vre210 vre210ds 1 vre210 description vre210 series precision voltage references provide ultrastable +10 v outputs with 0.3 mv initial accuracy and temperature coeffcient as low as 0.5 ppm/oc over the full military temperature range. this improvement in accuracy is made possible by a unique, proprietary multipoint laser compensation technique. signifcant improvements have been made in other performance parameters as well, including initial accuracy, warm- up drift, line regulation, and longterm stability, making the vre210 series the most accurate and stable 10 v surface mount references available. vre210 devices are available in two operating tem - perature ranges, -25oc to +85oc and -55oc to +125oc, and two electrical performance grades. all devices are packaged in 20-terminal ceramic lcc packages for maximum long-term stability. m versions are screened for high reliability and quality. fea tures ? very high accuracy: +10 v output, 0.3 mv ? extremely low drift: 0.5 ppm/oc (-55oc to +125oc) ? low warm-up drift: 1 ppm typical ? excellent stability: 6 ppm/1000 hrs. typical ? excellent line regulation: 3 ppm/v typical ? hermetic 20-terminal ceramic lcc package ? military processing option applica tions ? precision a/d and d/a converters ? transducer excitation ? accurate comparator threshold reference ? high resolution servo systems ? digital voltmeters ? high precision test and measurement instru - ments 1 1 figure 1. block diagram model output (v) temperature operating range volt deviation (max) vre210c VRE210CA +10 +10 -25oc to +85oc -25oc to +85oc 0.6mv 0.3mv vre210m vre210ma +10 +10 -55oc to +125oc -55oc to +125oc 1.0mv 0.5mv selection guide 20-terminal ceramic lcc package style hd precision voltage reference vre210 p r o d u c t i n n o v a t i o n f r o m copyright ? cirrus logic, inc. 2009 (all rights reserved) http://www.cirrus.com jul 2009 apex ? vre210dsrevg p r o d u c t i n n o v a t i o n f r o m
vre210 2 vre210ds 1. characteristics and specifica tions electrical specifica tions v ps =+ 15v, t = +25oc, r l = 10k unless otherwise noted . notes: * same as c models. 1. using the box method, the specifed value is the maximum deviation from the output voltage at 25oc over the specifed operating temperature range. 2. the specifed values are unloaded. model vre210c VRE210CA vre210m vre210ma parameter min typ max min typ max min typ max min typ max units absolute maximum ra tings power supply +13.5 +22 * * * * * * v operating temperature -25 +85 * * -55 +125 -55 +125 oc storage temperature -65 +150 * * * * * * oc short circuit protection continuous * * * output vol t age vre210 +10 * * * v output vol t age errors initial error 500 300 800 400 v warmup drift 2 1 2 1 ppm t min - t max (note1) 600 300 1000 500 v long-term stability 6 * * * ppm/1000hrs noise (0.1 - 10hz) 6 * * * vpp output current range 10 * * * ma regula tion line 3 10 * * * * * * ppm/v load 3 * * * ppm/ma output adjustment range 20 * * * mv temperature coeffcient 4 * * * mv/oc/mv power suppl y c urrent (note 2) vre210 +ps 5 7 * * * * * * ma p r o d u c t i n n o v a t i o n f r o m
vre210 vre210ds 3 t em p erat u re o c vre210c v out v s . temper a t ure t em p erat u re o c vre210 c a v out v s . temper a t ure qu i es c e n t curr en t v s . t e m p t em p erat u re o c j u n c t i on te m p . r i se vs . outpu t c u r r en t outpu t curre nt (m a ) p s rr v s . fr eq uenc y fr e qu e n c y (hz ) t em p erat u re o c v r e 210 m v out v s . temper a t ure t em p erat u re o c v r e 210 m a v out v s . temper a t ure 2. typical performance cu rves 3. theory of oper a tion the following discussion refers to the block diagram in figure 1. in operation, approximately 6.3 volts is applied to the noninverting input of the op amp. the voltage is amplifed by the op amp to produce a 10 v output. the gain is determined by the networks r1 and r2: g=1 + r2/r1. the 6.3v zener diode is used because it is the most stable diode over time and temperature. the zener operating current is derived from the regulated output voltage through r3. this feedback arrangement provides a closely regulated zener current. this current determines the slope of the references voltage vs. tempera - ture function. by trimming the zener current a lower drift over temperature can be achieved. but since the voltage vs. temperature function is nonlinear this compensation technique is not well suited for wide temperature ranges. a nonlinear compensation network of thermistors and resistors that is used in the vre series voltage references. this proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. by then adjust - ing the slope, thaler corporation produces a very stable voltage over wide temperature ranges. this network is less than 2% of the overall network resistance so it has a negligible effect on long term stability. by using highly stable resistors in our network, we produce a voltage reference that also has very good long term stability. p r o d u c t i n n o v a t i o n f r o m
vre210 4 vre210ds 4. applica tion informa tion the proper connection of the vre210 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 vre210 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 fowing 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 suffciently small that it does not effect performance. external connections 1 1 1 2 1 3 9 1 0 1 8 1 7 1 6 1 5 1 4 4 5 6 7 8 1 2 0 1 9 3 2 +1 5 v v o u t = +1 0 v ref . gnd . 10k? top vie w vre21 0 4 5 6 7 8 1 9 20 1 2 3 n c nc trim gnd ref gnd n c v in n c n c n c n c n c n c n c nc 1 3 12 11 10 9 n c nc n c v out n c 18 17 16 15 14 pin configura tion cont acting 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 apex.support@cirrus.com. international customers can also request support by contacting their local cirrus logic sales representative. to fnd 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, indemnifcation, 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 - tomers risk and cirrus disclaims and makes no warranty, express, statutory or implied, including the implied warranties of merchantability and fitness for particular purpose, with regard to any cirrus product that is used in such a manner. if the customer or customers customer uses or permits the use of cirrus products in critical applications, customer agrees, by such use, to fully indemnify cirrus, its officers, directors, employees, distributors and other agents from any and all liability, including attorneys fees and costs, that may result from or arise in connection with these uses. cirrus logic, cirrus, and the cirrus logic logo designs, apex precision power, apex and the apex precision power logo designs are trademarks of cirrus logic, inc. all other brand and product names in this document may be trademarks or service marks of their respective owners. p r o d u c t i n n o v a t i o n f r o m
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