PIN AND FUNCTION COMPATIBLE WITH REF01
VERY HIGH ACCURACY: 10.000 V OUTPUT 0.3 mV
EXTREMELY LOW DRIFT: 0.5 ppm/C 55C to +125C
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
VRE210
Precision Surface Mount
Reference Supplies
DESCRIPTION
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
FEATURES
SELECTION GUIDE
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.
VRE210 devices are available in two operating
temperature ranges, -25C to +85C and -55C to
+125C, 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.
Type
Output
Temperature
Operating Range
Max. Volt
Deviation
VRE210C
+10V
-25C to +85C
0.6mV
VRE210CA
+10V
-25C to +85C
0.3mV
VRE210M
+10V
-55C to +125C
1.0mV
VRE210MA
+10V
-55C to +125C
0.5mV
VRE210DS REV. C JUNE 1995
THALER CORPORATION 2015 N. FORBES BOULEVARD TUCSON, AZ. 85745 (520) 882-4000
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
V
Warmup Drift
2
1
2
1
ppm
T
min
- T
max
600
300
1000
500
V
Long-Term Stability
6
*
*
*
ppm/1000hrs
Noise (.1-10Hz)
6
*
*
*
Vpp
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
VRE210 +PS
5
7
*
*
*
*
*
*
mA
VRE210
NOTES: *Same as C Models.
1.Using the box method, the specified value is the
maximum deviation from the output voltage at 25C
over the specified operating temperature range.
2.The specified values are unloaded.
(1)
(2)
VRE210DS REV. C JUNE 1995
Vps =15V, T = 25C, RL = 10K
unless otherwise noted.
ELECTRICAL SPECIFICATIONS
TYPICAL PERFORMANCE CURVES
VRE210DS REV. C JUNE 1995
Temperature
o
C
VRE210C
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE210CA
V
OUT
vs. TEMPERATURE
QUIESCENT CURRENT VS. TEMP
Temperature
o
C
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
Temperature
o
C
VRE210M
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE210MA
V
OUT
vs. TEMPERATURE
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.
DISCUSSION OF PERFORMANCE
VRE210
FIGURE 1
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.
VRE210DS REV. C JUNE 1995
EXTERNAL CONNECTIONS
FIGURE 2
MECHANICAL
PIN CONFIGURATION
REF
GND
TOP VIEW
VRE210
11
12 13
9
10
18
17
16
15
14
4
5
6
7
8
1
20 19
3
2
NC
NC
NC
NC
V
IN
NC
NC
TRIM
GND
NC
NC
V
OUT
NC
NC
NC NC NC NC NC
11
12 13
9 10
18
17
16
15
14
4
5
6
7
8
1
20
19
3
2
+15V
V
OUT
= +10V
10k
Ref. Gnd.
VRE210DS REV. C JUNE 1995
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
DIM
INCHES
MIN
MAX
MAX
MILLIMETER
MIN
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