CIRRUS VRE410L

VRE410
VRE410
P r o d u c t IInnnnoovvaa t i o n FFr roomm
Precision Dual Voltage Reference
Features
♦ ±10 V Output, ± 1.0 mV (.01%)
♦ Temperature Drift: 0.6 ppm/ºC
♦ Low Noise: 6 μVP-P (0.1-10Hz)
♦ Tracking Error: 0.5 mV Max.
♦ Excellent Line Regulation: 6 ppm/V Typical
♦ Surface Mount Package
Applications
The VRE410 is recommended for use as a reference for high precision D/A and A/D converters
which require an external precision reference.
The device is also ideal for calibrating scale factor
on high resolution A/D converters. The VRE410
offers superior performance over monolithic references.
DESCRIPTION
The VRE410 is a low cost, high precision, ±10 V reference. Available in a 14-pin SMT package, the device
is ideal for new designs that need a high performance
reference.
The device provides ultrastable ±10 V output with ±1.0
mV (.01%) initial accuracy and a temperature coefficient of 0.6 ppm/°C. This improvement in accuracy is
made possible by a unique, patented multipoint laser
compensation technique.
Another key feature of this reference is the 0.5 mV
maximum tracking error between the positive and negative output voltages over the full operating temperature range. This is extremely important in high performance systems for reducing overall system errors.
Figure 1. BLOCK DIAGRAM
Selection Guide
Model
VRE410A
VRE410B
VRE410C
VRE410J
VRE410L
VRE410DS
Initial Error Temp. Coeff.
(mV)
(ppm/ºC)
±1.0
±1.6
±2.0
±1.0
±2.0
http://www.cirrus.com
0.6
1.0
2.0
0.6
2.0
Temp. Range
(ºC)
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
-40ºC to +85ºC
-40ºC to +85ºC
Copyright
© Cirrus
Logic, Inc. 2009
(All Rights Reserved)
14-pin Surface Mount
Package Style GE
MAR 2009 APEX − VRE410DSREVB
VRE410
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
B
C/L
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
±13.5
±15
±22
*
*
*
*
*
*
V
+70
*
*
*
*
ºC
ABSOLUTE RATINGS
Power Supply
Operating Temperature (A,B,C)
0
Operating Temperature (J,L)
-40
+85
*
*
*
*
ºC
Storage Temperature
-65
+150
*
*
*
*
ºC
Short Circuit Protection
Continuous
*
*
±10.0
*
*
OUTPUT VOLTAGE
VRE410
V
OUTPUT VOLTAGE ERRORS
Initial Error
(Note 1)
±1.00
Warmup Drift
±1.60
1
±2.00
2
3
mV
ppm
TMIN - TMAX
(Note 2)
0.6
1.0
2.0
ppm/ºC
Tracking Error
(Note 3)
0.5
0.7
1.0
mV
Long-Term Stability
6
*
*
ppm/1000hrs.
Noise (0.1 - 10Hz)
6
*
*
µVpp
OUTPUT CURRENT
Range
±10
*
mA
REGULATION
Line
3
Load
3
10
*
*
*
*
*
*
ppm/V
ppm/mA
POWER SUPPLY CURRENT (Note 4)
+PS
7
9
*
*
*
*
mA
-PS
4
6
*
*
*
*
mA
NOTES:
* Same as A/J Models.
1. The specified values are without external trim.
2. The temperature coefficient (TC) is determined
by the box method using the following formula:
VMAX – VMIN
T.C. =
x 106
VNOMINAL x (TMAX – TMIN)
4. The tracking error is the deviation between the
positive and negative output over the operating
temp. range.
5. The specified values are unloaded.
VRE410DS
VRE410
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
VOUT vs. TEMPERATURE
Temperature oC
VRE410A
Temperature oC
VRE410B
Temperature oC
VRE410C
VOUT vs. TEMPERATURE
VOUT vs. TEMPERATURE
Temperature oC
VRE410J
Temperature oC
VRE410L
POSITIVE OUTPUT (TYP)
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
NEGATIVE OUTPUT (TYP)
QUIESCENT CURRENT VS. TEMP
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Temperature oC
VRE410DS
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
VRE410
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.
The VRE400 series voltage references have the ground terminal brought out on two pins (pin 6 and 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.
PIN CONFIGURATION
N/C
1
14
N/C
VOUT
2
13
+VOUT
N/C
3
VRE410
12
N/C
- VIN
4
11
+VIN
N/C
5
TOP
VIEW
10
N/C
REF. GND
6
9
N/C
GND
7
8
N/C
-
VRE410DS
VRE410
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
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VRE410DS