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參數(shù)資料
| 型號： | LM4840LQ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, QCC28 |
| 封裝： | LLP-28 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大小： | 829K |
| 代理商： | LM4840LQ/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
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4840MH | 制造商:Texas Instruments 功能描述:AMP AUDIO STEREO 2W SMD TSSOP28 |
| LM4840MH/NOPB | 功能描述:IC AMP AUDIO PWR 2.2W AB 28TSSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，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) |
| 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 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風，靜音，短路保護，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) |
| LM4841 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive |
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