VRE4112 CIRRUS [Cirrus Logic], VRE4112 Datasheet - Page 5

• Manufacturer Part Number: VRE4112
• Description: Precision Voltage Reference
• Manufacturer: CIRRUS [Cirrus Logic]

. 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:
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
EXtERnAl connEctionS
VRE4100DS
+ V
1,5,7,8
4
2
3
6
Enable
IN
TC =
GND
V
Enable
NC
V
IN
OUT
V
NOMINAL
P r o d u c t I n n o v a t i o n F r o m
3
2
V
These must be connected to ground
Positive power supply input
Pulled to V
This pin must be left open
Reference output
MAX
VRE4112
VRE4125
VRE4141
x (T
– V
4
MAX
MIN
– T
IN
1,5,7,8
for nominal operation
6
MIN
)
x 10
6
NC
+ V
OUT
C
OUT
1µF
VRE4100