VRE4100 Просмотр технического описания (PDF) - Cirrus Logic
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VRE4100 Datasheet PDF : 8 Pages
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VRE4100
3. TEMPERATURE PERFORMANCE
This series 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/ºC 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:
TC =
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
or slope of the device under test.
4. BASIC CIRCUIT CONNECTION
The proper connection for the VRE4112/VRE4125/VRE4141 series voltage references is shown below.
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.
PIN DESCRIPTION
4
GND These must be connected to ground
2
3
1,5,7,8
VIN
Enable
NC
Positive power supply input
Pulled to VIN for nominal operation
This pin must be left open
6
VOUT
Reference output
EXTERNAL CONNECTIONS
+ VIN
Enable
2
VRE4112
VRE4125
6
VRE4141
3
1,5,7,8
+ VOUT
NC
COUT 1µF
4
VRE4100DS
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