Texas Instruments PCM1681 User Manual
DEM-DAI1681
PCM1681 Evaluation Module
User's Guide
Literature Number: SBAU137
April 2008
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2 SBAU137 – April 2008
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Contents
3
Contents
Preface ............................................................................................................................................................ 7
1
Description .......................................................................................................................................... 9
1.1
Functional Block Diagram .................................................................................................................................. 10
1.2
EVM Description ................................................................................................................................................. 10
1.3
Basic Connection and Operation ........................................................................................................................ 11
1.4
EVM Configuration Controls ............................................................................................................................... 11
1.4.1
Jumper Controls ..................................................................................................................................... 11
1.4.2
Switch Controls....................................................................................................................................... 12
1.4.3
DEM-PCM1681 Daughtercard Configuration Controls ........................................................................... 13
1.5
Electrostatic Discharge Warning ........................................................................................................................ 13
1.6
Absolute Maximum Ratings ................................................................................................................................ 14
2
Demonstration Software .................................................................................................................. 15
2.1
Overview ............................................................................................................................................................ 16
2.2
Installation .......................................................................................................................................................... 16
2.3
Using the Demonstration Software ..................................................................................................................... 17
2.3.1
HOLD and PASS .................................................................................................................................... 19
2.3.2
Applicable Function Control .................................................................................................................... 19
3
Typical Performance and Measurement Examples ....................................................................... 21
3.1
Typical Device Performance .............................................................................................................................. 22
3.2
Measurement Examples ..................................................................................................................................... 23
4
Schematic, PCB Layout, and Bill of Materials ............................................................................... 27
4.1
DEM-DAI/MDAC Schematics ............................................................................................................................. 28
4.2
DEM-PCM1681 Schematic ................................................................................................................................. 31
4.3
Printed Circuit Board Layout—DEM-DAI/MDAC ................................................................................................ 32
4.4
Printed Circuit Board Layout—DEM-PCM1681 .................................................................................................. 35
4.5
Component Lists ................................................................................................................................................ 37
4.5.1
Bill of Materials for DEM-DAI/MDAC ...................................................................................................... 37
4.5.2
Bill of Materials for DEM-PCM1681 ........................................................................................................ 39
Important Notices ........................................................................................................................................ 40
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List of Figures
1-1
DEM-DAI1681 Functional Block Diagram .......................................................................................................... 10
1-2
Jumper JP001 .................................................................................................................................................... 11
2-1
Demonstration Software Window ....................................................................................................................... 17
2-2
Attenuation Control ............................................................................................................................................. 18
2-3
Operation Control ............................................................................................................................................... 18
2-4
Function Control ................................................................................................................................................. 18
3-1
PCM1681 Performance vs fS (Sampling Rate) and f
3-2
THD+N vs Input Level ........................................................................................................................................ 23
3-3 FFT (0 dB) .......................................................................................................................................................... 23
3-4 FFT (–60 dB) ...................................................................................................................................................... 24
3-5 FFT (–90 dB) ...................................................................................................................................................... 24
3-6
FFT (BPZ) .......................................................................................................................................................... 25
3-7
Out-of-Band Noise vs System Clock and Oversampling Condition .................................................................... 25
4-1
Low-Pass Filter Schematic ................................................................................................................................. 28
