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Summary of Contents for Texas Instruments TPA0122
- Page 1 TPA0122 Audio Power Amplifier Evaluation Module User’s Guide June 1999 Mixed-Signal Products SLOU043...
- Page 2 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.
- Page 3 SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules. TPA0122 Stereo 2-W Audio Power Amplifier (literature number SLOS247) This is the data sheet for the TPA0122 audio amplifier integrated circuit. FCC Warning This equipment is intended for use in a laboratory test environment only.
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Page 5: Table Of Contents
..........Using The TPA0122 EVM With the Plug-N-Play Evaluation Platform . - Page 6 ......3-17 Tables 2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0122 ..2–2 Typical TPA0122 EVM Jumper Settings .
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Page 7: Introduction
Chapter 1 Introduction This chapter provides an overview of the Texas Instruments (TI ) TPA0122 audio amplifier evaluation module (SLOP206). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications. -
Page 8: Feature Highlights
Feature Highlights 1.1 Feature Highlights The TI TPA0122 audio amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features: TPA0122 Stereo 2-W Audio Power Amplifier Evaluation Module Internal depop circuitry to minimize transients in outputs Dual channel, bridge-tied load (BTL) or single-ended operation 2 W per channel output power into 3 Ω... -
Page 9: Description
The TPA0122 stereo 2-W audio power amplifier evaluation module is a complete, 2-watt per channel stereo audio power amplifier. It consists of the TI TPA0122 stereo 2-W audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2 ½... - Page 10 Introduction...
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Page 11: Quick Start
Chapter 2 Quick Start The steps in this chapter can be followed to quickly prepare the TPA0122 audio amplifier EVM for use. Using the TPA0122 with the TI plug-n-play audio amplifier evaluation platform is a quick and easy way to connect power, signal and control inputs, and signal outputs to the EVM using standard connectors. -
Page 12: Precautions
Precautions 2.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to V power input connector J1, J2, and/or V power input connector J6 are correct. Overvoltage or reverse-polarity power applied to these terminals can open onboard soldered-in fuses and cause other damage to the platform, installed evaluation modules, and/or the power source. -
Page 13: Quick Start List For Platform
1) Ensure that all external power sources are set to OFF and that the platform power switch S1 is set to OFF. 2) Install a TPA0122 module in platform socket U2, taking care to align the module pins correctly. 3) Use switch S2 to select or bypass the signal conditioning EVM (U1). -
Page 14: Module Preparation
LOUT– L HP SLOP206 LOUT+ TPA0122 EVM Board Table 2–4. Typical TPA0122 EVM Jumper Settings TPA0122 Note: ON = Shunt installed, OFF = Open 11) To allow the module SE/BTL control input to switch the amplifier IC between single ended (SE) and bridge-tied load (BTL) output modes, set output mode jumper S4 to OFF . -
Page 15: Quick Start List For Stand-Alone
Quick Start List for Stand-Alone 2.3 Quick Start List for Stand-Alone Follow these steps to use the TPA0122 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA0122 module header pins can be made via individual sockets, wire-wrapping, or soldering to the pins, either on the top or the bottom of the module circuit board. -
Page 16: Tpa0122 Evm Gain Settings
7) Use jumpers S2 and S3 to set the gain when the module is in the BTL output mode as shown in Table 2–6 (module gain is 1 in SE mode). Table 2–6. TPA0122 EVM Gain Settings OUTPUT MODE GAIN (V/V) Note: ON = Shunt installed, OFF = Open, X = Don’t care... -
Page 17: Details
Chapter 3 Details This chapter provides details on the TPA0122 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TPA0122 evaluation module. Topic Page Precautions .......... -
Page 18: Precautions
Precautions 3.1 Precautions Power Supply Input Polarity and Maximum Voltage Always ensure that the polarity and voltage of the external power connected to V power input connector J1, J2, and/or V power input connector J6 are correct. Overvoltage or reverse-polarity power applied to these terminals can open onboard soldered-in fuses and cause other damage to the platform, installed evaluation modules, and/or the power source. -
Page 19: Tpa0122 Evm
3.2 The TPA0122 Audio Power Amplifier Evaluation Module The TPA0122 audio power amplifier evaluation module is powered by a TPA0122 stereo power amplifier capable of delivering greater than 2 W of continuous power per channel into 3-Ω loads. The amplifier IC can be operated in either the BTL or single-ended output mode. -
Page 20: Tpa0122 Evm Schematic Diagram
