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参数资料
| 型号： | LM4840MH/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封装： | TSSOP-28 |
| 文件页数： | 5/22页 |
| 文件大小： | 829K |
| 代理商： | LM4840MH/NOPB |
Application Information (Continued)
case when a BTL is connected to the amplifier, the compara-
tor forces the LM4840 to maintain bridgedamplifier opera-
tion. When the HPSense pin is externally floated, such as
when headphones are connected to the jack shown in
Figure
2, and internal pullup forces V
DD on the internal compara-
tor’s HPSense inputs. This changes the comparator’s out-
put state and enables the headphone function: it turns off
Amp2B, switches Amp2A’s input signal from an audio signal
to the V
DD/2 voltage present on pin 14, and mutes the
bridge-connected loads. Amp1A and Amp1B drive the head-
phones.
Figure 2 also shows the suggested headphone jack electri-
cal connections. The jack is designed to mate with a
threewire plug. The plug’s tip and ring should each carry
one of the two stereo output signals, whereas the sleeve
provides the return to Amp2A. A headphone jack with one
control pin contact is sufficient to drive the HPSense pin
when connecting headphones.
A switch can replace the headphone jack contact pin. When
a switch shorts the HPSense pin to V
DD, bridgeconnected
speakers are muted and Amp1A and Amp2A drive a pair of
headphones. When a switch shorts the HPSense pin to
GND, the LM4840 operates in bridge mode. If headphone
drive is not needed, short the HPSense pin to the OUTB
pin.
DS200104-74
FIGURE 2. The ESDAxxxL provides additional ESD protection beyond the 8000V shown in the Absolute Maximum
Ratings for the AMP2A output
DS200104-75
FIGURE 3. Volume Control Timing Diagram
LM4840
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4840MT | 制造商:Texas Instruments 功能描述:AMP AUDIO STEREO 2W SMD TSSOP28 |
| LM4840MT/NOPB | 功能描述:IC AMP AUDIO PWR 2.2W AB 28TSSOP 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) |
| LM4841 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive |
| LM48410 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Low EMI, Filterless, 2.3W Stereo Class D Audio Power Amplifier with National 3D Enhancement |
| LM48410SQ | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 2-CH Stereo 2.3W Class-D 24-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:AMP, POWER, CLASS D, 2.3W, LLP-24 |
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