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Texas Instruments TPA6040A4EVM User guides
User's Guide
SLOU196 – April 2007
TPA6040A4 Audio Power Amplifier Evaluation Module
1
2
3
Contents
Introduction .......................................................................................... 1
Operation ............................................................................................ 3
Schematic and Bill of Materials ................................................................... 5
List of Figures
1
2
3
4
TI TPA6040A4 Audio Power Amplifier EVM – Top View ......................................
TPA6040A4 EVM Schematic .....................................................................
TPA6040A4 EVM – Top Side Layout ............................................................
TPA6040A4 EVM – Bottom Side Layout ........................................................
2
5
6
6
List of Tables
1
1
Introduction
1.1
Description
Gain Settings ........................................................................................ 4
The TPA6040A4 evaluation module consists of a single 2-W stereo speaker amplifier and 85-mW
DirectPath™ headphone amplifier complete with a small number of external components mounted on a
circuit board that can be used to drive speakers and headphones directly with external analog audio
sources as inputs. The TPA6040A4 also contains an LDO capable of outputting 4.75 V with a maximum
load of 120 mA.
DirectPath is a trademark of Texas Instruments.
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Introduction
J001
Figure 1. TI TPA6040A4 Audio Power Amplifier EVM – Top View
1.2
TPA6040A4 EVM Specifications
Supply voltage range, VDD
4.5 V to 5.5 V
Supply current, IDD
1 A, maximum
Speaker amplifier output power per channel, PO: 4Ω, VDD = 5V, THD+N=10%
Headphone output power per channel, PO: 32 Ω, VDD = 5V, THD+N=10%
2
List of Tables
2W
85 mW
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Operation
2
Operation
2.1
Quick Start List for Stand-Alone Operation
2.1.1
Speaker Amplifier
Follow these steps to use the TPA6040A4 EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM can be made by inserting stripped wire or using banana plugs for the
power supply and output connections. The inputs accept standard RCA plugs.
2.1.2
2.1.3
Power Supply
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted to 5 V to the module VDD (J13) and GND (J14)
banana jacks, taking care to observe marked polarity.
Evaluation Module Preparations
Inputs and Outputs
1. If connecting to a fully differential input or a grounded input (the shield of the RCA is GND), remove
jumpers J3 and J4 from the EVM. If connecting to a floating source like a portable CD, install jumpers
J3 and J4. After setting the J3 and J4 jumpers appropriately, connect the input source to either the
speaker inputs (J1 and J2) or the headphone inputs (J11 and J12) or both.
2. Connect a speaker across +LOUT (J15) and –LOUT (J16). Connect another speaker across +ROUT
(J17) and –ROUT (J18).
3. Install both gain jumpers GAIN0 (J5) and GAIN1 (J6). This sets the gain of the amplifier to the lowest
level, 6 dB.
4. Connect a set of headphones to the headphone output jack (J10).
Control Inputs
1. Speaker Enable: This terminal is active-low. A LOW on the device terminal (<0.8 V) enables the
amplifier; a HIGH (>2 V) on the device terminal places the amplifier in the SHUTDOWN state. Holding
down switch S1 places the amplifier in the SHUTDOWN state. Releasing S1 returns the amplifier to
the active state.
2. Headphone Enable: This terminal is active-high. A LOW on the device terminal (<0.8 V) shuts down
the headphone amplifier; a HIGH (>2 V) on the device terminal places the headphone amplifier in the
active state. Holding down switch S2 places the headphone amplifier in the SHUTDOWN state.
Releasing S2 returns the headphone amplifier to the active state.
3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. See Table 1. Installing a
jumper in J5 or J6 sets the respective terminal to GND. Removing the jumper sets the respective
terminals to VDD. Removing jumpers INCREASES the gain while installing jumpers DECREASES the
gain. Logic levels are TTL-compatible.
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List of Tables
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Operation
Table 1. Gain Settings
GAIN0 (J5) (1)
(1)
2.1.4
1.
2.
3.
4.
4
GAIN1 (J6) (1)
Amplifier Gain (dB)
ON
ON
6
ON
OFF
10
OFF
ON
15.6
OFF
OFF
21.6
OFF = Jumper REMOVED; ON = Jumper INSTALLED
Power Up
Verify correct voltage and input polarity and turn the external power supplies ON.
The EVM should begin operation.
Adjust the input signal.
Adjust the control inputs to the desired settings.
Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.
List of Tables
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Schematic and Bill of Materials
Schematic and Bill of Materials
3.1
TPA6040A4 EVM Schematic
S001
3
Figure 2. TPA6040A4 EVM Schematic
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List of Tables
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Schematic and Bill of Materials
3.2
TPA6040A4 EVM PCB Layers
K001
Figure 3. TPA6040A4 EVM – Top Side Layout
K002
Figure 4. TPA6040A4 EVM – Bottom Side Layout
6
List of Tables
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Schematic and Bill of Materials
3.3
TPA6040A4 EVM Bill of Materials
REF.
DESCRIPTION
C1–C4
Capacitor, ceramic, 0.47-µF, ±10%, X5R,
10-V
PART NO.
VENDOR NO.
0603
4
TDK
C1608X5R1A474K
Digi-Key/445-1320-2-ND
C5–C12
Capacitor, ceramic, 1-µF, ±10%, X5R,
10-V
0603
8
TDK
C1608X5R1A105KT
Digi-Key/445-1321-2
C13
Capacitor, ceramic, 0.1-µF, ±10%, X7R,
50-V
0603
1
TDK
C1608X7R1H104KT Digi-Key/445-1314-2
C14
Capacitor, ceramic, 2.2-µF, 6.3 V, X5R,
20%
0603
1
TDK
C1608X5R0J225M
Digi-Key/445-1323-1-ND
C15–C17
Capacitor, ceramic, 10-µF, 6.3 V, Y5R,
20%
0805
3
TDK
C2012X5R0J106
Digi-Key/445-1363-1-ND
Resistor, chip, 100 kΩ, 1/10W, 5%
0603
5
Panasonic
ERJ-3GEYJ104V
Digi-Key/P100KG
4
Switchcraft
PJRAN1X1U03
Newark/16C1860
5
Norcomp
2163-36-01-P2
Digi-Key/2163S-36
Headphone jack
3
Kycon, Inc.
STX-3081-5N
Mouser/806-STX-3081-5t
J15–J18
Banana jack w/knurled thumbnut (nickel
plate)
6
Johnson
111-2223-001
Digi-Key/J587
J19, J20
2 pin 0.1 in. breakaway header
2
Sullins
PBX26SAAN
Digi-Key/PBC36SAAN
2
Panasonic
EVQ-PPBA25
Digi-Key/P8086S
1
TI
TPA6040A4
R1–R5
J1, J2, J11, J12
J3–J7
J10
SIZE
Phono jack, PC mount, switched
Header, 2 position, male
S1, S2
Switch, momentary, SMD, low profile
U1
TPA6040A4 2-W stereo audio power
amplifer
2 mm
0.1 in.
RTV
(S-PQFP-N32)
QTY
MFG
32-pin QFN 5-mm sq. and 0,5-mm spacing and exposed thermal pad
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List of Tables
7
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