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参数资料
| 型号： | LMH6642MFXEP/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| 封装： | PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 10/21页 |
| 文件大小： | 966K |
| 代理商： | LMH6642MFXEP/NOPB |
Application Notes (Continued)
For this example, optimum C
f was empirically determined to
be around 5pF. This time domain response is shown in
Figure 4 below showing about 9ns rise/fall times, corre-
sponding to about 39MHz for f
p. The overall supply current
from the +5V supply is around 5mA with no load.
PRINTED CIRCUIT BOARD LAYOUT AND COMPONENT
VALUES SECTIONS
Generally, a good high frequency layout will keep power
supply and ground traces away from the inverting input and
output pins. Parasitic capacitances on these nodes to
ground will cause frequency response peaking and possible
circuit oscillations (see Application Note OA-15 for more
information). National Semiconductor suggests the following
evaluation boards as a guide for high frequency layout and
as an aid in device testing and characterization:
Device
Package
Evaluation
Board PN
LMH6642MF
SOT23-5
CLC730068
LMH6642MF
8-Pin SOIC
CLC730027
LMH6643MA
8-Pin SOIC
CLC730036
LMH6643MA
8-Pin MSOP
CLC730123
LMH6644MA
14-Pin SOIC
CLC730031
LMH6644MA
14-Pin TSSOP
CLC730131
These free evaluation boards are shipped when a device
sample request is placed with National Semiconductor.
Another important parameter in working with high speed/
high performance amplifiers, is the component values selec-
tion. Choosing external resistors that are large in value will
effect the closed loop behavior of the stage because of the
interaction of these resistors with parasitic capacitances.
These capacitors could be inherent to the device or a by-
product of the board layout and component placement. Ei-
ther way, keeping the resistor values lower, will diminish this
interaction to a large extent. On the other hand, choosing
very low value resistors could load down nodes and will
contribute to higher overall power dissipation.
20089465
FIGURE 4. Converter Step Response (1V
PP, 20 ns/DIV)
LMH6642EP/LMH6643EP/LMH6644EP
Enhanced
Plastic
www.national.com
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMH6642Q | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers |
| LMH6642QMF | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers |
| LMH6642QMF/NOPB | 功能描述:运算放大器 - 运放 Lo Pwr 130MHz 75mA R-R Output Amp 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 |
| LMH6642QMFX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers |
| LMH6642QMFX/NOPB | 功能描述:运算放大器 - 运放 Lo Pwr 130MHz 75mA R-R Output Amp 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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