CIRRUS VRE102C

VRE100/101/102
VRE100
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Precision Voltage Reference
Features
♦ Very High Accuracy: ±10 V Output, ±0.5 mV
♦ Extremely Low Drift: 0.5 ppm/ºC (-55ºC to
+125ºC)
♦ Low Warm-up Drift: 1.0 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
VRE100 Series Precision Voltage References provide
ultrastable +10 V (VRE100), -10 V (VRE101) and ±10
V (VRE102) outputs with ±0.5 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.
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 VRE100 series the most accurate
and stable 10 V reference available.
VRE100/101/102 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
VRE100
VRE102
VRE100DS
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
JUN 20091
APEX − VRE100DSREVF
VRE100
P r o d u c t I n n o v a t i o nF r o m
1. Characteristics and Specifications
ELECTRICAL Specifications
Vps =±15V, T = +25°C, RL = 10K Unless Otherwise Noted.
Grade
Parameter
C
Min
Typ
CA
Max
Min
±13.5
±22
Operating Temperature
-25
Storage Temperature
-65
Typ
M
Max
Min
*
*
+85
*
+150
*
Typ
MA
Max
Min
*
*
*
-55
*
*
Typ
Max
Units
*
*
V
+125
-55
+125
ºC
*
*
*
ºC
ABSOLUTE MAXIMUM RATINGS
Power Supply
Short Circuit Protection
Continuous
*
*
*
VRE100
+10
*
*
*
V
VRE101
-10
*
*
*
V
VRE102
±10
*
*
*
V
OUTPUT VOLTAGE
OUTPUT VOLTAGE ERRORS
Initial Error
±1.0
Warmup Drift
TMIN - TMAX
±0.5
2
(Note1)
±1.5
1
0.6
±0.8
2
0.3
1
1.0
mV
ppm
0.5
mV
Long-Term Stability
6
*
*
*
ppm/1000hrs.
Noise (0.1 - 10Hz)
6
*
*
*
µVpp
OUTPUT CURRENT
Range
±10
*
*
*
mA
REGULATION
Line
3
10
*
*
*
*
*
*
ppm/V
Load
3
*
*
*
ppm/mA
Range
20
*
*
*
mV
Temperature Coefficient
4
*
*
*
V/ºC/mV
OUTPUT ADJUSTMENT
POWER SUPPLY CURRENT (Note 2)
VRE100 +PS
5
7
*
*
*
*
*
*
mA
VRE101 -PS
5
7
*
*
*
*
*
*
mA
VRE102 +PS
7
9
*
*
*
*
*
*
mA
VRE102 -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
VRE100DS
VRE100
P r o d u c t I n n o v a t i o nF r o m
Selection Guide
Output (V)
Temperature
Operating Range
Volt Deviation (MAX)
VRE100C
VRE100CA
VRE100M
VRE100MA
+10
+10
+10
+10
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
±0.6mV
±0.3mV
±1.0mV
±0.5mV
VRE101C
VRE101CA
VRE101M
VRE100MA
-10
-10
-10
-10
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
±0.6mV
±0.3mV
±1.0mV
±0.5mV
VRE102C
VRE102CA
VRE102M
VRE102MA
±10
±10
±10
±10
-25°C to +85°C
-25°C to +85°C
-55°C to +125°C
-55°C to +125°C
±0.6mV
±0.3mV
±1.0mV
±0.5mV
Model
Hermetic 14-pin Ceramic DIP
Package Style HC
2. THEORY OF OPERATION
The following discussion refers to the block diagrams in Figure 1. 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 10.000 V output. The
gain is determined by the networks R1 and R2: G=1 + R2/R1. The 6.3 V 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.
A nonlinear compensation network of thermistors and resistors 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, this 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. By using highly stable resistors in our
network, we produce a voltage reference that also has very good long term stability.
3. APPLICATION INFORMATION
Page 5 shows the proper connection of the VRE100 series voltage reference with the optional trim resistors. When
trimming the VRE102, 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 VRE100 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. The VRE series voltage references can be connected with or
without the use of pin 6 and still provide superior performance.
VRE100DS
3
VRE100
P r o d u c t I n n o v a t i o nF r o m
4. TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE100/101/102C
Temperature oC
VRE100/101/102CA
Temperature oC
VRE100/101/102M
Temperature oC
VRE100/101/102MA
VRE100/101
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE102
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
4
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE100DS
VRE100
P r o d u c t I n n o v a t i o nF r o m
EXTERNAL CONNECTIONS
1. Optional Fine Adjust for approximately ±20mV. VRE101 center tap connects to -PS.
PIN CONFIGURATION
TOP VIEW
TOP VIEW
NC
NC
NC
NC
VRE100
NC
REF.
GND
GND
FINE
ADJ.
+10V
NC
FINE
ADJ.
NC
+PS
NC
NC
NC
NC
NC
FINE
ADJ.
NC
REF.
GND
GND
TOP VIEW
VRE101
-10V
FINE
ADJ.
-PS
-ADJ.
+ADJ.
-10V
+10V
-ADJ.
-PS
VRE102
+ADJ.
+PS
NC
NC
NC
REF.
GND
NC
NC
GND
NC
NC
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
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VRE100DS
5