Texas Instruments PCM1792 User manual

 
 
 
July 2003 Audio Converter Products, Digital Audio
User’s Guide
SLEU037

IMPORTANT NOTICE
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Copyright 2003, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
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machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of "15 V and the output
voltage range of "15 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
55°C. The EVM is designed to operate properly with certain components above 55°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2003, Texas Instruments Incorporated

Related Documentation From Texas Instruments
v
Preface
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About This Manual
This document provides a description and instructions for use of an EVM
board for the PCM1792, DSD1792, PCM1794, and DSD1794 stereo audio
DACs.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Description
-Chapter 2—Schematic and Printed-Circuit Board
Related Documentation From Texas Instruments
-DSD1792 24-Bit, 192-kHz Sampling, Advanced Segment, Audio Stereo
Digital-to-Analog Converter data sheet, SLES067
-PCM1792 24-Bit, 192-kHz Sampling, Advanced Segment, Audio Stereo
Digital-to-Analog Converter data sheet, SLES069
-DSD1794 24-Bit, 192-kHz Sampling, Advanced Segment, Audio Stereo
Digital-to-Analog Converter data sheet, SLES077
-PCM1794 24-Bit, 192-kHz Sampling, Advanced Segment, Audio Stereo
Digital-to-Analog Converter data sheet, SLES080
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

Trademarks
vi
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Trademarks
Microsoft is a registered trademark of Microsoft Corporation.
Windows is a registered trademark of Microsoft Corporation.
Other trademarks are the property of their respective owners.

Contents
vii
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1 Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 DEM-PCM/DSD1792/1794 Power Supply Connection 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 S/PDIF Connection 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Audio Output Connection 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 Configuration Control 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.1 DAI Receiver Data Format 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.2 Reset of DAI Receiver IC 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.3 DAI Interface Selection 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.4 PCM Audio/DSD Interface 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.5 Analog Output Selection 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.6 Hardware Control Switches S01−S07 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.7 CN-2 I2C Interface/Zero Out 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 Demo Software 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 DEM-PCM/DSD1792/1794 Parts List (BOM) 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Schematic and Printed-Circuit Board 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 DEM-PCM/DSD1792/1794 Printed-Circuit Board 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 DEM-PCM/DSD1792/1794 Schematics 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
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1−1 DEM-PCM/DSD1792/1794 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1−2 CN001 Connection 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1−3 CN-2 Connection 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−1 DEM-PCM/DSD1792/1794 Silkscreen 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 DEM-PCM/DSD1792/1794—Top View 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−3 DEM-PCM/DSD1792/1794—Bottom View 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−4 DEM-PCM/DSD1792/1794 DAC, Analog Section 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−5 DEM-PCM/DSD1792/1794 Power-Supply Section 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−6 DEM-PCM/DSD1792/1794 Digital Section 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1−1 Digital Audio Receiver Configuration 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1−2 Digital Audio Source Selection 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1−3 Audio Data Format Select 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Description
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The DEM-PCM/DSD1792/1794 is an evaluation module for the PCM1792
(DEM-PCM1792), DSD1792 (DEM-DSD1792), PCM1794 (DEM-PCM1794)
and DSD1794 (DEM-DSD1794) stereo audio DACs. For the PCM devices,
this EVM board accepts 24-bit linear PCM data at sampling rates up to fS= 96
kHz via the S/PDIF interface. For the non-S/PDIF interface, at a sampling rate
of fS = 192 kHz, 24-bit PCM data or 64-fS, 1-bit DSD data can be interfaced
directly at a connector on the board.
The DEM-PCM/DSD1792/1794 uses an NE5534 op amp for I/V conversion
in the analog output circuit to obtain excellent audio performance. There are
three analog signal output functions onboard as 2-V rms single-ended (RCA),
4.5-V rms single-ended (RCA), and 9-V rms balanced (XLR).
The DEM-PCM/DSD1792/1794 is operated by a ±15-V analog power supply,
5-V DAC power supply and 5-V digital power supply. A single 5-V power supply
can be used to power the DAC and digital circuitry by setting a jumper
connection, but to obtain the specified audio performance, use of separate
power supplies is recommend.
Typical audio performance is as follows:
THD+N = 0.0004%
Dynamic range (EIAJ) = 128 dB (4 V rms)
Dynamic range (EIAJ) = 125 dB (2 V rms)
Topic Page
1.1 Block Diagram 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 DEM-PCM/DSD1792/1794 Power Supply Connection 1-2. . . . . . . . . . . . .
1.3 S/PDIF Connection 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Audio Output Connection 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 Configuration Control 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 Demo Software 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.7 DEM-PCM/DSD1792/1794 Parts List (BOM) 1-7. . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Block Diagram
1-2
1.1 Block Diagram
Figure 1−1.DEM-PCM/DSD1792/1794 Block Diagram
DAI
CS8414
DAC
PCM1792
DSD1792
PCM1794
DSD1794
CN001
LPF
5534
SW
REG Cont
+5 V
Digital
Lch OUT
BAL OUT
(MONO)
Lch LPF
OUT
COAX IN
OPT IN
JP
Rch OUT
Rch LPF
OUT
BAL
5534
I/V
5534
I/V
5534
SW
Mode Cont
3.3 V REG
REG1117 3.3 V REG REG1117
+5 V
Analog −15 V Analog +15 V Analog
I/V
5534
I/V
5534
BAL
5534
JP LPF
5534
1.2 DEM-PCM/DSD1792/1794 Power Supply Connection
-Connect the ±15-V analog power supply to TM5 (−VA), TM6 (AGND), and
TM7 (+VA). Power supply current is typically ±40 mA, maximum ±70 mA.
-Connect the 5-V DAC power supply to TM4 (+VCC) and TM3 (AGND). A
3.3-V regulator IC is connected to provide a 3.3-V power supply for the
DAC device. Power supply current is typically 50 mA, maximum 60 mA (at
fS= 44.1 kHz).
-Connect the 5-V digital power supply at TM2 (+VDD) and TM1 (DGND).
A 3.3-V regulator IC is connected to provide a 3.3-V logic supply to the
digital section. Power supply current is typically 70 mA, max +120 mA.
-Jumper JP-P is for the selection of separate 5-V +VCC and +VDD power
supplies, or a common 5-V power supply.
J1−2: Separate power supplies
J3−4: Common power supply; connect 5 Vto either TM4 (+VCC) or TM2
(+VDD).
1.3 S/PDIF Connection
Connect the S/PDIF interface at either PJ-1 (RCA phono jack, coaxial cable)
or U001 (optical cable). The DEM-PCM/DSD1792/1794 accepts sampling
rates up to fS= 96 kHz at the S/PDIF interface. The optical input or coaxial
input is automatically detected by the DAI receiver. For the fS= 192-kHz