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器件3D模型￥ 18.444
LMH6643MM/NOPB 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
运算放大器
封装:
MSOP-8
描述:
Texas Instruments
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P4Hot
典型应用电路图在P22P23P24
原理图在P21
封装尺寸在P27P29P30
标记信息在P27P28
封装信息在P26P27P28P29P30
焊接温度在P5
技术参数、封装参数在P5P21P23
应用领域在P1P39
电气规格在P5P6P7P8P9P10P11P12P13P14P15P16
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LMH6643MM/NOPB数据手册
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LMH6642
,
LMH6643
,
LMH6644
www.ti.com
SNOS966Q –MAY 2001–REVISED SEPTEMBER 2014
11 Layout
11.1 Layout Guidelines
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, "Frequent Faux Pas in Applying Wideband Current
Feedback Amplifiers", SNOA367, for more information). Texas Instruments suggests the following evaluation
boards as a guide for high frequency layout and as an aid in device testing and characterization:
Table 1. Printed Circuit Board Layout And Component Values
DEVICE PACKAGE EVALUATION BOARD PN
LMH6642MF 5-Pin SOT-23 LMH730216
LMH6642MA 8-Pin SOIC LMH730227
LMH6643MA 8-Pin SOIC LMH730036
LMH6643MM 8-Pin VSSOP LMH730123
LMH6644MA 14-Pin SOIC LMH730231
LMH6644MT 14-Pin TSSOP LMH730131
Another important parameter in working with high speed/high performance amplifiers, is the component values
selection. 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. Either 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.
11.2 Layout Example
Figure 59. LMH6642/LMH6643/LMH6644 Layer 1 Figure 60. LMH6642/LMH6643/LMH6644 Layer 2
Copyright © 2001–2014, Texas Instruments Incorporated Submit Documentation Feedback 25
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