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参数资料
| 型号： | LM4898ITLX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封装： | MICRO SMD-9 |
| 文件页数： | 3/17页 |
| 文件大小： | 596K |
| 代理商： | LM4898ITLX/NOPB |
Typical Performance Characteristics
Non-LD Specific Characteristics (Continued)
CMRR vs Frequency
V
DD = 5V, RL =8
, 200mV
pp
CMRR vs Frequency
V
DD = 3V, RL =8
, 200mV
pp
200737E8
200737F0
PSRR vs Common Mode Voltage
V
DD =5V
PSRR vs Common Mode Voltage
V
DD = 3V, RL =8
, 217Hz, 200mV
pp
200737F2
200737F4
Application Information
DIFFERENTIAL AMPLIFIER EXPLANATION
The LM4898 is a fully differential audio amplifier that fea-
tures differential input and output stages. Internally this is
accomplished by two circuits: a differential amplifier and a
common mode feedback amplifier that adjusts the output
voltages so that the average value remains V
DD/2. When
setting the differential gain, the amplifier can be considered
to have two "halves". Each half uses an input and feedback
resistor (R
i1 and Rf1) to set its respective closed-loop gain
(see Figure 1). With R
i1=Ri2 and Rf1=Rf2, the gain is set
at -R
f/Ri for each half. This results in a differential gain of
A
VD =-Rf/Ri
(1)
It is extremely important to match the input resistors to each
other, as well as the feedback resistors to each other for best
amplifier performance. See the Proper Selection of External
Components section for more information. A differential am-
plifier works in a manner where the difference between the
two input signals is amplified. In most applications, this
would require input signals that are 180 out of phase with
each other. The LM4898 can be used, however, as a single
ended input amplifier while still retaining its fully differential
benefits. In fact, completely unrelated signals may be placed
on the input pins. The LM4898 simply amplifies the differ-
ence between them.
All of these applications, either single-ended or fully differ-
ential, provide what is known as a "bridged mode" output
(bridge-tied-load, BTL). This results in output signals at Vo1
and Vo2 that are 180 out of phase with respect to each
other. Bridged mode operation is different from the single-
ended amplifier configuration that connects the load be-
tween the amplifier output and ground. A bridged amplifier
design has distinct advantages over the single-ended con-
figuration: it provides differential drive to the load, thus dou-
bling maximum possible output swing for a specific supply
voltage. Four times the output power is possible compared
with a single-ended amplifier under the same conditions.
This increase in attainable output power assumes that the
LM4898
www.national.com
11
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| LM4912MM/NOPB | 0.145 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| LM581JH | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY3 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4898LD | 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 |
| LM4898LD/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 |
| LM4898LDBD | 功能描述:BOARD EVALUATION LM4898LD RoHS:否 类别:编程器，开发系统 >> 评估板 - 音频放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| LM4898LDX | 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 |
| LM4898LDX/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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