VRE4110K datasheet(5/7 Pages) ETC

Part #	VRE4110K

Description	Low Cost, SOIC-8 Precision References

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BASIC CIRCUIT CONNECTION

Figure 3 shows the proper connection of the

VRE4100 series voltage reference.

To achieve the specified performance, pay careful

attention

to

the

layout.

Commons

should

be

connected to a single point to minimize interconnect

resistances. This will reduce voltage errors, noise

pickup, and noise coupled from the power supply.

VRE4100DS REV. A MAY 01

Figure 2

External Connections

2

6

+ V

OUT

3

+ V

IN

VRE4100

NC

Enable

4

C

OUT 1µF

Reference output

Vout

6

This pin must be left open

NC

1,5,7,8

Pulled to V

in for normal

operation.

Enable

3

Positive power supply input

These must be connected to

ground

Vin

GND

2

4

PIN DESCRIPTION

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TEMPERATURE PERFORMANCE

The VRE4100 is designed for applications where

the initial error at room temperature and drift over

temperature are important to the user.

For many

instrument manufacturers, a voltage reference with

a temperature coefficient of 1ppm/°C makes it

possible

to

eliminate

a

system

temperature

calibration, a slow and costly process.

Of the three TC specification methods (slope,

butterfly, and box), the box method is most

commonly used. A box is formed by the min/max

limits for the nominal output voltage over the

operating temperature range. The equation follows:

This method corresponds more accurately to the

method of test and provides a closer estimate of

actual error than the other methods.

The box

method guarantees limits for the temperature error

but does not specify the exact shape or slope of the

device under test.

For example a designer who needs a 14-bit

accurate data acquisition system over the industrial

temperature range (-40°C to +85°C), will need a

voltage reference with a temperature coefficient

(TC) of 1.0ppm/°C if the reference is allowed to

contribute an error equivalent to 1LSB.

Figure 3

shows the required reference TC vs. T change from

25°C for resolution ranging from 8 bits to 20 bits.

0.01

0.1

1

10

100

1000

10000

1

10

100

20 BIT

18 BIT

16 BIT

14 BIT

12 BIT

10 BIT

8 BIT

ReferenceTC

(ppm/°C)

Figure 3

Reference TC vs. T change from 25°C for 1 LSB change

1,5,7,8

)

10

(

)

(

.

6

min

max

min

max

T

V

C

T

al

no

−

=

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