Texas Instruments TPA3200D1 User manual

User's GuideSLOU173B – June 2005 – Revised July 2005
TPA3200D1 Audio Power Amplifier Evaluation Module
The TPA3200D1 evaluation module consists of a single 20-W digital input mono audiopower amplifier complete with a small number of external components mounted on acircuit board that can be used to directly drive a speaker with an external I
2
S audiosource as the input.
Contents1 Introduction .......................................................................................... 22 Operation ............................................................................................ 43 Schematic, PCB Layers and Parts List .......................................................... 94 TPA3200D1 EVM Parts List ..................................................................... 11
List of Figures
1 The TI TPA3200D1 Audio Power Amplifier EVM – Top View ................................ 22 The TI TPA3200D1 Audio Power Amplifier EVM – Bottom View ............................ 33 DEM-DAI/DAC Evaluation Platform .............................................................. 64 TPA3200D1 EVM Schematic ..................................................................... 95 TPA3200D1 EVM – Top Layer .................................................................. 106 TPA3200D1 EVM – Bottom Layer .............................................................. 10
List of Tables
1 TPA3200D1 EVM Specifications ................................................................. 32 Gain Settings ........................................................................................ 53 Digital Audio Receiver Data Format .............................................................. 74 Gain Settings ........................................................................................ 85 TPA3200D1 EVM Parts List ..................................................................... 11
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1 Introduction
Introduction
This section provides a top and bottom view of the EVM and the EVM board specifications.
Figure 1. The TI TPA3200D1 Audio Power Amplifier EVM – Top View
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Introduction
Figure 2. The TI TPA3200D1 Audio Power Amplifier EVM – Bottom View
Table 1. TPA3200D1 EVM Specifications
TPA3200D1
V
CC
8 V to 18 VSupply voltage rangeV
DD
4.5 V to 5.5 VI
CC
3 A maxSupply currentI
DD
40 mA maxContinuous output power per channel, PO: 8 Ω,
20 WV
CC
= 18 V, THD+N = 10%R
L
Minimum load impedance 4 Ω
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2 Operation
2.1 Quick Start List for Stand-Alone Operation
Operation
To use the TPA3200D1EVM stand-alone or when connecting it into existing circuits or equipment, followthese steps. Connections to the EVM module can be made by inserting stripped wire into the platedthrough holes on the J1, J2 headers and using banana plugs for the other connectors on the PCB.
2.1.1 Power Supply (Step 1)1. Ensure that all external power sources are set to OFF.2. Connect an additional external regulated power supply set to 5 V to the module VDD and GND pins onthe top side of the J2 header.
Note:
This supply should be turned ON before the VCC supply is turned ON.
3. Connect an external regulated power supply adjusted from 8 V–18 V to the module VCC ( J4) and GND(J3) banana jacks taking care to observe marked polarity.
2.1.2 Evaluation Module Preparations (Step 2)
Inputs and Outputs1. Ensure that all connections are made to the I
2
S inputs (SCLK, BCK, LRCK, DATA, and GND) on theJ1 header.
2. Connect a speaker across OUTP ( J8) and OUTN ( J7)3. Install both gain jumpers GAIN0 ( J5) and GAIN1 ( J6). This sets the gain of the amplifier to the lowestlevel, 12 dB.
Control Inputs1. SHUTDOWN: This terminal is active low. A low on the device terminal (< 0.8 V) shuts down theamplifier; a high (> 2 V) on the device terminal places the amplifier in the active state. Holding downswitch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier to theactive state.2. MUTE: This terminal is active high. A high on this terminal immediately terminates audio playbackthrough the speakers. However, the outputs are still active (they are switching). The outputs are notdisabled like the SHUTDOWN case. S3 on the EVM controls the state of the MUTE terminal. Switchingthe left side of S3 to 1 turns Mute on. Switching S3 to the 0 position turns Mute off.3. FORMAT: This terminal selects between two possible digital data input formats. S2 on the EVMcontrols the data format. Switching the right side of S2 to 0 selects the 16-24 bit, I
2
S format. Switchingthe right side of S2 to 1 selects the 16-bit right-justified format.4. LSEL/RSEL: A typical digital input data stream consists of 2 channels of data. However, this amplifieris a mono, bridged-tied amplifier. Therefore, it is necessary to select which channel of data is sent tothe mono output. This terminal is used to select between the 2 channels, typically left/right data.Switching the left side of S2 to the RSEL position selects right-channel data. Switching the left side ofS2 to the LSEL position selects left-channel data.5. DEMP: This terminal is used to enable/disable the internal 44.1-kHz de-emphasis filter. S3 on the EVMcontrols the functionality of this terminal. Switching the right side of S3 to the 0 position disables the44.1-kHz de-emphasis. Switching the right side of S3 to the 1 position enables the 44.1-kHzde-emphasis.
