參數(shù)資料
型號(hào)： TPA3121D2PWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO24
封裝： PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 13/29頁(yè)
文件大?。?/td> 860K
代理商： TPA3121D2PWPG4
BASIC MEASUREMENT SYSTEM
SLOS537 – MAY 2008........................................................................................................................................................................................................ www.ti.com
This section focuses on methods that use the basic equipment listed below:
Audio analyzer or spectrum analyzer
Digital multi meter (DMM)
Oscilloscope
Twisted-pair wires
Signal generator
Power resistor(s)
Linear regulated power supply
Filter components
EVM or other complete audio circuit
Figure 34 shows the block diagrams of basic measurement systems for class-AB and class-D amplifiers. A sine
wave is normally used as the input signal because it consists of the fundamental frequency only (no other
harmonics are present). An analyzer is then connected to the audio power amplifier (APA) output to measure the
voltage output. The analyzer must be capable of measuring the entire audio bandwidth. A regulated dc power
supply is used to reduce the noise and distortion injected into the APA through the power pins. A System Two
audio measurement system (AP-II) by Audio Precision includes the signal generator and analyzer in one
package.
The generator output and amplifier input must be ac-coupled. However, the EVMs already have the ac-coupling
capacitors, IN), so no additional coupling is required. The generator output impedance should be low to avoid
attenuating the test signal, and is important because the input resistance of APAs is not high. Conversely, the
analyzer input impedance should be high. The output resistance, ROUT, of the APA is normally in the hundreds of
milliohms and can be ignored for all but the power-related calculations.
Figure 34(a) shows a class-AB amplifier system. It takes an analog signal input and produces an analog signal
output. This amplifier circuit can be directly connected to the AP-II or other analyzer input.
This is not true of the class-D amplifier system shown in Figure 34(b), which requires low-pass filters in most
cases in order to measure the audio output waveforms. This is because it takes an analog input signal and
converts it into a pulse-width modulated (PWM) output signal that is not accurately processed by some
analyzers.
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA3121D2
相關(guān)PDF資料
PDF描述
TPA3121D2PWPRG4 AUDIO AMPLIFIER, PDSO24
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TPA3121D2PWPR AUDIO AMPLIFIER, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3121D2PWPR 功能描述:音頻放大器 15W Stereo Class-D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA3121D2PWPRG4 功能描述:音頻放大器 15W Stereo Class-D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA3122D2 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3122D2EVM 功能描述:音頻 IC 開發(fā)工具 TPA3122D2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA3122D2N 功能描述:音頻放大器 15W STEREO CLASS-D AUDIO POWER AMP RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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