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参数资料
| 型号： | LM4868MTX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-20 |
| 文件页数： | 3/28页 |
| 文件大小： | 792K |
| 代理商： | LM4868MTX/NOPB |
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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
相关PDF资料 |
PDF描述 |
|---|---|
| LM4868LQ/NOPB | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24 |
| LM4868LQX/NOPB | 3 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC24 |
| LM4869MH/NOPB | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4869MHX/NOPB | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| LM4870MX | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4869 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4869MH | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown |
| LM4869MH/NOPB | 功能描述:IC AMP AUDIO PWR 2.6W AB 20TSSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4870 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1.1W Audio Power Amplifier with Shutdown Mode |
| LM4870M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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