VRE3050 데이터 시트보기 (PDF) - Cirrus Logic
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VRE3050 Datasheet PDF : 6 Pages
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VRE3050
®
Product Innovation From
Figure 3.
10000
1000
100
8 BIT
10
10 BIT
12 BIT
1
14 BIT
16 BIT
0.1
18 BIT
0.01
1
20 BIT
10
100
Reference TC vs. ∆T change from 25°C for 1 LSB change
5. TEMPERATURE PERFORMANCE
The VRE3050 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 1 ppm/°C makes it possible to not perform a system temperature calibration, a slow and costly process.
Of the three TC specification methods (slope, butterfly, and box), the box method is most commonly used. A box
is formed by the min/max limits for the nominal output voltage over the operating temperature range. The equation
follows:
T.C. =
VMAX – VMIN
VNOMINAL x (TMAX – TMIN)
x 106
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 ppm/°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 volt-
age reference with a temperature coefficient of 0.5 ppm/°C. Figure 4 shows the required reference TC vs. delta T
change from 25°C for resolution ranging from 8 bits to 20 bits.
6. 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.
PIN CONFIGURATION
N/C 1
VRE3050
+VIN 2
N/C 3
TOP
VIEW
GND 4
8
NOISE
REDUCTION
7 N/C
6
VOUT
5 TRIM
6
VRE3050DS
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