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參數(shù)資料
| 型號： | TPA2010D1YEF |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 2.5單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 415K |
| 代理商： | TPA2010D1YEF |
SLOS417A OCTOBER 2003 REVISED DECEMBER 2003
www.ti.com
10
Input Resistors (R
I
)
The input resistors (R
I
) set the gain of the amplifier according to equation (1).
Gain
2 x 150 k
RI
V
V
Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference
voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic
distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or
better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays
with 1% matching can be used with a tolerance greater than 1%.
Place the input resistors very close to the TPA2010D1 to limit noise injection on the high-impedance nodes.
For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the TPA2010D1 to operate
at its best, and keeps a high voltage at the input making the inputs less susceptible to noise.
Decoupling Capacitor (C
S
)
The TPA2010D1 is a high-performance class-D audio amplifier that requires adequate power supply decoupling
to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically
1
μ
F, placed as close as possible to the device V
DD
lead works best. Placing this decoupling capacitor close
to the TPA2010D1 is very important for the efficiency of the class-D amplifier, because any resistance or
inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering
lower-frequency noise signals, a 10
μ
F or greater capacitor placed near the audio power amplifier would also
help, but it is not required in most applications because of the high PSRR of this device.
Input Capacitors (C
I
)
The TPA2010D1 does not require input coupling capacitors if the design uses a differential source that is biased
from 0.5 V to V
DD
– 0.8 V (shown in Figure 27). If the input signal is not biased within the recommended
commonmode input range, if needing to use the input as a high pass filter (shown in Figure 28), or if using
a single-ended source (shown in Figure 29), input coupling capacitors are required.
The input capacitors
and input resistors form a high-pass filter with the corner frequency, f
c
, determined in
equation (2).
fc
1
2 RICI
The value of the input capacitor
is important to consider as it directly affects the bass (low frequency)
performance of the circuit. Speakers in wireless phones cannot usually respond well to low frequencies, so the
corner frequency can be set to block low frequencies in this application.
Equation (3) is reconfigured to solve for the input coupling capacitance.
CI
1
2 RIfc
If the corner frequency is within the audio band, the capacitors should have a tolerance of
±
10% or better,
because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below.
For a flat low-frequency response, use large input coupling capacitors (1
μ
F). However, in a GSM phone the
ground signal is fluctuating at 217 Hz, but the signal from the codec does not have the same 217 Hz fluctuation.
The difference between the two signals is amplified, sent to the speaker, and heard as a 217 Hz hum.
(1)
(2)
(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2010D1YEFR | 功能描述:音頻放大器 Mono Filter-Free Class-D in WCSP 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2010D1YEFT | 功能描述:音頻放大器 Mono Filter-Free Class-D in WCSP 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2010D1YZF | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.5-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| TPA2010D1YZFR | 功能描述:音頻放大器 Mono Filter-Free Class-D in WCSP 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA2010D1YZFRG4 | 制造商:TI 功能描述:AUDIO POWER AMPLIFIER |
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