參數(shù)資料
型號(hào)： LM4868LQ/NOPB
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 音頻／視頻放大
英文描述： 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
封裝： EXPOSED PAD, PLASTIC, LLP-24
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 792K
代理商： LM4868LQ/NOPB
Typical Performance Characteristics (Continued)
Power Supply
Rejection Ratio
Open Loop
Frequency Response
20026721
20026722
Supply Current vs
Supply Voltage
20026723
External Components Description
( Refer to Figure 1. )
Components
Functional Description
1.
R
i
This is the inverting input resistance that sets the closed-loop gain in conjunction with R
f. This resistor also
forms a high pass filter with C
i at fc = 1/(2
πR
iCi).
2.
C
i
This is the input coupling capacitor. It blocks the DC voltage at the amplifier’s input terminals. It also
creates a highpass filter with R
i at fc = 1/(2
πR
iCi). Refer to the section, Selecting External Components,
for an explanation of how to determine the value of C
i.
3.
R
f
This is the feedback resistance. It sets the closed-loop gain in conjunction with R
i.
4.
C
s
This is the supply bypass capacitor. It provides power supply filtering. Refer to the Power Supply
Bypassing section for information concerning proper placement and selection of the supply bypass
capacitor.
5.
C
B
This is the bypass pin capacitor. It provides half-supply filtering. Refer to the section, Proper Selection of
External Components, for information concerning proper placement and selection of C
B.
Application Information
ELIMINATING OUTPUT COUPLING CAPACITORS
Typical single-supply audio amplifiers that can switch be-
tween
driving
bridge-tied-load
(BTL)
speakers
and
single-ended (SE) headphones use a coupling capacitor on
each SE output. This capacitor blocks the half-supply volt-
age to which the output amplifiers are typically biased and
couples the audio signal to the headphones. The signal
return to circuit ground is through the headphone jack’s
sleeve.
The LM4868 eliminates these coupling capacitors. Amp2A is
internally configured to apply V
DD/2 to a stereo headphone
jack’s sleeve. This voltage matches the quiescent voltage
present on the Amp1A and Amp1B outputs that drive the
LM4868
www.national.com
11
相關(guān)PDF資料
PDF描述
LM4868LQX/NOPB 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24
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LM4869MHX/NOPB 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20
LM4870MX 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16
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LM4868MT/NOPB 功能描述:IC AMP AUDIO PWR 3W AB 20TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> 線(xiàn)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(lèi)型:H 類(lèi) 輸出類(lèi)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(lèi)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)
LM4868MTE 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function
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LM4869 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
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