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參數(shù)資料
| 型號： | LM4840MTX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大?。?/td> | 829K |
| 代理商： | LM4840MTX/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) |
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