4-2
Daughtercard Sockets, Connector, and Regulator Schematic ........................................................................... 29
4-3
Digital Audio Interface Schematic ...................................................................................................................... 30
4-4
PCM1681 Daughtercard Schematic ................................................................................................................... 31
4-5
DEM-DAI/MDAC Board Layout—Silkscreen ...................................................................................................... 32
4-6
DEM-DAI/MDAC Board Layout—Top (Component) Side .................................................................................. 33
4-7
DEM-DAI/MDAC Board Layout—Bottom View ................................................................................................... 34
4-8
DEM-PCM1681 Board Layout—Silkscreen ........................................................................................................ 35
4-9
DEM-PCM1681 Board Layout—Top (Component) Side .................................................................................... 35
4-10
DEM-PCM1681 Board Layout—Bottom View .................................................................................................... 36
4 List of Figures SBAU137 – April 2008
(System Clock)............................................................ 22
SYS
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List of Tables
1-1
SW006: Data Format Selection in Hardware Control Mode for PCM1681 ......................................................... 12
1-2
SW006: De-Emphasis and Mute Selection in Hardware Control Mode for PCM1681 ....................................... 12
1-3
SW001/002/003: Format Selection for CS8414 (Digital Audio I/F Receiver) ..................................................... 12
1-4
HDR001: Signal Path Selection for Pin 1 of PCM1681 ...................................................................................... 13
1-5
HDR002: Mode Control Selection of PCM1681 ................................................................................................. 13
1-6
EVM Absolute Maximum Ratings ....................................................................................................................... 14
2-1 Applicable Function Control Summary ............................................................................................................... 19
4-1
Bill of Materials—DEM-DAI/MDAC ..................................................................................................................... 37
4-2
Bill of Materials—DEM-PCM1681 ...................................................................................................................... 39
SBAU137 – April 2008 List of Tables 5
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6 List of Tables SBAU137 – April 2008
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About This Manual
This document provides the information needed to set up and operate the DEM-DAI1681, a test platform
for the eight-channel, 24-bit PCM1681
subset of user-programmable functions through a parallel control port, in addition to a full set of
user-programmable functions through a serial control port, SPI™, or I2C™. It also contains instructions to
connect and set up the DEM-DAI1681 for operation, and for the installation and use of the software that
controls the demonstration board. For a more detailed description of the PCM1681 product line, refer to
the product data sheet available from the Texas Instruments web site at http://www.ti.com
documents are listed in the section of this guide entitled Related Documentation from Texas
Instruments.
How to Use This Manual
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the DEM-DAI1681 evaluation module.
Chapter 1 discusses the block diagram and primary features of the DEM-DAI1681. This chapter also
provides general information regarding the default switch and jumper configurations.
Chapter 2 explains how to use the software provided with the DEM-DAI1681.
Chapter 3 presents measured typical performance and characteristic data for the PCM1681 when used
with the DEM-DAI1681.
Chapter 4 includes the EVM electrical schematics, printed circuit board (PCB) layout, and the bills of
materials.
Preface
SBAU137 – April 2008
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audio digital-to-analog converter (DAC). The PCM1681 provides a
. Support
Information About Cautions and Warnings
This document contains caution statements.
This is an example of a caution statement. A caution statement describes a
situation that could potentially damage your software or equipment.
The information in a caution or a warning is provided for your protection. Please read each caution and
warning carefully.
SYS-2722 is a registered trademark of Audio Precision, Inc.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
2
I
C is a trademark of NXP Semiconductors.
TOSLINK is a registered trademark of Toshiba Corporation.
All other trademarks are the property of their respective owners.
CAUTION
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Data Sheet
Literature Number
Related Documentation From Texas Instruments www.ti.com
Related Documentation From Texas Instruments
The following documents provide information regarding Texas Instruments integrated circuits used in the
assembly of the DEM-DAI1681. These documents are available from the TI web site
the literature number corresponds to the document revision that is current at the time of the writing of this
User’s Guide. Newer revisions may be available from the TI web site at
Texas Instruments Literature Response Center at (800) 477–8924 or the Product Information Center at
(972) 644–5580. When ordering, identify the document(s) by both title and literature number.
PCM1681 Product data sheet SLES211
http://www.ti.com/ or call the
. The last character of
If You Need Assistance
If you have questions regarding either the use of this evaluation module or the information contained in the
accompanying documentation, please contact the Texas Instruments Product Information Center at (972)
644–5580 or visit the TI web site at www.ti.com
FCC Warning
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can
radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense is required to
take whatever measures may be required to correct this interference.
.
Trademarks
All trademarks are the property of their respective owners.
8 Read This First SBAU137 – April 2008
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Description
11
Chapter 1
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Description
The DEM-DAI1681 is an evaluation board for the PCM1681, a 24-bit, 192-kHz, 8-channel audio DAC with
digital audio receiver, 8-channel second-order post filter, mode control interface to a personal computer
(PC), and various switches and jumpers for configuration controls.
