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VRE210
Precision Surface Mount
Reference Supplies
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
• PIN AND FUNCTION COMPATIBLE WITH REF01
• VERY HIGH ACCURACY: 10.000 V OUTPUT ±0.3 mV
• EXTREMELY LOW DRIFT: 0.5 ppm/°C 55°C to +125°C
• LOW WARM-UP DRIFT: 1 ppm Typ.
• EXCELLENT STABILITY: 6 ppm/1000 Hrs. Typ.
• EXCELLENT LINE REGULATION: 3 ppm/V Typ.
• HERMETIC 20 TERMINAL CERAMIC LCC
• MILITARY PROCESSING OPTION
DESCRIPTION
VRE210 Series Precision Voltage References
provide ultrastable +10.000V outputs with ±0.3
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 VRE210 series the
most accurate and stable 10V surface mount
references available.
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
SELECTION GUIDE
Type
VRE210C +10V -25°C to +85°C 0.6mV
VRE210CA +10V -25°C to +85°C 0.3mV
VRE210M +10V -55°C to +125°C 1.0mV
VRE210MA +10V -55°C to +125°C 0.5mV
Output
Temperature
Operating Range
Max. Volt
Deviation
VRE210 devices are available in two operating
temperature ranges, -25°C to +85°C and -55°C to
+125°C, 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.
VRE210DS REV. C JUNE 1995
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ELECTRICAL SPECIFICATIONS
Vps =±15V, T = 25°C, RL = 10KΩ unless otherwise noted.
VRE210
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 * * * * * * V
Operating Temperature -25 85 * * -55 125 -55 125 °C
Storage Temperature -65 150 * * * * * * °C
Short Circuit Protection Continuous * * *
OUTPUT VOLTAGE
VRE210 +10 * * * V
OUTPUT VOLTAGE ERRORS
Initial Error 500 300 800 400 µV
Warmup Drift 2 1 2 1 ppm
T
- T
min
max
(1)
600 300 1000 500 µV
Long-Term Stability 6 * * * ppm/1000hrs
Noise (.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 Coeff. 4 * * * mV/°C/mV
POWER SUPPLY CURRENTS
(2)
VRE210 +PS 5 7 * * * * * * mA
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.
VRE210DS REV. C JUNE 1995
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TYPICAL PERFORMANCE CURVES
V
vs. TEMPERATURE
OUT
V
OUT
vs. TEMPERATURE
Temperature oC
VRE210C
V
vs. TEMPERATURE
OUT
Temperature oC
VRE210M
Temperature oC
VRE210CA
V
vs. TEMPERATURE
OUT
Temperature oC
VRE210MA
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE210DS REV. C JUNE 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 2 shows the proper connection of the
VRE210 series voltage references with the optional
trim resistors. 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 20ppm.
By connecting 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.
VRE210
FIGURE 1
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FIGURE 2
EXTERNAL CONNECTIONS
2
1
20
19
18
17
16
15
14
139
12
10
11
↓
+15V
3
4
5
6
7
8
Ref. Gnd.
10kΩ
PIN CONFIGURATION
NC NC NC NC NC
1 20 19
TOP VIEW
VRE210
11 12 13
NC NCTRIMGND
18
17
16
15
14
NC
NC
NC
V
NC
NC
V
NC
NC
NC
3 2
4
5
IN
6
7
8
9 10
REF
GND
OUT
V
OUT
= +10V
MECHANICAL
DIM
A 0.090 0.110 2.29 2.79
B 0.022 0.028 0.56 0.71
D 0.342 0.358 8.68 9.09
D1 0.048 0.052 1.22 1.32
E 0.342 0.358 8.68 9.09
E1 0.045 0.055 1.114 1.40
j 0.010 REF .254 REF
h 0.040 REF 1.02 REF
L 0.045 0.055 1.14 1.40
MIN
INCHES
MAX
MILLIMETER
MIN
VRE210DS REV. C JUNE 1995
MAX
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