CIRRUS VRE117_1

VRE117/119
VRE117/119
P r o d u c t I VRE119
nnovation From
VRE117,
Precision Voltage Reference
FEATURES
♦ Very High Accuracy: ±3 V Output, ±300 µV
♦ Extremely Low Drift: 0.73 ppm/°C (-55°C to
+125°C)
♦ Low Warm-up Drift: 1 ppm Typical
♦ Excellent Stability: 6 ppm/1000 Hrs. Typical
♦ Excellent Line Regulation: 3 ppm/V Typical
♦ 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
VRE117/119 Series Precision Voltage References provide ultrastable +3 V (VRE117), and ±3 V (VRE119)
output with ±300 µV initial accuracy and temperature
coefficient as low as 0.73 ppm/°C over the full military
temperature range. This improvement 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 VRE117/119
series the most accurate and stable 3 V reference
available.
VRE117/119 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 stability. “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 transducer excitation.
Figure 1. BLOCK DIAGRAMS
VRE117
VRE119
VRE117DS
www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
NOV 20091
APEX − VRE117DSREVE
VRE117/119
Product Innovation From
SELECTION GUIDE
Output (V)
Temperature
Operating Range
Volt Deviation (MAX)
VRE117M
VRE117MA
+3
+3
-55°C to +125°C
-55°C to +125°C
±460µV
±400µV
VRE119C
±3
-25°C to +85°C
±400µV
Model
Hermetic 14-pin Ceramic DIP
Package Style HC
1. CHARACTERISTICS AND SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VPS =±15V, T = +25°C, RL = 10K Ω UNLESS OTHERWISE NOTED.
Model
Parameter
VRE119C
Min
Typ
VRE117M
Max
Min
±22
Typ
VRE117MA
Max
Min
*
*
Typ
Max
Units
*
*
V
ABSOLUTE MAXIMUM RATINGS
Power Supply
±13.5
Operating Temperature
-25
+85
-55
+125
-55
+125
ºC
Storage Temperature
-65
+150
*
*
*
*
ºC
Short Circuit Protection
Continuous
*
*
VRE117
+3.0
*
*
V
VRE119
±3.0
*
*
V
OUTPUT VOLTAGE
OUTPUT VOLTAGE ERRORS
Initial Error
±360
Warmup Drift
TMIN - TMAX
±360
2
(Note1)
±300
2
400
1
460
µV
ppm
400
µV
Long-Term Stability
6
*
*
ppm/1000hrs.
Noise (0.1 - 10Hz)
1.5
*
*
µVpp
OUTPUT CURRENT
Range
±10
*
*
mA
REGULATION
Line
3
10
*
*
*
*
ppm/V
Load
3
*
*
ppm/mA
Range
5
*
*
mV
Temperature Coefficient
1
*
*
µV/ºC/mV
OUTPUT ADJUSTMENT
POWER SUPPLY CURRENT (Note 2)
VRE117 ±PS
5
7
*
*
*
*
mA
VRE119 +PS
7
9
*
*
*
*
mA
VRE119 -PS
4
6
*
*
*
*
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
VRE117DS
VRE117/119
Product Innovation From
2. TYPICAL PERFORMANCE GRAPHS
VOUT vs. TEMPERATURE
0.46
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
0.4
0.4
-0.4
-0.4
-0.46
Temperature oC
VRE117M
Temperature oC
VRE117MA
Temperature oC
VRE119C
VRE117
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE119
POSITIVE OUTPUT
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
NEGATIVE OUTPUT
QUIESCENT CURRENT VS. TEMP
Temperature oC
VRE117DS
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
3
VRE117/119
Product Innovation From
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 noninverting input of the operational amplifier which amplifies the voltage to produce a 3 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.
To remove this residual error, a nonlinear compensation network of thermistors and resistors is used in the
VRE117/119 series references. This proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the slope, The VRE117/119 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.
4. APPLICATION INFORMATION
The proper connection of the VRE117 series voltage reference with the optional trim resistors is shown below. When
trimming the VRE119, 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 VRE117/119 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
1. Optional Fine Adjust for approximately ±5mV.
PIN CONFIGURATION
TOP VIEW
TOP VIEW
NC
FINE ADJ.
NC
+3.0V (-3.0V)
NC
FINE ADJ.
-PS
-3.0V
FINE -ADJ.
+3.0V
VRE119
FINE +ADJ.
+PS
+PS (-PS)
-PS
NC
NC
NC
REF. GND
NC
REF. GND
NC
GND
NC
NC
4
VRE117
FINE +ADJ.
FINE -ADJ.
GND
NC
VRE117DS
Product Innovation From
VRE117/119
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
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
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VRE117DS
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