0.47 µF 3.2.1 TPA0122 Audio Amplifier IC The TPA0122 audio amplifier IC (Figure 3–4) is a CMOS device intended primarily for bridge-tied load (BTL) operation in battery-powered applications. It is supplied in a very small 24-pin TSSOP thermal surface-mount package and has been designed to operate from low supply voltages (between approximately 4.5 V and 5.5 V). -
Page 21: Inputs And Gain
If using differential inputs, line and headphone inputs must be the same. A third input, PC BEEP, is common to both channels. The TPA0122 IC monitors this input when operating in both the active and shutdown modes and automatically switches to this input when a signal is sensed. In computer applications, for example, this allows the normal audio signal (music, sounds, etc.) to be interrupted when there is a need to output a computer beep. -
Page 22: Differential Input
The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel. To use the TPA0122 EVM with a differential source, connect the positive lead of the audio source to the R LINE–... -
Page 23: Depop Circuitry
TPA0122 IC to the single-ended mode. In the single-ended mode, the amplifiers inside the TPA0122 IC that drive the OUT– lines do not operate and do not dissipate any power. The OUT– pins go into a high-impedance state and can be left connected or allowed to float. -
Page 24: Using The Tpa0122 Evm With The Plug-N-Play Evaluation Platform
Using The TPA0122 EVM With the Plug-N-Play Evaluation Platform 3.3 Using The TPA0122 EVM With the Plug-N-Play Evaluation Platform The TPA0122 audio amplifier evaluation module was designed to be used with the TI plug-n-play audio amplifier evaluation platform. It simply plugs into socket U2. -
Page 25: Tpa0122 Evm Jumpers And Switches
3.3.2 TPA0122 Module Jumper Settings and Switches The TPA0122 EVM is equipped with a pushbutton SPST switch and three jumpers that act as SPST switches to allow module operation to be modified to suit various requirements. In the following discussion, setting a jumper to ON means that a shunt is installed across the two pins of the jumper. -
Page 26: Tpa0122 Amplifier Ic
Pushbutton switch S1 on the EVM allows the manual shutdown of the TPA0122 amplifier IC. 3.3.2.2 S2, S3 — Gain Select Jumpers Jumpers S2 and S3 select the gain of the TPA0122 amplifier IC line as shown in Table 3–2. Table 3–2. TPA0122 EVM Gain Settings... -
Page 27: Platform Signal Routing And Outputs
When S3 is set to the power amplifier position (U2 – U4), the headphone jack is connected to the TPA0122 power amplifier OUT+ output lines. When a plug is inserted into the jack, signals output through J10 are returned to platform ground, requiring single-ended power amplifier operation. -
Page 28: Mute/Mode And Polarity Control
Mute (Shutdown)/Mode The TPA0122 EVM is equipped with a shutdown control input pin. When this input is pulled to ground, the TPA0122 amplifier IC on the module enters the shutdown mode and dissipates very little power. While in the shutdown mode, the PC BEEP input is still active. - Page 29 JP6. When JP6 is set to Mute, use the following JP8 settings for the TPA0122: To shut down the TPA0122 amplifier module when a plug is inserted into the headphone jack, jumper JP8 to Lo (this is the typical setting).
- Page 30 J6 MUST NOT exceed the absolute maximum rating for the TPA0122 amplifier IC installed on the evaluation module (6 V) or damage to the IC may result. In no case should voltage of the incorrect polarity or in excess of 6.1 V be applied to...
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Page 31: Typical Headphone Plug
J10 to the output lines of either the headphone amplifier socket or the power amplifier sockets (Figure 3 –6). When the TPA0122 output signal is routed to J10 by S3, signals output via J10 are returned to platform ground when a plug is inserted (Figure 3 –8), requiring single-ended operation... -
Page 32: Tpa0122 Evm Connected For Stereo Btl Output
Using The TPA0122 EVM Stand-Alone 3.4 Using The TPA0122 EVM Stand-Alone Using the TPA0122 audio power amplifier evaluation module stand-alone is much the same as using it with the platform. The same 4.5-V to 5.5-V power supply range and the isolated OUT+ and OUT– lines for BTL operation requirement exists. -
Page 33: Tpa0122 Evm Connected For Stereo Single-Ended Output
33 µF – SHUTDOWN L IN+ 1000 µF L LINE– LOUT– Audio Input L HP SLOP206 LOUT+ (Left) TPA0122 EVM Board Table 3–4. Typical TPA0122 EVM Jumper Settings for Single-Ended Stand-Alone TPA0122 Note: ON = Shunt installed OFF = Open Details 3-17... -
Page 34: Tpa0122 Evm Parts List
TPA0122 Audio Power Amplifier Evaluation Module Parts List 3.5 TPA0122 Audio Power Amplifier Evaluation Module Parts List Table 3–5. Table 3–1. TPA0122 EVM Parts List Manufacturer/ Ref. Description Size Digi-Key Number Qty. Part Number Capacitor, 0.1 µF, 10%, C4, C5...
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