CIRRUS VRE310JS

VRE310
VRE310
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Precision Voltage Reference
Features
♦ +10 V Output, ±1.0 mV (.01%)
♦ Temperature Drift: 0.6 ppm/ºC
♦ Low Noise: 6 μVP-P (0.1-10Hz)
♦ Industry Standard Pinout: 8-pin DIP or Surface
Mount Package
♦ Excellent Line Regulation: 6 ppm/V Typical
♦ Output Trim Capability
Applications
The VRE310 is recommended for use as a reference for 14, 16, or 18-bit D/A converters which require an external precision reference. The device
is also ideal for calibrating scale factor on high
resolution A/D converters. The VRE310 offers superior performance over monolithic references.
DESCRIPTION
The VRE310 is a low cost, high precision +10 V reference. Available in an industry standard 8-pin DIP or
SMT, the device is ideal for upgrading systems that
use lower performance references.
The device provides ultrastable +10 V output with ±1.0
mV (.01%) initial accuracy and a temperature coefficient of 0.6 ppm/ºC. This improvement in accuracy is
made possible by a unique, patented 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 VRE310
series the most accurate reference available in a standard 8-pin DIP or SMT package.
For enhanced performance, the VRE310 has an external trim option for users who want less than 0.01% initial error. For ultra low noise applications, an external
capacitor can be attached between the noise reduction
pin and the ground pin. A reference ground pin is provided to eliminate socket contact resistance errors.
Figure 1. BLOCK DIAGRAM
Selection Guide
Model
Initial Error Temp. Coeff.
(mV)
(ppm/ºC)
VRE310AS
VRE310AD
VRE310BS
VRE310BD
VRE310CS
VRE310CD
VRE310JS
VRE310JD
VRE310DS
1.0
1.0
1.6
1.6
2.0
2.0
1.0
1.0
http://www.cirrus.com
0.6
0.6
1.0
1.0
2.0
2.0
0.6
0.6
Temp. Range
(ºC)
Package
Options
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
-40ºC to +85ºC
-40ºC to +85ºC
SMT8 (GD)
DIP8 (KD)
SMT8 (GD)
DIP8 (KD)
SMT8 (GD)
DIP8 (KD)
SMT8 (GD)
DIP8 (KD)
Copyright
© Cirrus
Logic, Inc. 2009
(All Rights Reserved)
8-pin Surface Mount
8-pin DIP
Package Style GD
Package Style KD
MAR 2009 APEX − VRE310DSREVE
VRE310
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 = +25ºC, RL = 10KΩ Unless Otherwise Noted.
Model
A/J
Parameter
Min
B
C
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
±15
±22
*
*
*
*
*
*
V
+70
*
*
*
*
ºC
ABSOLUTE MAXIMUM RATINGS
Power Supply
±13.5
Operating Temperature (A,B,C)
0
Operating Temperature (J)
-40
+85
*
*
*
*
ºC
Storage Temperature
-65
+150
*
*
*
*
ºC
Short Circuit Protection
Continuous
*
*
+10.0
*
*
V
630
*
*
mV
OUTPUT VOLTAGE
VRE310
Temp. Sensor Voltage (Note 1)
OUTPUT VOLTAGE ERRORS
Initial Error
(Note 2)
±1.0
Warmup Drift
±1.6
1
TMIN - TMAX
(Note3)
(Note 4)
mV
2.0
ppm/ºC
3
0.6
Long-Term Stability
Noise (0.1 - 10Hz)
2
±2.0
ppm
1.0
6
*
*
ppm/1000hrs.
6
*
*
µVpp
OUTPUT CURRENT
Range
±10
*
mA
REGULATION
Line
6
10
*
*
*
*
ppm/V
Load
3
*
*
ppm/mA
20
*
*
mV
OUTPUT ADJUSTMENT
Range
POWER SUPPLY CURRENT (Note 5)
VRE310 +PS
5
7
*
*
*
*
mA
NOTES:
* Same as A/J Models.
1. The temp. reference TC is 2.1 mV/ ºC
2. The specified values are without external trim.
3. The temperature coefficient is determined by the box method using the following formula:
VMAX – VMIN
T.C. =
x 106
VNOMINAL x (TMAX – TMIN)
4. The specified values are without the external noise reduction capacitor.
5. The specified values are unloaded.
VRE310DS
VRE310
P r o d u c t I n n o v a t i o nF r o m
2. TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE310A
Temperature oC
VRE310B
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE310C
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
VRE310DS
Temperature oC
VRE310J
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE310
P r o d u c t I n n o v a t i o nF r o m
3. THEORY OF OPERATION
The following discussion refers to the block diagram in Figure 1. In operation, approximately 6.3 V 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 6.3 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, a very stable voltage is produced 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.
The proper connection of the VRE310 series voltage references with the optional trim resistor is shown below. The
VRE310 reference has the ground terminal brought out on two pins (pin 4 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 4 to the power
supply ground and pin 7 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. Pay careful attention to the circuit layout to avoid noise pickup and voltage drops in the
lines.
EXTERNAL CONNECTIONS
+ VIN
V TEMP OUT
2
OPTIONAL
NOISE REDUCTION
CAPACITOR
CN
1µF
3
8
+ VOUT
6
VRE310
10kΩ
5
OPTIONAL
FINE TRIM
ADJUSTMENT
4
7
REF. GND
PIN CONFIGURATION
N/C
1
+VIN
2
TEMP
3
GND
4
VRE310
TOP
VIEW
8
NOISE
REDUCTION
7
REF. GND
6
VOUT
5
TRIM
VRE310DS
VRE310
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
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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VRE310DS