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Texas Instruments TAS5132DDV2EVM Application notes
Application Report
SLLA258 – April 2007
TAS5132DDV2EVM
Fred Shipley ........................................................................................ Digital Audio and Video Products
ABSTRACT
The TAS5132V2EVM PurePath Digital™ customer evaluation module (EVM)
demonstrates the integrated circuits TAS5086PAG and TAS5132DDV from Texas
Instruments (TI). This application report covers the EVM specifications, audio
performance and power efficiency measurements graphs, and design documentation
that includes schematics, parts list, layout, and mechanical design.
1
2
3
4
Contents
Introduction .......................................................................................... 2
TAS5132V2EVM Specification.................................................................... 3
Component Notes .................................................................................. 9
References ......................................................................................... 10
List of Figures
1
2
3
4
5
6
7
8
9
10
11
TAS5132DDV2EVM Evaluation Module .........................................................
THD+N vs Power (BTL – 6Ω) .....................................................................
THD+N vs Power (BTL – 8Ω) .....................................................................
THD+N vs Frequency (BTL – 8Ω) ................................................................
FFT Spectrum With –60 dBFS Tone (BTL) .....................................................
Idle Noise FFT Spectrum (BTL) ..................................................................
Channel Separation ................................................................................
Frequency Response (BTL) .......................................................................
High-Current Protection (BTL) ....................................................................
Pop/Click (BTL) .....................................................................................
Output Stage Efficiency ............................................................................
2
4
5
5
6
6
7
7
8
8
9
List of Tables
1
2
3
4
5
6
General Test Conditions ...........................................................................
TAS5086 Register Settings .......................................................................
Electrical Data .......................................................................................
Audio Performance .................................................................................
Thermal Specification ..............................................................................
Physical Specifications.............................................................................
3
3
3
3
4
4
PurePath Digital, Equibit are trademarks of Texas Instruments.
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Introduction
1
Introduction
The TAS5132V2EVM PurePath Digital™ customer evaluation module (EVM) demonstrates the integrated
circuits TAS5086PAG and TAS5132DDV from Texas Instruments (TI).
TAS5086DBT is a high-performance, 32-bit (24-bit input) multichannel PurePath Digital™ pulse width
modulator (PWM) based on Equibit™ technology with fully symmetrical AD modulation scheme. The
device also has digital audio processing (DAP) that provides 48-bit signal processing, advanced
performance, and a high level of system integration.
The TAS5132DDV is a high-performance, integrated stereo Digital Amplifier Power Stage designed to
drive 8-Ω speakers at up to 20 W per channel. Incorporating TI’s Equibit™ technology, the device is
designed to be used with TI’s Equibit™ modulators. This system requires only a simple passive
demodulation filter to deliver high-quality, high-efficiency audio amplification. This EVM is configured with
two BTL channels.
This EVM is a complete 2-channel digital audio amplifier system which includes digital input (S/PDIF),
interface to PC and DAP features like digital volume control, input and output multiplexers, and bass
management. The EVM is designed to demonstrate the functionality of the TAS5132DDV in a minimum
component size/count scenario. Therefore, the TAS5132DDV is capable of better performance than this
EVM demonstrates; however, increased performance comes at increased price.
This 2.0 system is designed for applications such as television and plasma display panels (PDP).
Figure 1. TAS5132DDV2EVM Evaluation Module
For EVM setup and use, see TAS5132V2EVM User’s Guide (SLLU097).
The following sections of this document cover EVM specifications, audio performance and power
efficiency measurements graphs, and design documentation that includes schematics, parts list, layout,
and mechanical design.
2
TAS5132DDV2EVM
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TAS5132V2EVM Specification
2
TAS5132V2EVM Specification
Table 1. General Test Conditions
General Test Conditions
Notes
Output stage supply voltage:
System supply voltage:
18 V Laboratory power supply (Agilent 6574A)
Derived from Output Stage Supply; GVDD = 12 V
6-8 Ω
Load impedance :
Sampling frequency
48 kHz
PWM processor
TAS5086DBT
Output stage
TAS5132DDV PG1.1
TI input-USB board
HPLMC012 Rev 1
EVM configuration file
Version 1.00 TAS5132EVM.cfg
Table 2. TAS5086 Register Settings (1)
Register
Register
Value Notes
Modulation index limit register
0x10
Master volume register
0x07
0x30 Master volume set to 0 dB
Clock control register
0x00
0x6D 48-kHz sample rate; 256 FS MCLK frequency
OSC_TRIM register
0x1B
0x03 Select field trim
PWM start register
0x18
0x3F Start channels as part of system start
Split cap charge period register
0x1A
0x00 Split-capacitor charge time = 0 ms
System control register 2
0x05
0x20 All channels started; VALID1 = VALID2
(1)
0x04 Set modulation index set to 96.1%
These register settings are used for all test, unless otherwise specified.
