Reference Design for the TAS5026 Digital Audio
PWM Processor
User’s Guide
April 2003Digital Audio/Application
SLEU035
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Mailing Address:
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Post Office Box 655303
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Copyright 2003, Texas Instruments Incorporated
About This Manual
This manual describes the T AS5026REF reference design from T exas Instruments.
How to Use This Manual
Information About Cautions and Warnings
Preface
Read This First
This document contains the following chapters:
- Chapter 1 – Introduction
- Chapter 2 – System Interfaces
- Chapter 3 – Schematic, Parts List, PCB Specification, and PCB Layout
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you
.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
iii
Related Documentation From Texas Instruments
Related Documentation From Texas Instruments
The following is a list of data manual that have detailed descriptions of the
integrated circuits used in the design of the T AS5026REF evaluation module.
The data manuals can be obtained at the URL http://www.ti.com
The true digital audio amplifiers (TDAA) system consists of a PCM-PWM
modulator device and a PWM power output device. The PCM-PWM processor
accepts a serial PCM digital audio stream and converts it to a 3.3-V PWM
audio stream. The TDAA output stage provides a large-signal PWM output.
The digital PWM signal is then demodulated, providing power output for
driving loudspeakers. This patented technology provides low cost, high
quality, highly efficient digital audio applicable to many audio systems
developed for the digital age.
The TAS5026REF reference design demonstrates the integrated circuit
T AS5026 from Texas Instruments (TI). The TAS5026 is a 24-bit multichannel
digital pulse width modulator based on Equibit technology . The TAS5026 is
designed to drive up to six digital power devices to provide six channels of
digital audio amplification. The digital power devices can be conventional
monolithic power stages (such as the TAS5110 or the TAS5112) or discrete
differential power stages using gate drivers and MOSFETs.
The T AS5026 has six independent volume controls with soft volume and mute.
The T AS5026 supports bridged output configurations. The device operates in
AD mode (2-level modulation scheme). This all-digital audio system contains
only two analog components in the signal chain – an LC low-pass filter at each
speaker terminal. The TAS5026 provides up to 96-dB SNR at the speaker
terminals. The TAS5026 has a wide variety of serial input options including
right justified (16, 20, or 24 bit), I2S (16, 20, or 24 bit), left justified, or DSP (16
bit) data formats. It is fully compatible with AES standard sampling rates of
44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz, including de-emphasis for 44.1-kHz
and 48-kHz sample rates. The T AS5026 plus the TAS51xx power stage device
combination can be used in a wide range of applications such as
microcomponent systems, home theater in a box (HTIB), DVD receivers, A/V
receivers, or TV sets.
Together with the TAS5110D6REF or the TAS5112D6REF module, the
T AS5026REF module is a complete true digital audio amplifier system, which
includes digital volume control, headphone amplifier, and a subwoofer output.
Figure 1–1.TDAA System With TAS5026REF and TAS5110D6REF Reference Designs
Digital
Audio
Interface
Control
Interface
I2S Bus
I2C Bus
Control Interface
1.1TAS5026REF Features
- Six channel TDAA reference design (double-sided plated-through PCB
layout)
- Supports noiseless self-contained protection system (short circuit and
thermal) for the TAS5110 and the TAS5182 output stages. The
autorecovery loop is closed when JMP120 and JMP121 are shorted.
- Onboard headphone amplifier
TAS5026DREF
Module
PWM Interface
TAS5110D6REF
Module
1-2
1.2PCB Key Map
The physical structure for the TAS5026REF is illustrated in Figure 1–2.
Figure 1–2.Physical Structure for the TAS5026REF (Rough Outline)
PWM Interface
(J140)
Head–
Phone
Out
(J320)
Headphone Amplifier
Section
1.3Jumper Settings
Together with the TAS5100/TAS5110/TAS5182 PWM output stages from
Texas Instruments, the TAS5026REF module can be configured in
autorecovery mode (closed loop). The SHUTDOWN
stage is connected to error recovery at the PWM processor when JMP120 and
JMP121 are shorted.