6. GAIN0/GAIN1: Together, these terminals control the back-end gain of the amplifier. Jumpers J5 andJ6 control these terminals. The position of these jumpers and resulting gain is shown in Table 2 .
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Operation
Table 2. Gain Settings
GAIN1 (J6)
(1)
GAIN0 (J5)
(1)
AMPLIFIER GAIN (dB)
ON ON 12ON OFF 18OFF ON 23.6OFF OFF Reserved
(1)
OFF = Jumper removed; ON = Jumper installed
Control Outputs1. ZERO: This pin is a TTL output for monitoring the state of the digital input. If the data for L-channeland R-channel remains at a 0 level for 1024 sampling periods (or LRCK clock periods), ZERO is set toa logic 1 state. If an input is present, the ZERO output is set to a logic 0. If desired, the output of thisterminal can be inverted with an external transistor and used to place the amplifier in a SHUTDOWNstate when no input is detected (see the operation of the SHUTDOWN terminal in the Control Inputsection). A test point, TP1, is provided to monitor this output.
Power Up1. Verify correct voltage and input polarity, and turn the external power supplies on. The supplies shouldbe sequenced such that the 5-V supply comes up first before the 8-V – 18-V supply is turned on.The EVM should begin operation.2. Adjust the control inputs to the desired settings.3. If no sound is audible, check the state of the MUTE ( S3) switch.4. If the sound is distorted, check the status of the FORMAT ( S2) switch to ensure that the formatselected matches the incoming digital data stream.5. Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.6. Switch between the left and right digital data by moving the left side of switch S2 between the twosettings.
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2.2 Quick Start List for DEM-DAI/DAC Platform Operation
INSTALL EVM
HERE
3
1
4
2
Operation
To use the TPA3200D1EVM with a DEM-DAI/DAC platform, follow these steps. The DEM-DAI/DACplatform consists of a 96-kHz digital audio receiver that accepts S/PDIF and optical inputs for directinterface to a digital audio source such as an audio precision or component CD/DVD player. This platformcan be used to evaluate the audio performance of the TPA3200D1EVM using a measurement systemsuch as the Audio Precision system. Figure 3 is referenced throughout this section. See theDEM-DAI1742 document (SBAU034 ) for detailed information on the operation of this board.
Figure 3. DEM-DAI/DAC Evaluation Platform
2.2.1 Evaluation Platform Preparations (Step 1)
Setup
1. Install the EVM into the DEM-DAI/DAC platform in the location at the center of the platform. Theheader labeled J1 should be attached to CN101 on the DEM platform. The header labeled J2 shouldbe attached to CN102 on the DEM platform. See Figure 3 for proper alignment.2. Connect a CD/DVD player or audio precision via a single RCA cable from the coaxial (digital) output toCN001 or use an optical cable to connect from the optical (digital) output to U001 on the DEMplatform. See Note 1 in Figure 3 .3. Set switches SW001–SW003 on the DEM platform according to Table 3 . Settings of this switch needto match the FORMAT selection on the TPA3200D1EVM. Other settings of SW001–SW003 are notsupported by the TPA3200D1EVM. See Note 2 in Figure 3 .
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Operation
Table 3. Digital Audio Receiver Data Format
SW001 SW002 SW003 Receiver Output Data Format
L H L 16-24 bit I
2
SH L H 16-bit Right Justified
4. Set switch SW005 to INT (CS8414). See Note 4 in Figure 3 .
Power Supply1. Ensure that all external power sources are set to off2. Connect a 5-V supply to CN054 and CN055 on the DEM-DAI/DAC platform. See Note 3 in theFigure 3 .CN054 should be connected to the positive and CN055 connected to the negative side of thesupply.
3. Connect an external regulated power supply adjusted from 8 V–18 V to the module VCC ( J4) and GND(J3) banana jacks taking care to observe marked polarity. Be careful when inserting the banana plugsto ensure that they are not inserted too far and short out vias on the DEM-DAI/DAC platform below.
2.2.2 Evaluation Module Preparations (Step 2)
Inputs and Outputs1. Ensure that a CD/DVD player or audio precision is connected via a single RCA cable from the coaxial(digital) output to CN001 or use an optical cable to connect from the optical (digital) output to U001 onthe DEM–DAI/DAC platform.2. Connect a speaker across OUTP ( J8) and OUTN ( J7) on the TPA3200D1EVM.3. Install both gain jumpers GAIN0 ( J5) and GAIN1 ( J6) on the TPA3200D1EVM. This sets the gain ofthe amplifier to the lowest level, 12 dB.
