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参数资料
| 型号： | LM4874MH/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 16/21页 |
| 文件大小： | 869K |
| 代理商： | LM4874MH/NOPB |
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given
θJA is for an LM4874 packaged in an MXA20A with the exposed-DAP soldered to an exposed 2in2 area of 1oz printed circuit board copper. When
driving 4
loads from a 5V supply, the LM4874MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in2 area of 1oz PCB copper.
Note 8: Typicals are measured at 25C and represent the parametric norm.
Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10: Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis.
Note 11: Output power is measured at the amplifier’s package pins.
Note 12: When driving 3
or 4 loads and operating on a 5V supply, the LM4874MH must be mounted to a circuit board that has a minimum of 2in2 of exposed,
uninterrupted copper area connected to the MH package’s exposed DAP.
External Components Description
See Figure 1.
Components
Functional Description
1.
C
i
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
i, along with the
LM4874’s variable input resistance R
1 (See Table 1), creates a highpass filter with fC = 1/(2
πR
iCi). Both
inverting and noninverting inputs require a C
i. Refer to the Application Information section, SELECTING
EXTERNAL COMPONENTS, for an explanation of determining the value of C
i.
2.
C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
3.
C
B
The capacitor, C
B, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement
and selecting C
B’s value.
Typical Performance Characteristics
MH Specific Characteristics
THD vs Frequency
20046998
V
DD = 5V, RL =4
,P
OUT = 1000mW,
at (from top to bottom at 1kHz):
A
V = 21.6dB, AV = 15.6dB,
A
V = 10dB, AV = 6dB
20046997
V
DD = 5V, RL =8
,P
OUT = 400mW,
at (from top to bottom at 1kHz):
A
V = 21.6dB, AV = 15.6dB,
A
V = 10dB, AV = 6dB
LM4874
www.national.com
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4875 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch |
| LM4875M | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4875M/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4875MM | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LM4875MM/NOPB | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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