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| 型號： | SA58670ABS |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 音頻放大器 |
| 英文描述： | 2.1 W-channel stereo class-D audio amplifier |
| 封裝： | SA58670ABS<SOT917-1 (HVQFN20)|<<http://www.nxp.com/packages/SOT917-1.html<1<Always Pb-free,; |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SA58670ABS |
SA58670A_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 23 October 2008
17 of 24
NXP Semiconductors
SA58670A
2.1 W/channel stereo class-D audio amplier
Since the value of the input decoupling capacitor and the input resistance determined by
the gain setting affects the low frequency performance of the audio amplier, it is
important to consider this during the system design. Small speakers in wireless and
cellular phones usually do not respond well to low frequency signals, so the 3 dB cut-off
frequency may be increased to block the low frequency signals to the speakers. Not using
input coupling capacitors may increase the output offset voltage.
(2)
11.3 PCB layout considerations
Component location is very important for performance of the SA58670A. Place all
external components very close to the SA58670A. Placing decoupling capacitors directly
at the power supply voltage pins increases efciency because the resistance and
inductance in the trace between the SA58670A power supply voltage pins and the
decoupling capacitor causes a loss in power efciency.
The trace width and routing are also very important for power output and noise
considerations.
For high current pins (PVDD, PGND and audio output), the trace widths should be
maximized to ensure proper performance and output power. Use at least 500
m wide
traces.
For the input pins (INRP, INRN, INLP and INLN), the traces must be symmetrical and run
side-by-side to maximize common-mode cancellation.
11.4 Filter-free operation and ferrite bead lters
A ferrite bead low-pass lter can be used to reduce radio frequency emissions in
applications that have circuits sensitive to frequencies greater than 1 MHz. A ferrite bead
low-pass lter functions well for ampliers that must pass FCC unintentional radiation
requirements for frequencies greater than 30 MHz. Choose a bead with high-impedance
at high frequencies and very low-impedance at low frequencies. In order to prevent
distortion of the output signal, select a ferrite bead with adequate current rating.
For applications in which there are circuits that are EMI sensitive to low frequencies
(< 1 MHz) and there are long leads from amplier to speaker, it is necessary to use an LC
output lter.
Table 6.
Gain selection
G1
G0
Gain (V/V)
Gain (dB)
Input impedance (k
)
LOW
2
6
28.1
LOW
HIGH
4
12
17.3
HIGH
LOW
8
18
9.8
HIGH
16
24
5.2
C
i
1
2
π R
i
×
f
3dB
–
×
--------------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA58670ABS,115 | 功能描述:音頻放大器 2.1W/CH CLASS D 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 |
| SA58670ABS115 | 制造商:NXP Semiconductors 功能描述:IC AUDIO AMP D 2.1W QFN-20 |
| SA58670ABS-G | 功能描述:音頻放大器 2.1W/CH CLASS D AUDIO 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 |
| SA58670BS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.1 W/channel stereo class-D audio amplifier |
| SA58670BS,115 | 功能描述:音頻放大器 2.1W/CH CLASS D 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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