The DEM-DAI1681 operates from 5-V and ±15-V analog power supplies with an S/PDIF input signal.
Project collateral discussed in this user’s guide can be downloaded from the following
URL: http://www.ti.com/lit/zip/SBAU137
Topic Page
.
1.1
1.2
1.3
1.4
1.5
1.6
Functional Block Diagram ........................................................................ 10
EVM Description ........................................................................................ 10
Basic Connection and Operation ............................................................ 11
EVM Configuration Controls .................................................................... 11
Electrostatic Discharge Warning ............................................................. 13
Absolute Maximum Ratings ..................................................................... 14
10
Description
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DEM-DAI/MDAC Motherboard
Ch 7
Ch 8
External-I/F
(CN004)
Ch 5
Ch 6
Ch 3
Ch 4
DAC
PCM1681
CLKO
DATA4
DAI
(Bus)
Select
DIR
Ch 1
Ch 2
2nd-order LPF
L/R
L/R
L/R
L/R
order LPF
(DEM-1681
Daughtercard)
CS8414
Coax
Logic
SCLK
OPT
JUMPER
Format Control
+5 V
3.3 V
REG
SW006
Mode Control Interface to PC
ML MC MDI RST MDO
GND+5 V −15 V GND+15 V
Functional Block Diagram www.ti.com
1.1
Functional Block Diagram
Figure 1-1 illustrates the functional block diagram of the DEM-DAI1681.
M2, M1, M0
-ch
BCLK
and
LRCK
DATA1
DATA2
DATA3
-ch
-ch
-ch
OPA2134
(fC = 54 kHz)
2nd-order LPF
OPA2134
(f
= 54 kHz)
C
2nd-order LPF
OPA2134
= 54 kHz)
(f
C
2nd-
OPA2134
= 54 kHz)
(f
C
1.2
Figure 1-1. DEM-DAI1681 Functional Block Diagram
EVM Description
The DEM-DAI1681 EVM is shipped with the following items:
• EVM Motherboard: DEM-DAI/MDAC
• EVM Daughtercard: DEM-PCM1681
• CD-ROM containing application software, a copy of this user's guide, and a PCM1681 product data
sheet
If any of these items are missing or damaged, please contact your local Texas Instruments representative.
This EVM consists of two PCBs. The DEM-DAI/MDAC motherboard is a common PCB for similar devices
such as the DEM-DAI1608 and the DEM-DAI1680
. The DEM-PCM1681 daughtercard contains the
PCM1681 DAC device, as shown in Figure 1-1.
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Description
11
www.ti.com Basic Connection and Operation
1.3
Basic Connection and Operation
• Set/confirm jumper JP001 to provide the system clock and other digital signals from the digital audio
receiver to the PCM1681.
• Set/confirm jumper JP201–JP224 to select the cutoff frequency of the second-order post low-pass filter
(LPF) for DAC outputs.
• Set/confirm jumper HDR002 and HDR001 of the PCM1681 daughtercard to select mode control and
coressponding primary pin function.
• Connect the +5-V and ±15-V power supplies to V
, AVCC, –AVCC, and GND on connectors
CC
CN051–CN055.
• Connect the S/PDIF signal into CN001 (COAX) or U001 (OPT).
• Connect the PC printer port to CN003 for mode control, if required.
• Set/confirm the input data format using SW001–SW003 and SW006 (H/W control mode) or the
demonstration software (S/W SPI control).
1.4
EVM Configuration Controls
1.4.1
Jumper Controls
The following jumpers are provided onboard for configuration controls:
• JP001: Set Interface of Digital Signal from DIR to DAC (the device under test [DUT])
The digital signal generated by the digital interface receiver (DIR) is input to this jumper. For each
shorted pin, the corresponding digital signal is applied to the PCM1681. All signals except for BCK and
BCK [L/J] must be shorted for normal operation using the DIR; for BCK and BCK [L/J], one or the other
must be shorted according to the data format selection of the DIR. Figure 1-2 shows jumper JP001.
