P r o
VRE210
a t i o n F r o m
duct Innov
VRE210
VRE210
DESCRIPTION
Precision Voltage Reference
FEATURES
♦ Very High Accuracy: +10 V Output, ±0.5 mV
♦ Extremely Low Drift: 0.6 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
VRE210 Series Precision Voltage References provide
ultrastable +10 V outputs with ±0.5 mV initial accuracy
and temperature coefficient as low as 0.6 ppm/ºC over
the full military temperature range. This improvement
in accuracy is made possible by a unique, proprietary
multipoint laser compensation technique. Significant
improvements have been made in other performance
parameters as well, including initial accuracy, warm-
up drift, line regulation, and long term 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.
APPLICATIONS
♦
♦
♦
♦
♦
♦
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
Figure 1. BLOCK DIAGRAM
11
SELECTION GUIDE
Model
VRE210C
VRE210CA
VRE210M
VRE210MA
Output (V)
+10
+10
+10
+10
Temperature
Operating Range
-25ºC to +85ºC
-25ºC to +85ºC
-55ºC to +125ºC
-55ºC to +125ºC
Volt Deviation
(Max)
±0.8mV
±0.6mV
±1.2mV
±1.0mV
20-terminal Ceramic LCC
Package Style HD
NOV 2009
1
APEX − VRE210DSREVH
VRE210DS
www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
Product Innovation From
VRE210
2. TYPICAL PERFORMANCE CURVES
V
OUT
vs. TEMPERATURE
V
OUT
vs. TEMPERATURE
1.2
0.8
0.6
-0.6
-1.2
1.0
V
OUT
vs. TEMPERATURE
V
OUT
vs. TEMPERATURE
-0.8
-1.0
Temperature
o
C
VRE210C
Temperature
o
C
VRE210CA
Temperature
o
C
VRE210M
Temperature
o
C
VRE210MA
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
Temperature
o
C
Output Current (mA)
Frequency (Hz)
3. THEORY OF OPERATION
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 amplified 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.
VRE210DS
3
VRE210
4. APPLICATION INFORMATION
Product Innovation From
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 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
3
4
2
1
20
19
18
17
16
15
9 10
11
12 13
14
PIN CONFIGURATION
NC NC NC V
OUT
NC
18 17 16 15 14
NC
19
NC
20
TOP VIEW
+15V
5
6
7
8
13
NC
12
NC
11
TRIM
10
GND
V
OUT
= +10V
NC
NC
NC
1
2
3
VRE210
Δ
4
5
6
7
8
NC V
IN
NC NC NC
Ref. Gnd.
9
REF GND
10KΩ
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 apex.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-
TOMER’S 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 CUSTOMER’S 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.
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VRE210DS
DSP and ARM Processors
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