VRE4100 データシートの表示（PDF） - Unspecified
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VRE4100 Datasheet PDF : 7 Pages
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BASIC CIRCUIT CONNECTION
Figure 3 shows the proper connection of the
VRE4100 series voltage reference.
To achieve the specified performance, pay careful
attention to the layout. Commons should be
connected to a single point to minimize interconnect
resistances. This will reduce voltage errors, noise
pickup, and noise coupled from the power supply.
TEMPERATURE PERFORMANCE
The VRE4100 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 of 1ppm/°C makes it
possible to eliminate 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
(106 )
Vno minal (Tmax − Tmin )
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 or slope of the
device under test.
PIN DESCRIPTION
4
GND
2
Vin
3
Enable
1,5,7,8 NC
6
Vout
These must be connected to
ground
Positive power supply input
Pulled to Vin for normal
operation.
This pin must be left open
Reference output
+ VIN
Enable
6
2
VRE4100
3
1,5,7,8
4
+ VOUT
NC
COUT 1µF
Figure 2 External Connections
For example 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. Figure 3
shows the required reference TC vs. T change from
25°C for resolution ranging from 8 bits to 20 bits.
Figure 3
10000
Reference TC vs. T change from 25°C for 1 LSB change
1000
100
ReferenceTC
(ppm/°C)
10
1
0.1
0.01
1
8 BIT
10 BIT
12 BIT
14 BIT
16 BIT
18 BIT
20 BIT
10
100
VRE4100DS REV. A MAY 01
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