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

VRE205

4

VRE205DS

4. aPPlICaTION INFORMaTION

The proper connection of the VRE205 series voltage references with the optional trim resistor is shown below. Pay

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

The VRE205 series voltage references have the ground terminal brought out on two pins (pin 9 and pin 10) 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 temperature, 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 con-

necting pin 10 to the power supply ground and pin 9 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.

EXTERNal CONNECTIONS

11 12 13

9 10

18

17

16

15

14

4

5

6

7

8

1 20 19

3

2

+15V

10KΩ

Ref. Gnd.

TOP VIEW

VRE205

4

5

6

7

8

19

20

1

2

3

NC

NC

TRIM

GND

REF GND

NC V

IN

NC NC NC

NC

NC

NC

NC

NC

13

12

11

10

9

NC NC NC V

18 17 16 15 14

Δ

CONTaCTING CIRRuS lOGIC SuPPORT

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

Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject

to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant

information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale

supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. no responsibility is assumed by Cirrus

for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third

parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,

copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-

sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent

does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIn APPLICATIOnS USInG SEMICOnDUCTOR PRODUCTS MAY InVOLVE POTEnTIAL RISKS OF DEATH, PERSOnAL InJURY, OR SEVERE PROP-

ERTY OR EnVIROnMEnTAL DAMAGE (“CRITICAL APPLICATIOnS”). CIRRUS PRODUCTS ARE nOT DESIGnED, AUTHORIZED OR WARRAnTED TO BE

SUITABLE FOR USE In PRODUCTS SURGICALLY IMPLAnTED InTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-

UCTS OR OTHER CRITICAL APPLICATIOnS. InCLUSIOn OF CIRRUS PRODUCTS In SUCH APPLICATIOnS IS UnDERSTOOD TO BE FULLY AT THE CUS-

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CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS In CRITICAL APPLICATIOnS, CUSTOMER AGREES,

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All other brand and product names in this document may be trademarks or service marks of their respective owners.

PIN CONFIGuRaTION