Table 3. Electrical Data
Electrical Data
Notes/Conditions
Output power, BTL, 6 Ω:
18 W 1 kHz, unclipped (0 dBFS), TA = 25°C
Output power, BTL, 6 Ω:
25 W 1 kHz, 10% THD+N, TA = 25°C
Output power, BTL, 8 Ω:
15 W 1 kHz, unclipped (0 dBFS), TA = 25°C
Output power, BTL, 8 Ω:
21 W 1 kHz, 10% THD+N, TA = 25°C
Rated load impedance, BTL:
6-8 Ω
Rated load impedance, PBTL:
3-8 Ω
>5 A 1-kHz burst, 3 Ω, ROC = 22k
Maximum peak current, BTL:
>90 % 2x20 W, 8 Ω
Output stage efficiency:
System supply current:
<110 mA 1 kHz, –60-dBFS signal, with TI input board
H-Bridge supply current:
<33 mA 1 kHz, no signal, 10-µH output inductors
Table 4. Audio Performance
Audio Performance
Notes/Conditions
THD+N, BTL, 6 Ω:
1W
< 0.05% 1 kHz
THD+N, BTL, 6 Ω:
10 W
< 0.06% 1 kHz
THD+N, BTL, 6 Ω:
20 W
< 0.1% 1 kHz
THD+N, BTL, 8 Ω:
1W
< 0.05% 1 kHz
THD+N, BTL, 8 Ω:
10 W
< 0.05% 1 kHz
THD+N, BTL, 8 Ω:
15 W
< 0.09% 1 kHz
Dynamic range:
Noise voltage:
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> 108 dB Reference: rated power, A-weighted, AES17 filter
< 35 µVrms A-weighted, AES17 filter
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TAS5132V2EVM Specification
Table 4. Audio Performance (continued)
Audio Performance
Notes/Conditions
Click/pop, BTL:
< 20 mV Mute/unmute, no input signal, 8 Ω
Channel separation
> 60 dB 1 kHz, POUT = 20 W
± 2 dB 15 W/ 8 Ω, unclipped (0 dBFS)
Frequency response:
Table 5. Thermal Specification
TPCB (1) Notes/Conditions
Thermal Specification
Idle, all channels switching
<30°C 1 kHz, 15 minutes, –60-dBFS signal, TA = 25°C
2 x 1.875 W, 8 Ω, (1/8 power)
<35°C 1 kHz, 1 hour, TA = 25°C
2 x 15 W, 8 Ω , (full power)
<50°C 1 kHz, 5 minutes, TA = 25°C
(1)
Measured on component side of PCB, under the heat sink.
Table 6. Physical Specifications
Physical Specifications
Notes/Conditions
PCB dimensions (in mm)
200 × 100 × 25 HPLMC012-TAS5132EVMV2 total dimension
TAS5132V2EVM Amplifier Module
100 x 100 × 25
HPL-MC012 Modulator/Controller
Module
Total weight
Width × length × height (mm) (power stage section = 27 mm × 50
mm)
<1 kg Components + PCB + heat sink + mechanics
THD+N - Total Harmonic Distortion + Noise - %
10
BTL - 6 W
5
2
1
0.5
0.2
0.1
Right Channel - 6R
0.05
Left Channel - 6R
0.01
0.006
100m
Comments:
200m
500m
1
2
Power - W
5
10
Power supply: 18 Vdc
Load: 6 Ω
Input signal: 1 kHz
+2.5-dB gain in TAS5086
One trace for each channel, one channel loaded, the other muted
20
40
Filter: AES17
Sample frequency: 48 kHz
Figure 2. THD+N vs Power (BTL – 6Ω)
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THD+N - Total Harmonic Distortion + Noise - %
10
BTL - 8 W
5
2
1
0.5
0.2
0.1
Right Channel - 6R
0.05
0.02
Left Channel - 6R
0.01
0.006
100m
200m
500m
1
2
Power - W
5
10
20
Power supply: 18 Vdc
Load: 8 Ω
Input signal: 1 kHz
+2.5-dB gain in TAS5086
One trace for each channel, one channel loaded, the other muted
Comments:
40
Filter: AES17
Sample frequency: 48 kHz
Figure 3. THD+N vs Power (BTL – 8Ω)
THD+N - Total Harmonic Distortion + Noise - %
10
5
BTL - 8 W
2
1
0.5
10 W
0.2
0.1
0.05
0.02
1W
19 W
0.01
0.006
20
Comments:
50
100
200
500
1k
f - Frequency - Hz
Blue: 1 W
Green: 10 W
Power supply: 18 Vdc
Load: 8 Ω
Note: THD+N at high frequencies depend on the output-filter coil material.