The autorecovery loop has to be disabled when the modulator board is
connected to an output stage module with autorecovery on-chip (e.g. the
TAS5111 and the TAS5112 reference modules). Autorecovery is disabled
when JMP120 and JMP 121 are removed.
PWM Processor
Section
Control Interface
(J100)
JMP120
JMP121
Digital Audio Interface
TI
TAS5026REF
(J160)
signal(s) from the output
1-3
1-4
Chapter 2
System Interfaces
This chapter describes the TAS5026REF system interfaces.
The digital audio interface contains digital audio signal data (I2S), clocks, etc.
See the T AS5026 data manual, SLES041, for signal timing and details not explained in this document.
Table 2–1.Digital Audio Interface Pin Connections
Pin No.Net NameDescription
01GNDGround
02MCLK-INNot used
03GND
04SDIN1I2S data 1, channel 1 and 2 (left and right front speakers)
05SDIN2I2S data 2, channel 3 and 4 (left and right rear speakers)
06SDIN3I2S data 3, channel 5 and 6 (center speaker subwoofer)
07GNDGround
08GNDGround
09GNDGround
10GNDGround
11SCLKI2S bit clock (64xFs) used to shift in serial data from SIN1, SDIN2, and SDIN3. SDA TA
12GNDGround
13LRCLKLeft/right clock (Fs) used to indicate left/right data being transmitted in SDATA. The
14GNDGround
15Not usedFor future use
16GNDGround
Ground
is sampled with the rising edge of the SCLK. The I2S format can be changed in the
2
I
C registers.
left channel is transmitted when LRCLK is low and the right channel is transmitted
when LRCLK is high.
sequence before PWM signals are present at the output.
If a quit reset is desired, MUTE should be asserted low before applying
RESET
.
state click and pop free without resetting the I
settings.
Both soft and hard resets stop the output stage from switching and brings
it into a low-low state, meaning the low-side MOSFET in both half
bridges is ON.
mute.
Alternatively, the mute mode can also be initiated through the serial
control interface (I
During power down, all I
If a quit power down is desired, MUTE
applying RESET
select:
88.2 kHz and 96 kHz.
Alternatively, the double-speed mode can also be initiated through the
serial control interface (I
De-emphasis filter select bit 1
DEM-SEL2
0
0
1
1
2
C).
2
.
2
DEM-SEL1
0
1
0
1
C and data bus operations are ignored.
should be asserted low before
Pin Level
Low
High
C).
MODE
De-emphasis disabled
De-emphasis enabled for Fs = 32 kHz
De-emphasis enabled for Fs = 44.1 kHz
De-emphasis enabled for Fs = 48 kHz
2
C (volume) register
I2C Address
1Ah
1Bh
2-3
Table 2–3. Control Interface Pin Connections (Continued)
Pin No.Net NameDescription
19DEM-SEL1De-emphasis filter select bit 1
20SD–E1Shutdown error reporting group 1. The TAS51XX digital output stages
(channel 1, 2, and 5) assert this signal low when an internal error occurs.
This can be due to either an overtemperature protection or an overcurrent
event.
21SD–E2Shutdown error reporting group 2. The TAS51XX digital output stages
(channel 3, 4, and 6) assert this signal low when an internal error occurs.
This can be due to either an overtemperature protection or an overcurrent
event.
22ERROR0Error reporting 0 (ERR0 from the T AS51XX output stages)
23ERROR1Error reporting 1 (ERR1 from the T AS51XX output stages)
24HEADPHONE–DISABLE
25
26GNDGround
27Not usedFor future use
28Not usedFor future use
29Not usedFor future use
30Not usedFor future use
31GNDGround
32GNDGround
33+5VPower supply (out)
34+5VPower supply (out)
GNDGround
Headphone control
Headphone
enable sequence
Headphone
disable sequence
Headphone
disable mode
1.Mute all channels (register address 03h)
2.HEADPHONE–DISABLE
3.Individual channel mute of channels 3–6
(register address 19h).
4.Unmute all channels (register address 03h).
1.Mute all channels (register address 03h)
2.HEADPHONE–DISABLE
3.Unmute of channels 3–6 (register address
19h).
4.Unmute all channels (register address 03h).
0Headphone output disabled.
1Output stage channel 1 and 2 is muted.
