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PDF VRE3021 Datasheet ( Hoja de datos )

Número de pieza VRE3021
Descripción Low Cost Precision Reference
Fabricantes ETC 
Logotipo ETC Logotipo

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VRE3021 Hoja de datos, Descripción, Manual
www.DataSheet4U.com
VRE3021
Low Cost
Precision Reference
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
2.048 V Output ± 0.205 mV (.01%)
Temperature Drift: 0.6 ppm/°C
Low Noise: 1.5 µV p-p (0.1Hz-10Hz)
Low Thermal Hysteresis: 1 ppm Typ.
±15mA Output Source and Sink Current
Excellent Line Regulation: 5 ppm/V Typ.
Optional Noise Reduction and Voltage Trim
Industry Standard Pinout
PIN CONFIGURATION
N/C 1
VRE3021
+VIN 2
N/C 3
TOP
VIEW
GND 4
8
NOISE
REDUCTION
7 N/C
6 VOUT
5 TRIM
FIGURE 1
DESCRIPTION
DataSheet4U.com
DataShee
The VRE3021 is a low cost, high precision 2.048V
reference that operates from +10V. The device
features a buried zener for low noise and excellent
long term stability. Packaged in an 8 pin DIP and
SMT, the device is ideal for high resolution data
conversion systems.
The device provides ultrastable +2.048V output
with ±0.2048 mV (.01%) initial accuracy and a
temperature coefficient of 0.6 ppm/°C. This
improvement in accuracy is made possible by a
unique, patented multipoint laser compensation
technique developed by Thaler Corporation.
Significant improvements have been made in
other performance parameters as well, including
initial accuracy, warm-up drift, line regulation, and
long-term stability, making the VRE3021 series
the most accurate reference available.
For enhanced performance, the VRE3021 has an
external trim option for users who want less than
0.01% initial error. For ultra low noise
applications, an external capacitor can be
attached between the noise reduction pin and the
ground pin.
DataSheet4U.com
The VRE3021 is recommended for use as a
reference for 14, 16, or 18 bit data converters
which require an external precision reference.
The device is also ideal for calibrating scale factor
on high resolution data converters. The VRE3021
offers superior performance over monolithic
references.
SELECTION GUIDE
Model
VRE3021A
VRE3021B
VRE3021C
VRE3021J
VRE3021K
VRE3021L
Initial
Error
mV
0.205
0.307
0.410
0.205
0.307
0.410
Temp.
Coeff.
ppm/°C
0.6
1.0
2.0
0.6
1.0
2.0
Temp.
Range °C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
For package option add D for DIP or S for Surface Mount
to end of model number.
VRE3021DS REV. D JULY 2000

1 page

VRE3021 pdf
www.DataSheet4U.com
THEORY OF OPERATION
The following discussion refers to the schematic in
figure 2 below. A FET current source is used to bias a
6.3V zener diode. The zener voltage is divided by the
resistor network R1 and R2. This voltage is then applied
to the noninverting input of the operational amplifier which
amplifies the voltage to produce a 2.048V output. The
gain is determined by the resistor networks R3 and R4:
G=1 + R4/R3. The 6.3V zener diode is used because it is
the most stable diode over time and temperature.
82
R1
R2
+
6
-
R4
5
R3
4
BASIC CIRCUIT CONNECTION
Figure 3 shows the proper connection of the VRE3025
voltage reference with the optional trim resistor for initial
error and optional capacitor for noise reduction.
CN 1µF
Optional Noise
Reduction
Capacitor
+ VIN
2
8
VRE3021
6
5
4
+ VOUT
10k
Optional Fine
Trim Adjustment
Figure 3 External Connections
To achieve the specified performance, pay careful
attention to the layout. A low resistance star configuration
will reduce voltage errors, noise pickup, and noise
coupled from the power supply. Commons should be
connected to a single point to minimize interconnect
resistances.
et4U.com
Figure 2 Functional Block Diagram
The current source provides a closely regulated zener
current, which determines the slope of the references’
voltage vs. temperature function. By trimming theDazetanSerheet4U.com
current a lower drift over temperature can be achieved.
But since the voltage vs. temperature function is nonlinear
this compensation technique is not well suited for wide
temperature ranges.
Thaler Corporation has developed a nonlinear
compensation network of thermistors and resistors that is
used in the VRE series voltage references. This
proprietary network eliminates most of the nonlinearity in
the voltage vs. temperature function. By adjusting the
slope, Thaler Corporation produces a very stable voltage
over wide temperature ranges.
This network is less than 2% of the overall network
resistance so it has a negligible effect on long term
stability. Figure 3 shows the proper connection of the
VRE3021 series voltage references with the optional trim
resistor for initial error and the optional capacitor for noise
reduction.
PIN DESCRIPTION
1,3,7
2
4
5
6
DataSheet4U.com8
N.C.
Vin
GND
TRIM
OUT
NR
Internally connected. Do not use
Positive power supply input
Ground
External trim input. Leave open if
not used.
Voltage reference output
Noise Reduction
DataShee
VRE3021DS REV. D JULY 2000

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