- 您现在的位置：买卖IC网 > PDF目录32307 > LM6181IM/NOPB (NATIONAL SEMICONDUCTOR CORP) VIDEO AMPLIFIER, PDSO16 PDF资料下载
参数资料
| 型号： | LM6181IM/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | VIDEO AMPLIFIER, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 8/28页 |
| 文件大小： | 1928K |
| 代理商： | LM6181IM/NOPB |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
Typical Applications
CURRENT FEEDBACK TOPOLOGY
For a conventional voltage feedback amplifier the resulting
small-signal bandwidth is inversely proportional to the de-
sired gain to a first order approximation based on the
gain-bandwidth concept. In contrast, the current feedback
amplifier topology, such as the LM6181, transcends this limi-
tation to offer a signal bandwidth that is relatively indepen-
dent of the closed-loop gain.
Figure 1a and Figure 1b illus-
trate that for closed loop gains of 1 and 5 the resulting
pulse fidelity suggests quite similar bandwidths for both
configurations.
The closed-loop bandwidth of the LM6181 depends on the
feedback resistance, R
f. Therefore, RS and not Rf, must be
varied to adjust for the desired closed-loop gain as in
Figure
2.
POWER SUPPLY BYPASSING AND LAYOUT
CONSIDERATIONS
A fundamental requirement for high-speed amplifier design
is adequate bypassing of the power supply. It is critical to
maintain a wideband low-impedance to ground at the ampli-
fiers supply pins to insure the fidelity of high speed amplifier
transient signals. 10 F tantalum and 0.1 F ceramic bypass
capacitors are recommended for each supply pin. The by-
pass capacitors should be placed as close to the amplifier
pins as possible (0.5" or less).
FEEDBACK RESISTOR SELECTION: R
f
Selecting the feedback resistor, R
f, is a dominant factor in
compensating the LM6181. For general applications the
LM6181 will maintain specified performance with an 820
feedback resistor. Although this value will provide good re-
sults for most applications, it may be advantageous to adjust
this value slightly. Consider, for instance, the effect on pulse
responses with two different configurations where both the
closed-loop gains are 2 and the feedback resistors are 820
and 1640
, respectively. Figure 3a and Figure 3b illustrate
the effect of increasing R
f
while maintaining the same
closed-loop gain — the amplifier bandwidth decreases. Ac-
cordingly, larger feedback resistors can be used to slow
down the LM6181 (see 3 dB bandwidth vs R
ftypical curves)
and reduce overshoot in the time domain response. Con-
versely, smaller feedback resistance values than 820
can
be used to compensate for the reduction of bandwidth at
high closed loop gains, due to 2nd order effects. For ex-
ample
Figure 4 illustrates reducing R
f to 500 to establish
the desired small signal response in an amplifier configured
for a closed loop gain of 25.
DS011328-12
1a
DS011328-13
1b
FIGURE 1. 1a, 1b: Variation of Closed Loop Gain
from 1 to 5 Yields Similar Responses
DS011328-14
FIGURE 2. R
S Is Adjusted to Obtain
the Desired Closed Loop Gain, A
VCL
www.national.com
16
相关PDF资料 |
PDF描述 |
|---|---|
| LM8500HVA9/NOPB | SPECIALTY CONSUMER CIRCUIT, PQCC44 |
| LM8500IMT9/NOPB | SPECIALTY CONSUMER CIRCUIT, PDSO48 |
| LM8500HLQ9/NOPB | SPECIALTY CONSUMER CIRCUIT, QCC44 |
| LM8300HVA9/NOPB | SPECIALTY CONSUMER CIRCUIT, PQCC44 |
| LM8300IMT9/NOPB | SPECIALTY CONSUMER CIRCUIT, PDSO48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM6181IMX | 功能描述:IC AMP CURR FEEDBK 100MHZ 16SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:VIP™ II 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| LM6181IMX/NOPB | 制造商:Texas Instruments 功能描述:OP Amp Single Current Fdbk |
| LM6181IMX-8 | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LM6181IMX-8/NOPB | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| LM6181IN | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。