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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： | 9/28页 |
| 文件大小： | 1928K |
| 代理商： | LM6181IM/NOPB |
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Typical Applications (Continued)
SLEW RATE CONSIDERATIONS
The slew rate characteristics of current feedback amplifiers
are different than traditional voltage feedback amplifiers. In
voltage feedback amplifiers slew rate limiting or non-linear
amplifier behavior is dominated by the finite availability of the
1st stage tail current charging the compensation capacitor.
The slew rate of current feedback amplifiers, in contrast, is
not constant. Transient current at the inverting input deter-
mines slew rate for both inverting and non-inverting gains.
The non-inverting configuration slew rate is also determined
by input stage limitations. Accordingly, variations of slew
rates occur for different circuit topologies.
DRIVING CAPACITIVE LOADS
The LM6181 can drive significantly larger capacitive loads
than many current feedback amplifiers. Although the
LM6181 can directly drive as much as 100 pF without oscil-
lating, the resulting response will be a function of the feed-
back resistor value.
Figure 5 illustrates the small-signal
pulse response of the LM6181 while driving a 50 pF load.
Ringing persists for approximately 70 ns. To achieve pulse
responses with less ringing either the feedback resistor can
be increased (see typical curves Suggested R
f and Rs for
C
L), or resistive isolation can be used (10–51 typically
works well). Either technique, however, results in lowering
the system bandwidth.
Figure 6 illustrates the improvement obtained with using a
47
isolation resistor.
DS011328-15
3a: R
f = 820
DS011328-16
3b: R
f = 1640
FIGURE 3. Increasing Compensation
with Increasing R
f
DS011328-17
FIGURE 4. Reducing R
f for Large
Closed Loop Gains, R
f = 500
DS011328-18
5a
DS011328-19
5b
FIGURE 5. A
V = 1, LM6181 Can Directly
Drive 50 pF of Load Capacitance with 70 ns
of Ringing Resulting in Pulse Response
www.national.com
17
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PDF描述 |
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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 |
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