P r o d u c t I n n o v a t i o n F r o m

VRE306



VRE306DS

The proper connection of the VRE306 series voltage references with the optional trim resistor for initial error and

the optional capacitor for noise reduction is shown below. The VRE306 reference has the ground terminal brought

out on two pins (pin 4 and pin 7) which are connected together internally. This allows the user to achieve greater

accuracy when using a socket. Voltage references have a voltage drop across their power supply ground pin due to

quiescent current flowing through the contact resistance. If the contact resistance was constant with time and tem-

perature, this voltage drop could be trimmed out. When the reference is plugged into a socket, this source of error

can be as high as 20 ppm. By connecting pin 4 to the power supply ground and pin 7 to a high impedance ground

point in the measurement circuit, the error due to the contact resistance can be eliminated. If the unit is soldered

into place, the contact resistance is sufficiently small that it does not effect performance. Pay careful attention to the

circuit layout to avoid noise pickup and voltage drops in the lines.

EXTERNalCONNECTIONS

8

4

6

5

2

VRE306

10kW

1µF

OPTIONAL

NOISE REDUCTION

CAPACITOR

OPTIONAL

FINE TRIM

ADJUSTMENT

3

7

REF. GND

5

6

7

8

VRE306

TOP

VIEW

1

2

3

4

N/C

TEMP

GND

NOISE

REDUCTION

REF. GND

TRIM

CONTaCTINGCIRRuSlOGICSuPPORT

For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.

For inquiries via email, please contact tucson.support@cirrus.com.

International customers can also request support by contacting their local Cirrus Logic Sales Representative.

To find the one nearest to you, go to www.cirrus.com

IMPORTANT NOTICE

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PINCONFIGuRaTION