Voltage Reference. VRE104 Datasheet

VRE104 Reference. Datasheet pdf. Equivalent

VRE104 Datasheet
Recommendation VRE104 Datasheet
Part VRE104
Description Precision Voltage Reference
Feature VRE104; VRE104 VRVER1E01044 Precision Voltage Reference FEATURES ♦ Very High Accuracy: +4.5 V Output, ±0.
Manufacture APEX
Datasheet
Download VRE104 Datasheet




APEX VRE104
VRE104
VRVER1E01044
Precision Voltage Reference
FEATURES
♦ Very High Accuracy: +4.5 V Output, ±0.8 mV
♦ Extremely Low Drift: 1.48 ppm/°C (-55°C to
+125°C)
♦ Excellent Stability: 6 ppm/1000 Hrs. Typical
♦ Excellent Line Regulation: 6 ppm/V Typical
♦ Wide Supply Range: +13.5 to +22.0 V
♦ Hermetic 14-pin Ceramic DIP
♦ Military Processing Options
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
DESCRIPTION
VRE104 Series Precision Voltage References provide
ultrastable +4.5 V outputs with up to ±0.8 mV initial
accuracy and temperature coefficient as low as 1.48
ppm/°C over the full military temperature range.
These references are specifically designed to be used
with the Crystal Semiconductor line of successive-ap-
proximation type Analog to Digital Converters (ADCs).
This line of ADCs sets new standards for temperature
drift, which can only be as good as the external refer-
ence used. The VRE104 combined with an ADC will
provide the lowest drift data conversion obtainable.
VRE104 series devices are available in two operat-
ing 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 the
VRE104 ideal for all precision applications which may
require a 4.5 V reference. High-accuracy test and
measurement instrumentation, and transducer exci-
tation are some other applications which can benefit
from the high accuracy of the VRE104.
Figure 1. BLOCK DIAGRAM
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Copyright © Apex Microtechnology, Inc. 2012
(All Rights Reserved)
SEP
VRE104DS
R20E1V21I



APEX VRE104
VRE104
SELECTION GUIDE
Model
VRE104C
VRE104CA
VRE104MA
Output (V)
+4.5
+4.5
+4.5
Temperature
Operating Range
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
Volt Deviation (MAX)
±0.49mV
±0.40mV
±0.60mV
1. CHARACTERISTICS AND SPECIFICATIONS
Hermetic 14-pin Ceramic DIP
Package Style HC
ELECTRICAL SPECIFICATIONS
VPS =+15V, T = 25°C, RL = 10K Ω UNLESS OTHERWISE NOTED.
Grade
VRE104C
VRE104CA
Parameter
Min Typ Max Min Typ Max
ABSOLUTE MAXIMUM RATINGS
Power Supply
+13.5
+22 *
*
Operating Temperature -25
+85 *
*
Storage Temperature
-65
+150
*
*
Short Circuit Protection
Continuous
*
OUTPUT VOLTAGE
VRE104
+4.5
*
OUTPUT VOLTAGE ERRORS
Initial Error
±890
±800
Warmup Drift
2
1
TMIN - TMAX
(Note1)
Long-Term Stability
490
6
400
*
Noise (0.1 - 10Hz)
3
*
OUTPUT CURRENT
Range
±10
*
REGULATION
Line
6 10
**
Load
3*
OUTPUT ADJUSTMENT
Range
10 *
Temperature Coefficient
4
*
POWER SUPPLY CURRENT (Note 2)
VRE104 +PS
57
**
VRE104MA
Min Typ Max
Units
**
-55 +125
**
*
V
ºC
ºC
*V
±800
µV
1 ppm
600 µV
* ppm/1000hrs
* µVpp
* mA
**
ppm/V
* ppm/mA
* mV
* µV/ºC/mV
**
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.
2 VRE104DS



APEX VRE104
2. TYPICAL PERFORMANCE GRAPHS
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
0.49
-0.49
0.4
-0.4
VRE104
VOUT vs. TEMPERATURE
0.6
-0.6
Temperature oC
VRE104C
Temperature oC
VRE104CA
QUIESCENT CURRENT VS. TEMP JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
VRE104MA
PSRR VS. FREQUENCY
Temperature oC
Output Current (mA)
Frequency (Hz)
3. THEORY OF OPERATION
The following discussion refers to the block diagram in Figure 1. A FET current source is used to bias a 6.3 V zener
diode. The zener voltage is divided by the resistor network R1 and R2. This voltage is then applied to the noninvert-
ing input of the operational amplifier which amplifies the voltage to produce a 4.5 V output. The gain is determined
by the resistor networks R3 and R4: G=1 + R4/R3. The 6.3 V zener diode is used because it is the most stable
diode over time and temperature.
The current source provides a closely regulated zener current, which determines the slope of the references’ volt-
age 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 method leaves a residual error over wide temperature
ranges.
To remove this residual error, a nonlinear compensation network of thermistors and resistors has been developed
that is used in the VRE104 series references. This proprietary network eliminates most of the nonlinearity in the
voltage vs. temperature function. By then adjusting the slope, the VRE104 series 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.
VRE104DS
3







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