Channel 3, 4, 5, and 6 should be muted
through the I
2
C interface.
is asserted high.
is asserted low.
2-4
2.3PWM Interface (J140)
The PWM interface connects the TAS5026REF board to the output stage
module.
Channel 1 PWM input (differential +) – positive H-bridge side
434145
464448
50
4947
2-5
Table 2–4. J100 Pin Description (Continued)
Pin No.Net NameDescription
28PWM–AM–5Channel 5 PWM input (differential –) – positive H-bridge side
29VALID–5Valid channel 5
30PWM–BM–5Channel 5 PWM input (differential –) – negative H-bridge side
31PWM–BP–5Channel 5 PWM input (differential +) – negative H-bridge side
32GNDGround
33PWM–AP–6Channel 6 PWM input (differential +) – positive H-bridge side
34PWM–AM–6Channel 6 PWM input (differential –) – positive H-bridge side
35VALID–6Valid channel 6
36PWM–BM–6Channel 6 PWM input (differential –) – negative H-bridge side
37PWM–BP–6Channel 6 PWM input (differential +) – negative H-bridge side
38SD–E1Shutdown group 1 (center + left and right front speakers)
39SD–E2Shutdown group 2 (subwoofer + left and right rear speakers)
40ERROR0Error signal ERR0 from TAS5110
41ERROR1Error signal ERR1 from TAS5110
42RESETSystem reset (bidirectional)
43PSU–COMP–2For future use
44PSU–COMP–1For future use
45Not UsedFor future use
46Not UsedFor future use
47+3.3V3.3-V supply voltage for the modulator module (e.g., the T AS5026REF)
48GNDGround
49+5V5-V supply voltage
50+5V5-V supply voltage
2-6
Chapter 3
Schematic, Parts List, PCB Specification, and
PCB Layout
The chapter contains the schematic, parts list, PCB specification, and PCB
layout for the TAS5026REF.
3-1
Input & Output Section
TI
TI
TAS5026REF
DIGITAL AUDIO GROUP
DIGITAL AUDIO GROUP
ALL RIGHTS RESERVED - PATENTS PENDING
ALL RIGHTS RESERVED - PATENTS PENDING
TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS INCORPORATED
TAS5026 Section
TI
TI
TAS5026REF
DIGITAL AUDIO GROUP
DIGITAL AUDIO GROUP
ALL RIGHTS RESERVED - PATENTS PENDING
ALL RIGHTS RESERVED - PATENTS PENDING
TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS INCORPORATED
Headphone Amplifier Section
TI
TI
TAS5026REF
DIGITAL AUDIO GROUP
DIGITAL AUDIO GROUP
ALL RIGHTS RESERVED - PATENTS PENDING
ALL RIGHTS RESERVED - PATENTS PENDING
TEXAS INSTRUMENTS INCORPORATED
TEXAS INSTRUMENTS INCORPORATED
TI
TAS5026REF Parts List
Ref DesPart Number DescriptionHousingManufacturerManufacturer Part Number
C100 200041060 10 uF 16 V 20% LYT LY4x5SMD Panasonic ECE V 1C A 100 SR
C140 200041060 10 uF 16 V 20% LYT LY4x5SMD Panasonic ECE V 1C A 100 SR
C200Not usedNot used
C201 200054730 47 nF 16 V 20% X7R 0603 KEMET C0603C473M2RAC
C202 200054720 4.7 nF 50 V 20% X7R 0603 KEMET C0603C473M5RAC
C203 200041060 10 uF 16 V 20% LYT LY4x5SMD Panasonic ECE V 1C A 100 SR
C204 200051040 100 nF 16 V 20% X7R 0603 KEMET C0603C104M4RAC
C205Not usedNot used
C206 200052240 220 nF 10 V 10% X7R 0603 Phycomp 223824615654
C207 200052240 220 nF 10 V 10% X7R 0603 Phycomp 223824615654
C208Not usedNot used
C300 200051040 100 nF 16 V 20% X7R 0603 KEMET C0603C104M4RAC
C320 200064710 470 pF 10% 50 V NP0 0603 KEMET C0603C471K5GAC
C321 200064710 470 pF 10% 50 V NP0 0603 KEMET C0603C471K5GAC
C322 200064710 470 pF 10% 50 V NP0 0603 KEMET C0603C471K5GAC
C323 200064710 470 pF 10% 50 V NP0 0603 KEMET C0603C471K5GAC
C324 200062210 220 pF 10% 50 V NP0 0603 KEMET C0603C221K5GAC
C325 200051040 100 nF 16 V 20% X7R 0603 KEMET C0603C104M4RAC
C326 200041060 10 uF 16 V 20% LYT LY4x5SMD Panasonic ECE V 1C A 100 SR
C327 200062210 220 pF 10% 50 V NP0 0603 KEMET C0603C221K5GAC
C328 200062210 220 pF 10% 50 V NP0 0603 KEMET C0603C221K5GAC
C329 200062210 220 pF 10% 50 V NP0 0603 KEMET C0603C221K5GAC
C330 200051040 100 nF 16 V 20% X7R 0603 KEMET C0603C104M4RAC
C331 200042270 220 uF 6.3 V 20% LYT LY8x9SMD Panasonic EEV F C0 J 221 P
C332DeletedDeleted
C333DeletedDeleted
J100 700820340 Box Header straight 34 pin 2.54 mm IDC34 Multicomp MC9A12-3434
J140 700820500 Box Header straight 50 pin 2.54 mm IDC50 Multicomp MC9A12-5034
