LT1713IMS8 데이터 시트보기 (PDF) - Linear Technology

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LT1713IMS8

Single/Dual, 7ns, Low Power, 3V/5V/±5V Rail-to-Rail Comparators

Linear Technology 

LT1713/LT1714

APPLICATIO S I FOR ATIO

Poor trace routes and high source impedances are also

common sources of problems. Keep trace lengths as

short as possible and avoid running any output trace

adjacent to an input trace to prevent unnecessary cou-

pling. If output traces are longer than a few inches,

provide proper termination impedances (typically 100Ω

to 400Ω) to eliminate any reflections that may occur. Also

keep source impedances as low as possible, preferably

much less than 1kΩ.

The input and output traces should also be isolated from

one another. Power supply traces can be used to achieve

this isolation as shown in Figure 1, a typical topside layout

of the LT1713/LT1714 on a multilayer PC board. Shown is

the topside metal etch including traces, pin escape vias and

the land pads for a GN16 LT1713/LT1714 and its adjacent

X7R 0805 bypass capacitors. The V+, V– and GND traces

all shield the inputs from the outputs. Although the two V–

pins are connected internally, they should be shorted to-

gether externally as well in order for both to function as

shields. The same is true for the two V+ pins. The two GND

pins are not connected internally, but in most applications

they are both connected directly to the ground plane.

1714 F01

Figure 1. Typical LT1714 Topside Metal for Multilayer PCB Layout

9

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