LT1461CCS8-3 datasheet(11/16 Pages) LINER

Part #	LT1461CCS8-3

Description	Micropower Precision Low Dropout Series Voltage Reference Family

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Manufacturer	LINER [Linear Technology]

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11

LT1461

The most effective technique to improve PC board stress

is to cut slots in the board around the reference to serve as

a strain relief. These slots can be cut on three sides of the

reference and the leads can exit on the fourth side. This

“tongue” of PC board material can be oriented in the long

direction of the board to further reduce stress transferred

to the reference.

The results of slotting the PC boards of Figures 5a and

5b are shown in Figures 6a and 6b. In this example the

slots can improve the output shift from about 100ppm to

nearly zero.

relative output deviation is noted. The result shown in

Figure 5a is for two LT1461S8-2.5s mounted vertically and

Figure 5b is for two LT1461S8-2.5s mounted horizontally.

The parts oriented in Figure 5a impart less stress into the

package because stress is absorbed in the leads. Figures

5a and 5b show the deviation to be between 125

µV and

250

µV and implies a 50ppm and 100ppm change respec-

tively. This corresponds to a 13- to 14-bit system and is

not a problem for most 10- to 12-bit systems unless the

system has a calibration. In this case, as with temperature

hysteresis, this low level can be important and even more

careful techniques are required.

SLOT

2

1

0

40

30

20

FLEXURE NUMBER

10

1461 F06a

–1

Figure 6a. Same Two LT1461S8-2.5s in Figure 5a, but with Slots

SLOT

2

1

0

40

30

20

FLEXURE NUMBER

10

1461 F06b

–1

Figure 6b. Same Two LT1461S8-2.5s in Figure 5b, but with Slots

LONG DIMENSION

2

1

0

40

30

20

FLEXURE NUMBER

10

1461 F05a

–1

Figure 5a. Two Typical LT1461S8-2.5s,

Vertical Orientation Without Slots

FLEXURE NUMBER

1461 F05b

LONG DIMENSION

2

1

0

40

30

20

10

–1

Figure 5b. Two Typical LT1461S8-2.5s,

Horizontal Orientation Without Slots

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LT1461CCS8-3 Datasheet(PDF) 11 Page - Linear Technology

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