Control Inputs1. SHUTDOWN: This terminal is active low. A low on the device terminal (< 0.8 V) shuts down theamplifier; a high (> 2 V) on the device terminal places the amplifier in the active state. Holding downswitch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier to theactive state.2. MUTE: This terminal is active high. A high on this terminal immediately terminates audio playbackthrough the speakers. However, the outputs are still active (they are switching). The outputs are notdisabled like the SHUTDOWN case above. S3 on the EVM controls the state of the MUTE terminal.Switching the left side of S3 to 1 turns Mute on. Switching S3 to the 0 position turns Mute off.3. FORMAT: This terminal selects between two possible digital data input formats. S2 on the EVMcontrols the data format. Switching the right side of S2 to 0 selects the 16–24 bit, I
2
S format. Switchingthe right side of S2 to 1 selects the 16-bit right-justified format. Switches SW001–SW003 should be seton the DEM platform to match the settings on the EVM.4. LSEL/RSEL: A typical digital input data stream consists of 2 channels of data. However, this amplifieris a mono, bridged-tied amplifier. Therefore, it is necessary to select which channel of data is sent tothe mono output. This terminal is used to select between the 2 channels, typically left/right data.Switching the left side of S2 to the RSEL position selects right-channel data. Switching the left side ofS2 to the LSEL position selects left-channel data.5. DEMP: This terminal is used to enable/disable the internal 44.1-kHz de-emphasis filter. S3 on the EVMcontrols the functionality of this terminal. Switching the right side of S3 to the 0 position disables the44.1-kHz de-emphasis. Switching the right side of S3 to the 1 position enables the 44.1-kHzde-emphasis.
6. GAIN0/GAIN1: Together, these terminals control the back-end gain of the amplifier. Jumpers J5 andJ6 control these terminals. The position of these jumpers and resulting gain is shown in Table 4 .
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Operation
Table 4. Gain Settings
GAIN1 (J6)
(1)
GAIN0 (J5)
(1)
AMPLIFIER GAIN (dB)
ON ON 12ON OFF 18OFF ON 23.6OFF OFF Reserved
(1)
OFF = Jumper removed; ON = Jumper installed
Control Outputs1. ZERO: This pin is a TTL output for monitoring the state of the digital input. If the data for L-channeland R-channel remains at a 0 level for 1024 sampling periods (or LRCK clock periods), ZERO is set toa logic 1 state. If an input is present, the ZERO output is set to a logic 0. If desired, the output of thisterminal can be inverted with an external transistor and used to place the amplifier in a SHUTDOWNstate when no input is detected (see the operation of the SHUTDOWN terminal in the Control Inputsection). A test point, TP1, is provided to monitor this output.
Power Up1. Verify correct voltage and input polarity and turn the external power supplies on. The supplies shouldbe sequenced such that the 5-V supply comes up first before the 8-V – 18-V supply is turned on.The EVM should begin operation.2. Adjust the control inputs to the desired settings.3. If no sound is audible, check the state of the MUTE ( S3) switch.4. If the sound is distorted, check the status of the FORMAT ( S2) switch to ensure the format selectedmatches the incoming digital data stream selected by SW001–SW003 on the DEM-DAI/DAC platform.5. Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.6. Switch between the LEFT and RIGHT digital data by moving the left side of switch S2 between the twosettings.
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3 Schematic, PCB Layers and Parts List
3.1 TPA3200D1 EVM Schematic
LRCK
DGND
BCK
GAIN0
VCOM
DATA
FORMAT
SCLK
GAIN1
LR_SEL
VDD
NC
DGND
VDD
SHUTDOWN
PGND
PGND
VCLAMP
BSN
OUTN
OUTN
PGND
PVCC
NC
COSC
PGND
PGND
AGND
BSP
OUTP
OUTP
ROSC
PVCC
AGND
MUTE
DGND
DEMP
DGND
FLT1
ZERO
FLT2
VCC
VREF
BYPASS
0.1 Fm
10 Fm
220 pF
R2
J1-17
J1-19
J1-18
J1-5, 6,
J2-3, 4,
12, 13
16, 20
GND
J2-1, 2,
VDD
J3
J7
OUTN
J8
OUTP
GND
J4
VCC
S2-A
120 kW
120
kW
R3
R4
120 kW
J5
J6
S1
C14
C4
1 Fm
1 Fm
1 Fm
C5
C7
0.22 Fm0.22 Fm
22 Fm
R6
51 R
C10
C8
C13
D1 D2
1 nF
C12
1 nF
L2 L1
Ferrite Bead Ferrite Bead
R7
0W
C9
J4
VCC
R5
51 R
C6
R1 120 kW
C1
C3
1 Fm
1 Fm
C15
22 nF
TP1
C11
10 Fm
J1-15
J2-1, 2
VDD
S2-B
S3-A
S3-B
C2
Schematic, PCB Layers and Parts List
This section contains the EVM schematic, board layout, and bill of materials.
Figure 4. TPA3200D1 EVM Schematic
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3.2 TPA3200D1 EVM PCB Layers
Schematic, PCB Layers and Parts List
Figure 5. TPA3200D1 EVM – Top Layer
Figure 6. TPA3200D1 EVM – Bottom Layer
TPA3200D1 Audio Power Amplifier Evaluation Module10 SLOU173B – June 2005 – Revised July 2005