LT1016IS8 datasheet(9/20 Pages) LINER

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LT1016

APPLICATIO S I FOR ATIO

In Figure 4 the LT1016’s supplies are bypassed, but it still

oscillates. In this case, the bypass units are either too far

from the device or are lossy capacitors.

Use capacitors

with good high frequency characteristics and mount them

as close as possible to the LT1016. An inch of wire

between the capacitor and the LT1016 can cause prob-

lems. If operation in the linear region is desired, the

LT1016 must be over a ground plate with good RF bypass

capacitors (

≥0.01

mF) having lead lengths less than 0.2

inches. Do not use sockets.

In Figure 5 the device is properly bypassed but a new

problem pops up. This photo shows both outputs of the

comparator. Trace A appears normal, but Trace B shows

an excursion of almost 8V—quite a trick for a device

running from a 5V supply. This is a commonly reported

Figure 4. LT1016 Response with Poor Bypassing

Figure 5. Improper Probe Compensation Causes

Seemingly Unexplainable Amplitude Error

Figure 6. Overcompensated or Slow Probes

Make Edges Look Too Slow

2V/DIV

100ns/DIV

1016 F04

TRACE A

2V/DIV

TRACE B

2V/DIV

10ns/DIV

1016 F05

1V/DIV

50ns/DIV

1016 F06

problem in high speed circuits and can be quite confusing.

It is not due to suspension of natural law, but is traceable

to a grossly miscompensated or improperly selected

oscilloscope probe.

Use probes that match your

oscilloscope’s input characteristics and compensate them

properly. Figure 6 shows another probe-induced problem.

Here, the amplitude seems correct but the 10ns response

time LT1016 appears to have 50ns edges! In this case, the

probe used is too heavily compensated or slow for the

oscilloscope. Never use 1

¥ or “straight” probes. Their

bandwidth is 20MHz or less and capacitive loading is high.

Check probe bandwidth to ensure it is adequate for

the measurement. Similarly, use an oscilloscope with

adequate bandwidth.

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