CIRRUS VRE107M

VRE107
VRE107
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Precision Voltage Reference
Features
♦ Very High Accuracy: ±5 V, ±0.4 mV
♦ Extremely Low Drift: 0.6 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 V to ±22 V
♦ Hermetic 14-pin Ceramic DIP
♦ Military Processing Option
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
VRE107 Series Precision Voltage References provide
ultrastable ±5 V outputs with ±0.4 mV initial accuracy
and temperature coefficient as low as 0.6 ppm/°C over
the full military temperature range. This impovement
in accuracy is made possible by a unique, proprietary
multipoint laser compensation technique.
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 VRE107 series the most accurate
and stable 5 V references available.
VRE107 series 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 stablity. “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 tranducer excitation.
Figure 1. Block Diagram
VRE107DS
http://www.cirrus.com
Copyright
© Cirrus
Logic, Inc. 2009
(All Rights Reserved)
MAR 2009 APEX − VRE107DSREVD
VRE107
P r o d u c t I n n o v a t i o nF r o m
Selection Guide
Model
Output (V)
Temperature
Operating Range
Volt Deviation (MAX)
±5
±5
-55°C to +125°C
-55°C to +125°C
±0.6mV
±0.3mV
VRE107M
VRE107MA
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.
Model
VRE107M
Parameter
Min
VRE107MA
Typ
Max
Min
Typ
Max
Units
ABSOLUTE MAXIMUM RATINGS
Power Supply
±13.5
±22
*
*
V
Operating Temperature
-55
+125
*
*
ºC
Storage Temperature
-65
+150
*
*
ºC
Short Circuit Protection
Continuous
*
±5
*
OUTPUT VOLTAGE
VRE107
V
OUTPUT VOLTAGE ERRORS
Initial Error
±800
Warmup Drift
TMIN - TMAX
±400
2
1
(Note1)
µV
ppm
600
300
µV
Long-Term Stability
6
*
ppm/1000hrs.
Noise (0.1 - 10Hz)
3
*
µVpp
OUTPUT CURRENT
Range
±10
*
mA
REGULATION
Line
6
10
*
*
ppm/V
Load
3
*
ppm/mA
Range
10
*
mV
Temperature Coefficient
4
*
µV/ºC/mV
OUTPUT ADJUSTMENT
POWER SUPPLY CURRENT (Note 2)
VRE107 +PS
7
9
*
*
mA
VRE107 -PS
4
6
*
*
mA
NOTES:
* Same as M 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.
VRE107DS
VRE107
P r o d u c t I n n o v a t i o nF r o m
TYPICAL PERFORMANCE GRAPHS
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE107M
Temperature oC
VRE107MA
POSITIVE OUTPUT
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
NEGATIVE OUTPUT
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
2. 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 noninverting input of the operational amplifier which amplifies the voltage to produce a 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 reference’s 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 method leaves a residual error over wide temperature
ranges.
VRE107DS
VRE107
P r o d u c t I n n o v a t i o nF r o m
To remove this residual error, a nonlinear compensation network of thermistors and resistors is used in the VRE107
series references. This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the slope, The VRE107 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.
3. APPLICATION INFORMATION
The proper connection of the VRE107 series voltage reference is shown below with the optional trim resistors.
When trimming the VRE107, 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 VRE107 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 20 ppm. 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.
EXTERNAL CONNECTIONS
3. Optional Fine Adjust for approximately ±10mV.
PIN CONFIGURATION
TOP VIEW
FINE +ADJ.
FINE -ADJ.
-5V
+5V
FINE +ADJ.
FINE -ADJ.
-PS
VRE107
+PS
NC
NC
REF. GND
NC
GND
NC
VRE107DS
VRE107
P r o d u c t I n n o v a t i o nF r o m
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
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VRE107DS