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參數(shù)資料
| 型號(hào)： | LM4917MT |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Ground-Referenced, 95mW Stereo Headphone Amplifier |
| 中文描述： | 0.095 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 1208K |
| 代理商： | LM4917MT |
Application Information
(Continued)
The value of R
f
is 30k
.
The last step in this design is setting the amplifier’s 3db
frequency bandwidth. To achieve the desired
±
0.25dB pass
band magnitude variation limit, the low frequency response
must extend to at lease onefifth the lower bandwidth limit
and the high frequency response must extend to at least five
times the upper bandwidth limit. The gain variation for both
response limits is 0.17dB, well within the
±
0.25dB desired
limit. The results are
f
L
= 100Hz / 5 = 20Hz
(8)
and
f
H
= 20kHz x 5 = 100kHz
(9)
As stated in the
External Components
section, both R
in
conjunction with C
i
, and R
L
, create first order highpass fil-
ters. Thus to obtain the desired low frequency response of
100Hz within
±
0.5dB, both poles must be taken into consid-
eration. The combination of two single order filters at the
same frequency forms a second order response. This results
in a signal which is down 0.34dB at five times away from the
single order filter 3dB point. Thus, a frequency of 20Hz is
used in the following equations to ensure that the response
is better than 0.5dB down at 100Hz.
C
i
≥
1 / (2
π
*20k
*20Hz) = 0.397μF; use 0.39μF (10)
The high frequency pole is determined by the product of the
desired high frequency pole, f
H
, and the closed-loop gain,
A
V
. With a closed-loop gain of 1.5 and f
H
= 100kHz, the
resulting GBWP = 150kHz which is much smaller than the
LM4917’s GBWP of 3MHz. This figure displays that if a
designer has a need to design an amplifier with a higher
gain, the LM4917 can still be used without running into
bandwidth limitations.
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4917MT/NOPB | 功能描述:音頻放大器 95mW St Headphone 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 |
| LM4917MTBD | 功能描述:BOARD EVALUATION LM4917MT RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| LM4917MTX | 功能描述:音頻放大器 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 |
| LM4917MTX/NOPB | 功能描述:音頻放大器 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 |
| LM4917SD | 功能描述:音頻放大器 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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