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參數(shù)資料
| 型號(hào)： | LM4900LD/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.675 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | LLP-8 |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 843K |
| 代理商： | LM4900LD/NOPB |
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Application Information (Continued)
From Equation 5, the minimum A
VD is 1.55; use AVD =2.
Since the desired input impedance was 20 k
, and with a
A
VD of 2, a ratio of 1:1 of RF to Ri results in an allocation of
R
i =RF =20k
. The final design step is to address the
bandwidth requirements which must be stated as a pair of
3 dB frequency points. Five times away from a pole gives
0.17 dB down from passband response which is better than
the required ±0.25 dB specified.
f
L = 100Hz/5 = 20Hz
f
H = 20kHzx5= 100kHz
As stated in the External Components section, R
i in con-
junction with C
i create a highpass filter.
C
i
≥ 1/(2π*20 k*20 Hz) = 0.397F; use 0.39F
The high frequency pole is determined by the product of the
desired high frequency pole, f
H, and the differential gain,
A
VD. With a AVD = 2 and fH = 100kHz, the resulting GBWP =
100kHz which is much smaller than the LM4900 GBWP of
25MHz. This figure displays that if a designer has a need to
design an amplifier with a higher differential gain, the
LM4900 can still be used without running into bandwidth
problems.
20006474
FIGURE 2. Differential Amplifier Configuration for LM4900
LM4900
www.national.com
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|---|---|
| LM4900M | 制造商:Texas Instruments 功能描述:AMP AUDIO 265MW@3.3V SMD SOIC8 |
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| LM4900MM | 制造商:Texas Instruments 功能描述:AMP AUDIO CELLULAR SMD LLP-16 |
| LM4900MM/NOPB | 功能描述:IC AMP AUDIO PWR .675W AB 8MSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 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:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機(jī)，2-通道（立體聲） 在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點(diǎn):I²C，麥克風(fēng)，靜音，短路保護(hù)，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4900MMBD | 功能描述:BOARD EVALUATION LM4900MM 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:- |
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