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VRE100/101/102
Precision
Reference Supplies
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
VERY HIGH ACCURACY: 10.000 V OUTPUT ±0.5 mV
EXTREMELY LOW DRIFT: 0.5 ppm/°C 55°C to +125°C
LOW WARM-UP DRIFT: 1.0 ppm Typ.
EXCELLENT STABILITY: 6 ppm/1000 Hrs. Typ.
EXCELLENT LINE REGULATION: 3 ppm/V Typ.
HERMETIC 14-PIN CERAMIC DIP
MILITARY PROCESSING OPTION
PIN & FUNCTION COMPATIBLE WITH
AD2700, AD2710 Series
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 INSTRUMENTS
DESCRIPTION
SELECTION GUIDE
VRE100 Series Precision Voltage References
provide ultrastable +10.000V (VRE100), -
10.000V (VRE101) and ±10.000V (VRE102)
outputs with ±0.5 mV initial accuracy and
temperature coefficient as low as 0.5 ppm/°C
over the full military temperature range. This
improvement in accuracy is made possible by a
unique, proprietary multipoint laser compensation
technique developed by Thaler Corporation.
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 VRE100 series the
most accurate and stable 10V reference
available.
Type
VRE100C
VRE100CA
VRE100M
VRE100MA
VRE101C
VRE101CA
VRE101M
VRE101MA
Output
Temperature
Operating Range
+10V
+10V
+10V
+10V
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
-10V
-10V
-10V
-10V
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
Max. Volt
Deviation
0.6mV
0.3mV
1.0mV
0.5mV
0.6mV
0.3mV
1.0mV
0.5mV
VRE102C
VRE102CA
VRE102M
VRE102MA
±10V
±10V
±10V
±10V
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
0.6mV
0.3mV
1.0mV
0.5mV
VRE100/101/102 devices are available in two operating temperature ranges, -25°C to +85°C and -55°C to
+125°C, and two performance grades. All devices are packaged in 14-pin hermetic ceramic packages for
maximum long-term stability. "M" versions are screened for high reliability and quality.
Superior stability, accuracy, and quality make these references ideal for precision applications such as A/D
and D/A converters, high-accuracy test and measurement instrumentation, and transducer excitation.
VRE100DS REV. D MAY 1995
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ELECTRICAL SPECIFICATIONS
Vps =±15V, T = 25°C, RL = 10Kunless otherwise noted.
VRE100/101/102
MODEL
C CA M MA
PARAMETERS
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
UNITS
ABSOLUTE MAXIMUM RATINGS
Power Supply
±13.5
±22
Operating Temperature -25
85
Storage Temperature -65
150
Short Circuit Protection Continuous
*
*
*
**
**
*
* -55
125 -55
125
**
**
*
***
V
°C
°C
OUTPUT VOLTAGE
VRE100
VRE101
VRE102
+10 * * * V
-10 * * * V
±10 * * * V
OUTPUT VOLTAGE ERRORS
Initial Error
Warmup Drift
Tmin - Tmax (1)
Long-Term Stability
Noise (.1-10Hz)
1.0
2
0.6
6
6
0.5
1
0.3
*
*
1.5
2
1.0
*
*
0.8 mV
1 ppm
0.5 mV
* ppm/1000hr.
* µVpp
OUTPUT CURRENT
Range
±10 *
*
*
REGULATION
Line
Load
3 10
3
**
*
**
*
**
*
OUTPUT ADJUSTMENT
Range
20 * * *
Temperature Coefficient
4
*
*
*
(2)
POWER SUPPLY CURRENTS
VRE100 +PS
VRE101 -PS
VRE102 +PS
VRE102 -PS
57
57
79
46
**
**
**
**
**
**
**
**
**
**
**
**
NOTES: *Same as C Models.
1.Using the box method, the specified value is the
maximum deviation from the output voltage at 25°C
over the specified operating temperature range.
2.The specified values are unloaded.
mA
ppm/V
ppm/mA
mV
µV/°C/mV
mA
mA
mA
mA
4-21
VRE100DS REV. D MAY 1995

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TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE100/101/102C
Temperature oC
VRE100/101/102CA
Temperature oC
VRE100/101/102M
Temperature oC
VRE100/101/102MA
QUIESCENT CURRENT VS. TEMP
VRE100/101
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
PSRR VS. FREQUENCY
Temperature oC
Output Current (mA)
QUIESCENT CURRENT VS. TEMP
VRE102
POSITIVE OUTPUT
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Frequency (Hz)
PSRR VS. FREQUENCY
Temperature oC
QUIESCENT CURRENT VS. TEMP
Output Current (mA)
NEGATIVE OUTPUT
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Frequency (Hz)
PSRR VS. FREQUENCY
Temperature oC
Output Current (mA)
Frequency (Hz)
VRE100DS REV. D MAY 1995
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DISCUSSION OF PERFORMANCE
THEORY OF OPERATION
The following discussion refers to the schematic
below. 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
10.000V 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. temperature 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.
Thaler Corporation has developed 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 adjusting 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.
APPLICATION INFORMATION
Figure 1 shows the proper connection of the
VRE100 series voltage reference with the optional
trim resistors. When trimming the VRE102, the
positive voltage should be trimmed first since the
negative voltage tracks the positive side. Pay careful
attention to the circuit layout to avoid noise pickup
and voltage drops in the lines.
The VRE100 series voltage references have the
ground terminal brought out on two pins (pin 6 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 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 20ppm.
By connecting pin 7 to the power supply ground and
pin 6 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 doesn't effect performance. The VRE series
voltage references can be connected with or without
the use of pin 6 and still provide performance
superior to the 2700 and 2710 series voltage
references.
VRE100
VRE102
4-23
VRE100DS REV. D MAY 1995

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FIGURE 1
EXTERNAL CONNECTIONS
1. Optional Fine Adjust for approximately ±20mV. VRE101 center tap connects to -PS.
PIN CONFIGURATION
TOP VIEW
NC
NC
NC
NC
NC
REF.
GND
GND
VRE100
FINE
ADJ.
+10V
FINE
ADJ.
+PS
NC
NC
NC
TOP VIEW
NC
NC
NC
NC
NC
REF.
GND
GND
VRE101
FINE
ADJ.
-10V
FINE
ADJ.
-PS
NC
NC
NC
TOP VIEW
-ADJ.
-10V
-ADJ.
-PS
NC
REF.
GND
GND
VRE102
+ADJ.
+10V
+ADJ.
+PS
NC
NC
NC
14-PIN HYBRID
PACKAGE
MECHANICAL
INCHES MILLIMETER
INCHES MILLIMETER
DIM MIN MAX MIN MAX DIM MIN MAX MIN MAX
E .480 .500 12.1 12.7 A .120 .155 3.0 4.0
L .195 .215 4.9 5.4 Q .015 .035 0.4 0.9
D .775 .805 19.7 20.4 Q1 N/A .030 N/A 0.7
B .016 .020 0.4 0.5 C .009 .012 0.2 0.3
B1 .038 .042 0.9 1.0 G1 .290 .310 7.3 7.8
B2 .095 .105 2.4 2.6
S .085 .105 2.1 2.6
P .004 .006 0.10 0.15
VRE100DS REV. D MAY 1995
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