VRE410
Precision
Dual Reference
DESCRIPTION
FEATURES
The VRE410 is a low cost, high precision, 10.0V
reference. Packaged in 14 pin DIP or SMT
packages, the device is ideal for new designs that
need a high performance reference.
The device provides ultrastable 10.000V output
with 1.000 mV (.01%) initial accuracy and a
temperature coefficient of 0.6 ppm/C. This
improvement in accuracy is made possible by a
unique, patented multipoint laser compensation
technique developed by Thaler Corporation.
Another key feature of this reference is the 0.5 mV
maximum tracking error between the positive and
negative output voltages over the full operating
temperature range. This is extremely important in
high performance systems for reducing overall
system errors.
For designs which use the DIP package in a
socket, there is a reference ground pin to
eliminate reference ground errors.
The VRE410 is recommended for use as a
reference for high precision D/A and A/D
converters which require an external precision
reference. The device is also ideal for calibrating
scale factor on high resolution A/D converters.
The VRE410 offers superior performance over
monolithic references.
10.000 V OUTPUT 1.000 mV (.01%)
TEMPERATURE DRIFT: 0.6 ppm/C
LOW NOISE: 6
V
pp
(0.1-10Hz)
TRACKING ERROR: 0.5 mV max.
EXCELLENT LINE REGULATION: 6ppm/V Typ.
SURFACE MOUNT AND DIP PACKAGES
FIGURE 1
VRE410DS REV. A MAY 1996
SELECTION GUIDE
Model
Temp.
Range
C
Temp.
Coeff.
ppm/
C
VRE410A
1.0
0.6
0C to +70C
VRE410B
1.6
1.0
0C to +70C
VRE410C
2.0
2.0
0C to +70C
VRE410J
1.0
0.6
-40C to +85C
VRE410K
1.6
1.0
-40C to +85C
VRE410L
2.0
2.0
-40C to +85C
For package option add D for DIP or S for Surface
Mount to end of model number.
Initial
Error
mV
THALER CORPORATION 2015 N. FORBES BOULEVARD TUCSON, AZ. 85745 (520) 882-4000
11
12
13
14
VRE410
TOP
VIEW
1
2
3
4
N/C
+V
IN
GND
REF. GND
+V
OUT
PIN CONFIGURATION
5
6
7
10
9
8
-
V
OUT
N/C
-
V
IN
N/C
N/C
N/C
N/C
N/C
N/C
MODEL
A/J
B/K
C/L
PARAMETER
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
ABSOLUTE RATINGS
Power Supply
13.5
15
22
*
*
*
*
*
*
V
Operating Temp. (
A,B,C
)
0
+70
*
*
*
*
C
Operating Temp. (
J,K,L
)
-40
+85
*
*
*
*
C
Storage Temperature
-65
+150
*
*
*
*
C
Short Circuit Protection
Continuous
*
*
OUTPUT VOLTAGE
VRE410
10.00
*
*
V
OUTPUT VOLTAGE ERRORS
Initial Error
1.00
1.60
2.00
mV
Warmup Drift
1
2
3
ppm
T
min
- T
max
0.6
1.0
2.0
ppm/
C
Tracking Error
0.5
0.7
1.0
mV
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
POWER SUPPLY CURRENTS
+PS
7
9
*
*
*
*
mA
-PS
4
6
*
*
*
*
mA
VRE410
NOTES: *Same as A/J Models.
1. The specified values are without external trim.
2. The temperature coefficient (tc) is determined by the
box method using the following formula:
V
max
- V
min
tc =
x 10
6
V
nominal
x (T
max
-T
min
)
3. The tracking error is the deviation between the
positive and negative output over the operating temp.
range.
(1)
(4)
(2)
(3)
VRE410DS REV. A MAY 1996
Vps =
15V, T = 25C, RL = 10K
unless otherwise noted.
ELECTRICAL SPECIFICATIONS
4. The specified values are unloaded.
TYPICAL PERFORMANCE CURVES
VRE410DS REV. A MAY 1996
Temperature
o
C
VRE410A
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE410B
V
OUT
vs. TEMPERATURE
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE410C
Temperature
o
C
VRE410J
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE410K
V
OUT
vs. TEMPERATURE
Temperature
o
C
VRE410L
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)
QUIESCENT CURRENT VS. TEMP
Temperature
o
C
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
POSITIVE OUTPUT (TYP)
NEGATIVE OUTPUT (TYP)
DISCUSSION OF PERFORMANCE
VRE410DS REV. A MAY 1996
VRE410
FIGURE 2
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.
The VRE400 series voltage references have the
ground terminal brought out on two pins (pin 6 and 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.
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