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參數(shù)資料
| 型號： | LM4875MMX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻控制 |
| 英文描述： | 1 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO8 |
| 封裝： | 0.118 INCH, MSOP-8 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大小： | 664K |
| 代理商： | LM4875MMX/NOPB |
Application Information (Continued)
increases. There is a linear relationship between the size of
CB and the turn-on time. Shown below are some typical
turn-on times for various values of C
B:
C
B
T
ON
0.01F
3ms
0.1F
30ms
0.22F
65ms
0.47F
135ms
1.0F
280ms
In order eliminate ’clicks and pops’, all capacitors must be
discharged before turn-on. Rapidly switching V
DD may not
allow the capacitors to fully discharge, which may cause
’clicks and pops’. In a single-ended configuration, the output
coupling capacitor, C
OUT, is of particular concern. This ca-
pacitor discharges through an internal 20k
resistor. De-
pending on the size of C
OUT, the time constant can be
relatively large. To reduce transients in single-ended mode,
an external 1k
-5k resistor can be placed in parallel with
the internal 20k
resistor. The tradeoff for using this resistor
is increased quiescent current.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figure 4 through Figure 6 show the recommended two-layer
PC board layout that is optimized for the SO-8 packaged
LM4875 and associated external components.
Figure 7
through
Figure 9 show the recommended two-layer PC
board layout for the MSOP packaged LM4875. Both layouts
are designed for use with an external 5V supply, 8
speak-
ers, and 8
-32 headphones. The schematic for both
recommended PC board layouts is
Figure 1.
Both circuit boards are easy to use. Apply a 5V supply
voltage and ground to the board’s V
DD and GND pads,
respectively. Connect a speaker with an 8
minimum imped-
ance between the board’s -OUT and +OUT pads. For head-
phone use, the layout has provisions for a headphone jack,
J1. When a jack is connected as shown, inserting a head-
phone plug automatically switches off the external speaker.
DS101042-38
FIGURE 4. Recommended SO PC board layout:
component side silkscreen
LM4875
www.national.com
8
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4876MDC | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4876MWC | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4877IBPX/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| LM4877IBP/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| LM4878IBPX/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4875MX | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4875MX/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4876 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.1W Audio Power Amplifier with Logic Low Shutdown |
| LM4876_03 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.1W Audio Power Amplifier with Logic Low Shutdown |
| LM4876M | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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