2k
5k
Red: 19 W
Filter AES17
10k
20k
Sample frequency: 48 kHz
Figure 4. THD+N vs Frequency (BTL – 8Ω)
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TAS5132V2EVM Specification
0
-10
-20
-30
FFT - Spectrum - dBr
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
f - Frequency - Hz
Comments:
Load: 8 Ω
Sample frequency: 48 kHz
Power supply: 18 Vdc
Input signal: 1 kHz
Filter: AES17
FFT size: 16k
Reference: 0 dBFS
Figure 5. FFT Spectrum With –60 dBFS Tone (BTL)
0
-10
BTL
-20
Idle Noise Spectrum - dBr
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
10k
Comments:
Power supply: 18 Vdc
Input signal: Mute
20k
30k
40k
50k
f - Frequency - Hz
Load: 8 Ω
Sample frequency: 48 kHz
60k
70k
80k
FFT size: 16k
Auto mute disabled – none
Reference: 0 dBFS
Figure 6. Idle Noise FFT Spectrum (BTL)
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0
Left Channel 0
-10
-20
Channel Separation - dBr
-30
-40
-50
-60
-70
Right Channel 1
-80
-90
-100
-110
-120
-130
-140
-150
-160
20
Comments:
50
100
200
Blue: Right Channel 1
Input channel 1: 0 dBFS
500
1k
f - Frequency - Hz
Left Channel: 0 dB
Load: 6 Ω
Filter AES17
2k
5k
10k
20k
Reference: 0 dBFS
Sample frequency: 48 kHz
Power supply: 18 Vdc
Frequency Response - dBr
Figure 7. Channel Separation
Comments:
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
-0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
-4
-4.5
-5
-5.5
-6
20
BTL
8W
6W
50
100
200
Green: 6 Ω
Sample frequency: 48 kHz
500
1k
2k
f - Frequency - Hz
5k
Red: 8 Ω
Filter: AES17
10k
20k
Power supply: 18 Vdc
Figure 8. Frequency Response (BTL)
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TAS5132V2EVM Specification
2W
Green: 6 Ω
Input signal: 1 kHz
Comments:
Sample frequency: 48 kHz
Power supply: 18 Vdc
Figure 9. High-Current Protection (BTL)
30
26
22
18
14
V - Voltage - mV
10
6
2
-2
-6
-10
-14
-18
-22
-26
-30
-200
-150
-100
-50
0
50
100
150
200
t - Time - ms
Comments:
Load: 8 Ω
Input signal: 1 kHz
Sample frequency: 48 kHz
Power supply: 18 Vdc
Figure 10. Pop/Click (BTL)
8
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Component Notes
100
8W
90
6W
80
Efficiency - %
70
60
50
40
30
20
10
0
0
Comments:
10
20
Stereo Power Output (BTL)
BTL Load: 6 Ω and 8 Ω
30
40
PO - Output Power - W
Sample frequency: 48 kHz
50
60
Power supply: 18 Vdc
Input signal: 1 kHz
Figure 11. Output Stage Efficiency
3
Component Notes
3.1
PVDD Capacitors
The PVDD capacitors, 220 µF at 25 V were chosen to reject power supply noise and keep crosstalk below
-60 dB from 20 Hz to 20 KHz. Good-quality, low-ESR capacitors should be selected to reduce the
possibility of excessive noise at the amplifier’s output and to keep crosstalk within the Dolby Specification
of –60 dB within the audio band. These capacitors can be increased, if necessary.
3.2
Output Filter Inductors
The inductors were selected to form part of the output LC demodulation filter. They have dc resistance
<50 mΩ and an inductance of 10 µH. This inductance can be increased to 16 µH to provide a lower
frequency cutoff for the demodulation filter. As long as the inductance remains stable for peak current
within the power band, the inductor should not present problems, as long as it provides adequate residual
inductance during an output error condition to protect the amplifier (short-circuit protection).
3.3
Output Filter Capacitors
Good-quality film capacitors should be used for the 0.47-µF capacitors used in the output demodulation
filter. They should have a voltage rating of not less than 2 times the PVDD supply voltage.
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References
4
References
1. System Design Considerations for True Digital Audio Power Amplifiers application report (SLAA117)
2. Digital Audio Measurements application report (SLAA114)
3. TAS5086: 6 Channel Digital Audio PWM Processor data sheet (SLES131)
4. TAS5132: Stereo Digital Amplifier Power Stage data sheet (SLES190)
5. PSRR for PurePath Digital Audio Amplifiers application report (SLEA049)
6. Power Rating in Audio Amplifier application report (SLEA047)
7. PurePath Digital AM Interference Avoidance application report (SLEA040)
8. Click & Pop Measurements Technique application report (SLEA044)
9. Power Supply Recommendations for DVD-Receivers application report (SLEA027)
10. TAS5132DDV2 User's Guide (SLLU097)
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