- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄30754 > LM4870MX (NATIONAL SEMICONDUCTOR CORP) 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 PDF資料下載
參數(shù)資料
| 型號(hào)： | LM4870MX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 283K |
| 代理商： | LM4870MX |
Application Information (Continued)
ceeded momentarily, due to the discharging time constant of
the bias-pin voltage. This time constant is established by the
two 50k resistors (in parallel) with the series bypass capaci-
tor value.
When a set of headphones are plugged into the system, the
contact pin of the headphone jack is disconnected from the
signal pin, interrupting the voltage divider set up by resistors
R1 and R2. Resistor R1 then pulls up the HP-IN1 pin, en-
abling the headphone function and disabling the LM4870
amplifier. The headphone amplifier then drives the head-
phones, whose impedance is in parallel with resistor R2.
Since the typical impedance of headphones are 32
, resis-
tor R2 has negligible effect on the output drive capability.
Also shown in
Figure 3 are the electrical connections for the
headphone jack and plug. A 3-wire plug consists of a Tip,
Ring, and Sleave, where the Tip and Ring are signal carrying
conductors and the Sleave is the common ground return.
One control pin contact for each headphone jack is sufficient
to indicate to control inputs that the user has inserted a plug
into a jack and that another mode of operation is desired.
For a system implementation where the headphone amplifier
is designed using a split supply, the output coupling cap, C
C
and resistor R2 of
Figure 3, can be eliminated. The function-
ality described earlier remains the same, however.
In addition, the HP-SENSE pin, although it may be con-
nected to the SHUTDOWN pin as shown in
Figure 2, may
still be used as a control flag. It is capable of driving the input
to another logic gate or approximately 2 mA without serious
loading.
AUDIO POWER AMPLIFIER DESIGN
Design a 500 mW/8
Audio Amplifier
Given:
Power Output:
1.0Wrms
Load Impedance:
8
Input Level:
1 Vrms(max)
Input Impedance:
20 k
Bandwidth:
100 Hz-20 kHz ±0.25 dB
A designer must first determine the needed supply rail to ob-
tain the specified output power. The Output Power vs Supply
Voltage graphs in the Typical Performance Characteris-
tics section show how much power the LM4870 will output
given different supply voltage. According to the graph, 4.6V
DS100094-7
FIGURE 2. HP-SENSE Pin to
SHUTDOWN Pin Connection
DS100094-8
FIGURE 3. Typical Headphone Control Input Circuitry
LM4870
www.national.com
6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4871MDA | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4871MWA | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4871N/NOPB | 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDIP8 |
| LM4872IBPX/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| LM4872IBP/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 |
|---|---|
| LM4871 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3W Audio Power Amplifier with Shutdown Mode |
| LM4871_03 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:3W Audio Power Amplifier with Shutdown Mode |
| LM4871LD | 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 |
| LM4871LD/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 |
| LM4871LDX | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。