VRE210
VRE210DS 1
VRE210
DESCRIPTION
VRE210 Series Precision Voltage References provide
ultrastable +10 V outputs with ±0.5 mV initial accuracy
and temperature coefcient as low as 1.11 ppm/ºC over
the full military temperature range. This improvement
in accuracy is made possible by a unique, proprietary
multipoint laser compensation technique. Signicant
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.
FEATURES
♦ Very High Accuracy: +10 V Output, ±0.5 mV
♦ Extremely Low Drift: 1.11 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
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
11
Figure 1. BLOCK DIAGRAM
Model Output (V)
Temperature
Operating Range
Volt Deviation
(Max)
VRE210CA +10 -25ºC to +85ºC ±0.6mV
VRE210M
VRE210MA
+10
+10
-55ºC to +125ºC
-55ºC to +125ºC
±1.2mV
±1.0mV
SELECTION GUIDE
20-terminal Ceramic LCC
Package Style HD
Precision Voltage Reference
VRE210
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP 2012
VRE210DS REVK
VRE210
2 VRE210DS
1. CHARACTERISTICS AND SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VPS =+15V, T = +25ºC, RL = 10KΩ Unless Otherwise Noted.
NOTES:
* Same as CA Models.
1. Using the box method, the specied value is the maximum deviation from the output voltage at 25ºC
over the specied operating temperature range.
2. The specied values are unloaded.
Model VRE210CA VRE210M VRE210MA
Parameter Min Typ Max Min Typ Max Min Typ Max Units
ABSOLUTE MAXIMUM RATINGS
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 VOLTAGE
VRE210 +10 * * V
OUTPUT VOLTAGE ERRORS
Initial Error ±500
±1000
±800 µV
Warmup Drift 1 2 1 ppm
TMIN - TMAX (Note1) 600 1200 1000 µV
Long-Term Stability 6 * * ppm/1000hrs
Noise (0.1 - 10Hz) 6 * * µVpp
OUTPUT CURRENT
Range ±10 * * mA
REGULATION
Line 3 10 * * * * ppm/V
Load 3 * * ppm/mA
OUTPUT ADJUSTMENT
Range 20 * * mV
Temperature Coefcient 4 * * mV/ºC/mV
POWER SUPPLY CURRENT (Note 2)
VRE210 +PS 5 7 * * * * mA
VRE210
VRE210DS 3
Temperature oC
VRE210CA
VOUT vs. TEMPERATURE
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
Temperature oC
VRE210M
VOUT vs. TEMPERATURE
Temperature oC
VRE210MA
VOUT vs. TEMPERATURE
-0.6
0.6
-1.2
1.2
-1.0
1.0
2. TYPICAL PERFORMANCE CURVES
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 amplied 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.
VRE210
4 VRE210DS
4. APPLICATION INFORMATION
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 owing 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
sufciently small that it does not effect performance.
EXTERNAL CONNECTIONS
11 12 13
9 10
18
17
16
15
14
4
5
6
7
8
120 19
32
+15V
VOUT = +10V
Ref. Gnd.
10KΩ
TOP VIEW
VRE210
4 5 6 7 8
19
20
1
2
3
NC
NC
TRIM
GND
REF GND
NC VIN NC NC NC
NC
NC
NC
NC
NC
13
12
11
10
9
NC NC NC VOUT NC
18 17 16 15 14
Δ
PIN CONFIGURATION
NEED TECHNICAL HELP? CONTACT APEX SUPPORT!
For all Apex Microtechnology product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@apexanalog.com.
International customers can also request support by contacting their local Apex Microtechnology Sales Representative.
To nd the one nearest to you, go to www.apexanalog.com
IMPORTANT NOTICE
Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change
without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further
notice to any specications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this informa-
tion, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual
property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the informa-
tion only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. 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.
APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR
LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDER-
STOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER’S RISK.
Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks
of their respective holders.
Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
www.apexanalog.com SEP 2012
VRE210DS REVK
