CIRRUS VRE210C

VRE210
VRE210
P r o VRE210
duct Innovation From
Precision Voltage Reference
FEATURES
♦ Very High Accuracy: +10 V Output, ±0.5 mV
♦ Extremely Low Drift: 0.6 ppm/ºC (-55ºC to
+125ºC)
♦ Low Warm-up Drift: 1 ppm Typical
♦ Excellent Stability: 6 ppm/1000 Hrs. Typical
♦ Excellent Line Regulation: 3 ppm/V Typical
♦ Hermetic 20-terminal Ceramic LCC Package
♦ 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
VRE210 Series Precision Voltage References provide
ultrastable +10 V outputs with ±0.5 mV initial accuracy
and temperature coefficient as low as 0.6 ppm/ºC 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, warmup drift, line regulation, and long term stability, making
the VRE210 series the most accurate and stable 10 V
surface mount references available.
VRE210 devices are available in two operating temperature ranges, -25ºC to +85ºC and -55ºC to +125ºC,
and two electrical performance grades. All devices
are packaged in 20-terminal ceramic LCC packages
for maximum long-term stability. “M” versions are
screened for high reliability and quality.
Figure 1. BLOCK DIAGRAM
11
SELECTION GUIDE
Output (V)
Temperature
Operating Range
Volt Deviation
(Max)
VRE210C
VRE210CA
+10
+10
-25ºC to +85ºC
-25ºC to +85ºC
±0.8mV
±0.6mV
VRE210M
VRE210MA
+10
+10
-55ºC to +125ºC
-55ºC to +125ºC
±1.2mV
±1.0mV
Model
VRE210DS
www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
20-terminal Ceramic LCC
Package Style HD
NOV 20091
APEX − VRE210DSREVH
VRE210
Product Innovation From
1. CHARACTERISTICS AND SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VPS =+15V, T = +25ºC, RL = 10KΩ Unless Otherwise Noted.
Model
VRE210C
Parameter
Min
Typ
VRE210CA
Max
Min
+22
Typ
VRE210M
Max
Min
*
*
Typ
VRE210MA
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
*
*
*
+10
*
*
*
OUTPUT VOLTAGE
VRE210
V
OUTPUT VOLTAGE ERRORS
Initial Error
±700
Warmup Drift
TMIN - TMAX
±500
2
(Note1)
±1000
1
800
±800
2
600
1
1200
µV
ppm
1000
µV
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
*
*
*
mV/ºC/mV
OUTPUT ADJUSTMENT
POWER SUPPLY CURRENT (Note 2)
VRE210 +PS
5
7
*
*
*
*
*
*
mA
NOTES:
* Same as C Models.
1. Using the box method, the specified value is the maximum deviation from the output voltage at 25ºC
over the specified operating temperature range.
2. The specified values are unloaded.
2
VRE210DS
VRE210
Product Innovation From
2. TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
1.2
0.8
1.0
0.6
-0.6
-0.8
-1.0
-1.2
Temperature oC
VRE210C
Temperature oC
VRE210CA
Temperature oC
VRE210M
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
Output Current (mA)
Temperature oC
VRE210MA
PSRR VS. FREQUENCY
Frequency (Hz)
3. THEORY OF OPERATION
The following discussion refers to the block diagram 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 V 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.
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. 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.
VRE210DS
3
VRE210
Product Innovation From
4. APPLICATION INFORMATION
The proper connection of the VRE210 series voltage references with the optional trim resistor is shown below. Pay
careful attention to the circuit layout to avoid noise pickup and voltage drops in the lines.
The VRE210 series voltage references have the ground terminal brought out on two pins (pin 9 and pin 10) 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 10 to the power supply ground and pin 9 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 does not effect performance.
PIN CONFIGURATION
EXTERNAL CONNECTIONS
3
2
1
20
4
+15V
5
17
6
16
7
15
8
Ref. Gnd.
9 10
11
NC NC NC VOUT NC
19
18
12 13
18 17 16 15 14
13 NC
NC 19
NC 20
VOUT = +10V
14
10KΩ
NC
1
NC
2
NC
3
12 NC
TOP VIEW
VRE210
11 TRIM
10 GND
Δ
4
9
5
NC VIN
6
7
REF GND
8
NC 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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VRE210DS