCM1808 Format Settings

FMT Format

0 I2S, 24bit

1 Left-justified, 24 bit

All hardware pins are tied low by default, placing the device in slave mode and I2S, 24-bit audio format.

For more information on the operating modes and clock timing of the PCM1808 device, see the PCM1808

Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo ADC Data Sheet.

4 Interfacing With the EVM

4.1 PCM1808EVM Inputs

The right and left audio inputs to the PCM1808EVM can be applied through the RCA connectors (J9 and

J10, respectively) or directly to the test points (TP4 and TP5, respectively). The single-ended audio inputs

pass through an optional anti-aliasing filter made by R9 and C8 for the right input and R10 and C10 for the

left input. The capacitors can be left de-populated and the resistors replaced with 0-Ωresistors if the filter

is not desired. An input high-pass filter is created by the 1-µF capacitors (C1 and C9) and 60-kΩinput

impedance.

4.2 PCM1808EVM Output

The digital I/O of the PCM1808EVM are provided by J1 through J4; the functions are outlined in Table 1.

The first two pins of each header are duplicated signals to allow for signal input and monitoring. The third

pin of each is connected to GND.

Board Layout

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PCM1808 Evaluation Module

5 Board Layout

Figure 1 to Figure 4 illustrate the EVM board layout.

Figure 1. PCM1808EVM Top Layer

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Board Layout

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PCM1808 Evaluation Module

Figure 2. PCM1808EVM Power Plane 1

Figure 3. PCM1808EVM Power Plane 2

Board Layout

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PCM1808 Evaluation Module

Figure 4. PCM1808EVM Bottom Layer

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Schematic and Bill of Materials

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PCM1808 Evaluation Module

6 Schematic and Bill of Materials

This section contains the EVM schematic and bill of materials.

6.1 Schematic

Figure 5 illustrates the EVM schematic.

Figure 5. PCM1808EVM Schematic

Schematic and Bill of Materials

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PCM1808 Evaluation Module

6.2 Bill of Materials

Table 4 lists the EVM bill of materials.

Table 4. Bill of Materials

Designator QTY Description Part Number Manufacturer

!PCB1 1 Printed Circuit Board DC015 Any

C1, C9 2 CAP, CERM, 1 uF, 16 V, ±10%, X7R, 0805 GRM21BR71C105KA01L MuRata

C2, C4, C6 3 CAP, CERM, 10 uF, 16 V, ±10%, X7R, 0805 CL21B106KOQNNNE Samsung Electro-

Mechanics

C3, C5, C7 3 CAP, CERM, 0.1 uF, 50 V, ±10%, X7R, 0402 C1005X7R1H104K050BB TDK

C8, C10 2 CAP, CERM, 0.01 uF, 50 V, ±10%, X7R, 0805 08055C103KAT2A AVX

C11, C15,

C18 3 CAP, CERM, 0.1 uF, 16 V, ±10%, X7R, 0402 GCM155R71C104KA55D MuRata

C12, C13 2 CAP, CERM, 33 pF, 50 V, ±5%, C0G/NP0, 0402 C1005C0G1H330J050BA TDK

C14, C17 2 CAP, CERM, 10 uF, 16 V, ±20%, X5R, 0603 GRM188R61C106MAALD MuRata

C16 1 CAP, CERM, 0.01 uF, 16 V, ±10%, X5R, 0402 GRM155R61C103KA01D MuRata

D1 1 LED, Green, SMD LTST-C170KGKT Lite-On

H1, H2, H3,

H4 4 Bumpon, Hemisphere, 0.25 X 0.075, Clear SJ5382 3M

J1, J2, J3,

J4, J5, J6,

J7, J8

8 Header, 100mil, 3x1, Gold, TH TSW-103-07-G-S Samtec

J9 1 RCA Jack, 1Pos, Tin, Red, R/A, TH RCJ-012 CUI Inc.

J10 1 RCA Jack, 1Pos, Tin, White, R/A, TH RCJ-013 CUI Inc.