J160 700820160 Box Header straight 16 pin 2,54 mm IDC16 Multicomp MC9A12-1634
J320 700353520 Stereo 3,5 mm jack socket Schurter 4832.2320
JMP120 700100020 2 pin 2,54 mm pitch header MX2SI Molex 90120-0122
JMP121 700100020 2 pin 2,54 mm pitch Header MX2SI Molex 90120-0122
PCB900116412P164-PCB-001(3.00)PrintlineP164-PCB-001(3.00)
R100 100210020 10 khm0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R101 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R102 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R103 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R104Not usedNot used
Texas Instruments, Digital Audio & Video
TI
TAS5026REF Parts List
Ref DesPart Number DescriptionHousingManufacturerManufacturer Part Number
R105 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R106 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R107 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R108 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R109 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R120 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R121 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R160 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R161 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R162 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R163 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R164 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R200 100210020 10 khm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R201 100210020 10 kohm 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R202 100222000 220 R 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 220R
R203 100247090 47 R0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 47R0
R204 100210080 1 R0 5% 300 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 1R0
R205 100247080 4 R70 5% 300 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 4R70
R206DeletedDeleted
R207DeletedDeleted
R208 100222090 22 R 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 22R
R209 100247080 4 R70 5% 300 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 4R70
R320 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R321 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R322 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R323 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R324 100210020 10 k0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R325 100210020 10 k0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R326 100210020 10 k0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R327 100210020 10 k0 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 10k0
R328 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R329 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R330 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R331 100282010 8 k20 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 -00 5% PA 8k20
R332 100210010 1 k00 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 1k00
R333 100210010 1 k00 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 1k00
R334 100210010 1 k00 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 1k00
R335 100210010 1 k00 5% 200 ppm 100 mW metalfilm 0603 BC Components DCT 0603 - 00 5% PA 1k00
Texas Instruments, Digital Audio & Video
Texas Instruments
TQFP64
Texas Instruments
TAS5026APFB
Texas Instruments
TSSOP14
Texas Instruments
TSSOP14
Texas Instruments
Texas Instruments
TPA112DGN
TI
TAS5026REF Parts List
Ref DesPart Number DescriptionHousingManufacturerManufacturer Part Number
SHUNT120 700110210 Black 2,54 mm shunt Molex 15-29-1024
SHUNT121 700110210 Black 2,54 mm shunt Molex 15-29-1024
U120520140083Dual AND gate, LVCMSOP8
U2005000502616 ch PWM processor (AD, VOL, 192kHz)
U300520140140Single Schmitt-Trigger Inverter, LVCSOT23-5
U301520140081Quad AND gate, LVC
U302 520141262 Quad buffer with output enable, LVC
U320 510101121 150-mW stereo power amplifier MSOP8