JP001
SCLK
CLKO
GND
BCK
BCK [L/J]
LRCK
DATA1
DATA2
DATA3
DATA4
Figure 1-2. Jumper JP001
• JP201–JP224 (24 Pieces): Set f
These jumpers determine the corner frequency (f
–
JP201–JP224 shorted: fC = 54 kHz for BW = 20 kHz
–
JP201–JP224 open: fC = 108 kHz for BW = 40 kHz
(Corner Frequency) Selection of Second-Order Post LPF
C
) of the second-order post low-pass filter.
C
12
Description
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Off (H)
On (L)
16-bit to 24-bit, Left-Justified Format
Off (H)
Off (H)
Mute On, De-Emphasis 44.1 kHz On
SW003 (M2)
SW002 (M1)
SW001 (M0)
Data Format Selection
(1)
EVM Configuration Controls www.ti.com
1.4.2
Switch Controls
The following switches, summarized in Table 1-1 to Table 1-3, are provided onboard for EVM control.
Table 1-1. SW006: Data Format Selection in Hardware Control Mode for PCM1681
FMT1 (as S4/ML) FMT0 (as S1/RST) Data Format Selection
On (L) On (L) 24-bit, Right-Justified Format
On (L) Off (H) 16-bit to 24-bit, I2S Format
Off (H) Off (H) 24-bit, I2S Mode TDM Format
Table 1-2. SW006: De-Emphasis and Mute Selection in Hardware Control Mode for PCM1681
MUTE (as S2/MDI) DEMP (as S3/MC) De-Emphasis and Mute Selection
On (L) On (L) Mute Off, De-Emphasis Off
On (L) Off (H) Mute Off, De-Emphasis 44.1 kHz On
Off (H) On (L) Mute On, De-Emphasis Off
Table 1-3. SW001/002/003: Format Selection for CS8414 (Digital Audio I/F Receiver)
L
L
H
(1)
BCK of JP001 selection. When Left-Justified data format is used, move the jumper from BCK to BCK [L/J] for the JP001 setting.
L
H
L
L
16-bit to 24-bit, Left-Justified
L
16-bit to 24-bit, l2S
H
16-bit, Right-Justified
SW004: Manual reset for CS8414
SW005: Digital Audio Interface Selection
• Internal—CS8414
• External—(CN004)
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Description
13
HDR002
Mode Control of PCM1681
1-2
3-4
5-6
7-8
Open
Open
Open
Short
S/W (SPI) Control Mode
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1.4.3
DEM-PCM1681 Daughtercard Configuration Controls
This section discusses the headers that are provided as configuration controls for the PCM1681
daughtercard.
1.4.3.1
HDR001: Select Signal Path for Pin 1 of PCM1681
Either 1-2 or 3-2 must be shorted according to the function of pin 1 of the PCM1681, which is determined
by the HDR002 setting. Table 1-4 summarizes the select signal path configuration for HDR002.
Short Open Path for ZR1 output for S/W (SPI and I2C) Control Mode
Open Short Path for FMT0 input for H/W Control Mode
Table 1-4. HDR001: Signal Path Selection for Pin 1 of PCM1681
HDR001
Signal Path for Pin 1 of PCM1681 1-2 3-2
1.4.3.2
HDR002: Select Mode Control of PCM1681
Either 1-2, 3-4, 5-6, or 7-8 must be shorted in order to select mode control type and oversampling
condition of the PCM1681. Table 1-5 summarizes the mode control selection configuration for HDR002.
Table 1-5. HDR002: Mode Control Selection of PCM1681
1.5
Short Open Open Open S/W (I2C) Control Mode
Open Short Open Open H/W Control Mode with Narrow Band Operation
Open Open Short Open H/W Control Mode with Wide Band Operation
Electrostatic Discharge Warning
Many of the components on the DEM-DAI1681 are susceptible to damage by electrostatic discharge
(ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling
the EVM, including the use of a grounded wrist strap at an approved ESD workstation.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.
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