J11 1 Terminal Block, 3.5mm Pitch, 2x1, TH ED555/2DS On-Shore Technology

L1 1 Ferrite Bead, 220 ohm @ 100 MHz, 2.2 A, 0603 MPZ1608S221A TDK

R1, R2, R3,

R4 4 RES, 47.0, 1%, 0.1 W, 0603 RC0603FR-0747RL Yageo

R5 1 RES, 442, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW0603442RFKEA Vishay-Dale

R6, R7, R8 3 RES, 10.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW060310K0FKEA Vishay-Dale

R9, R10 2 RES, 100, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 CRCW0805100RFKEA Vishay-Dale

R11 1 RES, 1.0 M, 5%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW04021M00JNED Vishay-Dale

R12 1 RES, 0, 5%, 0.063 W, 0402 RC0402JR-070RL Yageo America

SH1, SH2,

SH3, SH4 4 Shunt, 100mil, Gold plated, Black SNT-100-BK-G Samtec

TP1, TP2,

TP3 3 Test Point, Miniature, Yellow, TH 5004 Keystone

TP4 1 Test Point, Compact, Red, TH 5005 Keystone

TP5 1 Test Point, Compact, White, TH 5007 Keystone

TP6, TP7 2 Test Point, Miniature, Black, TH 5001 Keystone

U1 1 99dB SNR Stereo ADC with Single-Ended Inputs, PW0014A

(TSSOP-14) PCM1808PWR Texas Instruments

U2 1 Crystal Oscillator Driver, DCK0006A (SOT-SC70-6) SN74LVC1GX04DCKR Texas Instruments

U3 1 Single Output Low Noise LDO, 400 mA, Fixed 3.3 V Output,

1.7 to 5.5 V Input, with Reverse Current Protection, 5-pin

SOT-23 (DBV), -40 to 85 degC, Green (RoHS & no Sb/Br)

TPS73633DBVR Texas Instruments

Y1 1 Crystal, 12.288 MHz, 20 pF, SMD ECS-122.8-20-5PX-TR ECS Inc.

7 Related Documentation

1. Texas Instruments, PCM1808 Single-Ended, Analog-Input 24-Bit, 96-kHz Stereo ADC Data Sheet

STANDARD TERMS FOR EVALUATION MODULES

1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or

documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance

with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.

1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility

evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not

finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For

clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions

set forth herein but rather shall be subject to the applicable terms that accompany such Software

1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,

or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production

system.

2Limited Warranty and Related Remedies/Disclaimers:

2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License

Agreement.

2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM

to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by

neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have

been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications

or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control

techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.

User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)

business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.

2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit

User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty

period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or

replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be

warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day

warranty period.

WARNING

Evaluation Kits are intended solely for use by technically qualified,

professional electronics experts who are familiar with the dangers

and application risks associated with handling electrical mechanical

components, systems, and subsystems.

User shall operate the Evaluation Kit within TI’s recommended

guidelines and any applicable legal or environmental requirements

as well as reasonable and customary safeguards. Failure to set up

and/or operate the Evaluation Kit within TI’s recommended

guidelines may result in personal injury or death or property

damage. Proper set up entails following TI’s instructions for

electrical ratings of interface circuits such as input, output and

electrical loads.

NOTE:

EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION

KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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3Regulatory Notices:

3.1 United States

3.1.1 Notice applicable to EVMs not FCC-Approved:

FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software

associated with the kit to determine whether to incorporate such items in a finished product and software developers to write

software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or

otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition

that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.

Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must

operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.

3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:

CAUTION

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not

cause harmful interference, and (2) this device must accept any interference received, including interference that may cause

undesired operation.

Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to

operate the equipment.

FCC Interference Statement for Class A EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not

installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.

Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to

correct the interference at his own expense.

FCC Interference Statement for Class B EVM devices

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of

the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential

installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance

with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference

will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which

can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more

of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

3.2 Canada

3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247

Concerning EVMs Including Radio Transmitters:

This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:

(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may

cause undesired operation of the device.

Concernant les EVMs avec appareils radio:

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation

est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit

accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concerning EVMs Including Detachable Antennas:

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)

gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type

and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for

successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types

listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.

Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited

for use with this device.

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