LMH6624 datasheet(18/20 Pages) NSC

18 / 20 page

Application Section (Continued)

Symmetry between the positive and negative paths in the

layout of differential circuitry should be maintained to mini-

mize the imbalance of amplitude and phase of the differential

signal.

These free evaluation boards are shipped when a device

sample request is placed with National Semiconductor.

Component value selection is another important parameter

in working with high speed/high performance amplifiers.

Choosing external resistors that are large in value compared

to the value of other critical components will affect the closed

loop behavior of the stage because of the interaction of

these resistors with parasitic capacitances. These parasitic

capacitors could either be inherent to the device or be a

by-product of the board layout and component placement.

Moreover, a large resistor will also add more thermal noise to

the signal path. Either way, keeping the resistor values low

will diminish this interaction. On the other hand, choosing

very low value resistors could load down nodes and will

contribute to higher overall power dissipation and high dis-

tortion.

Device

Package

Evaluation Board Part

Number

LMH6624MF

SOT23–5

CLC730216

LMH6624MA

SOIC-8

CLC730227

LMH6626MA

SOIC-8

CLC730036

LMH6626MM

MSOP-8

CLC730123

LMH6624 Datasheet(PDF) 18 Page - National Semiconductor (TI)