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參數(shù)資料
| 型號： | VRE3041CS |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | THREE TERM VOLTAGE REFERENCE, PDSO8 |
| 封裝： | SMT-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 187K |
| 代理商： | VRE3041CS |
VRE3041DS REV. D JULY 2000
TEMPERATURE PERFORMANCE
The VRE3041 is designed for applications where the
initial
error
at
room
temperature
and
drift
over
temperature are important to the user.
For many
instrument manufacturers, a voltage reference with a
temperature coefficient less than 1ppm/
°C makes it
possible to not have to perform a system temperature
calibration, a slow and costly process.
Of the three TC specification methods (slope, butterfly,
and box), the box method is used commonly used. A box
is formed by the min/max limits for the nominal output
voltage over the operating temperature range.
The
equation follows:
This method corresponds more accurately to the
method of test and provides a closer estimate of actual
error than the other methods.
The box method
guarantees limits for the temperature error but does not
specify the exact shape and slope of the device under
test.
A
designer
who
needs
a
14-bit
accurate
data
acquisition system over the industrial temperature range
(-40
°C to +85°C), will need a voltage reference with a
temperature coefficient (TC) of 1.0ppm/
°C if the reference
is allowed to contribute an error equivalent to 1LSB. For
1/2LSB equivalent error from the reference you would
need a voltage reference with a temperature coefficient of
0.5ppm/
°C. Figure 4 shows the required reference TC vs.
delta T change from 25
°C for resolution ranging from 8
bits to 20 bits.
THERMAL HYSTERISIS
A change in output voltage as a result of a temperature
change.
When references experience a temperature
change and return to the initial temperature, they do not
always have the same initial voltage. Thermal hysterisis
is difficult to correct and is a major error source in
systems that experience temperature changes greater
than 25
°C. Reference vendors are starting to include this
important specification in their datasheets.
(
)
6
min
max
nominal
min
max
10
.
=
T
V
C
T
0.01
0.1
1
10
100
1000
10000
1
10
100
20 BIT
18 BIT
16 BIT
14 BIT
12 BIT
10 BIT
8 BIT
ReferenceTC
(ppm/
°C)
Reference TC vs.
T change from 25°C for 1 LSB change
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