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PDF VRE4100 Datasheet ( Hoja de datos )

Número de pieza VRE4100
Descripción Low Cost/ SOIC-8 Precision References
Fabricantes ETC 
Logotipo ETC Logotipo

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VRE4100 Hoja de datos, Descripción, Manual
VRE4100 Series
Low Cost, SOIC-8
Precision References
RHOPOINT COMPONENTS LTD • Tel: +44 (0) 1883 717988 • Fax: +44 (0) 1883 712938 • Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com
FEATURES
1.024, 1.250, 2.048, 2.500, 4.096V Output
Initial Error: ± 0.05% max.
Temperature Drift: 1.0 ppm/°C max.
Low Noise: 2.2µVp-p (0.1Hz-10Hz, 1.024V)
Low Thermal Hysterisis: 20ppm
±8mA Output Source
Power Down Mode
Industry Standard SOIC-8 pin out
Commercial and Industrial Temp Ranges
Second source for ADR29X, REF19X ,LT1460,
LT1461, LT1798, MAX616X, REF102
DESCRIPTION
The VRE4100 is a low cost, high precision
bandgap reference that operates from +5V. The
device features low noise, digital error correction,
and an SOIC-8 package. The ultrastable output
is 0.05% accurate with a temperature coefficient
as low as 1.0 ppm/°C. The improvement in
overall accuracy is made possible by using
EEPROM registers and CMOS DAC’s for
temperature and initial error correction. The DAC
trimming is done after assembly which eliminates
assembly related shifts.
The VRE4100 is recommended for use as a
reference for 14, 16, or 18 bit data converters
which require a precision reference. The
VRE4100 offers superior performance over
standard on-chip references commonly found
with data converters.
PIN CONFIGURATION
NC 1
VRE4100
+VIN 2
TOP
Enable 3
VIEW
GND 4
8 NC
7 NC
6 VREF
5 NC
FIGURE 1
SELECTION GUIDE
Model
VRE4110B
VRE4110C
VRE4110K
VRE4112B
VRE4112C
VRE4112K
VRE4120B
VRE4120C
VRE4120K
VRE4125B
VRE4125C
VRE4125K
VRE4141B
VRE4141C
VRE4141K
Output
Voltage
V
Temp.
Coeff.
ppm/°C
Temp.
Range °C
1.024
1.024
1.024
1.250
1.250
1.250
2.048
2.048
2.048
2.500
2.500
2.500
4.096
4.096
4.096
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
1.0 0°C to +70°C
2.0 0°C to +70°C
3.0 -40°C to +85°C
VRE4100DS REV. A MAY 01

1 page

VRE4100 pdf
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
ReferenceTC
(ppm/°C)
100
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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