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REF01 View Datasheet(PDF) - Analog Devices

Part NameREF01 ADI
Analog Devices ADI
DescriptionVoltage Reference
REF01 Datasheet PDF : 20 Pages
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BIPOLAR VOLTAGE REFERENCE
Many applications require both a positive and reference voltage
of the same magnitude. A simple method of generating such a
bipolar reference is shown in Figure 42.
V+
U1 2
VIN
6
VOUT
REF03
100k
+2.5V
GND
4
100k
U2
2
7
OP97 6
3
4
–2.5V
V–
Figure 42. Bipolar Voltage Reference
In this configuration, the negative rail is generated simply
with an inverting amplifier with a gain of −1. A low offset
op amp should be used to minimize the voltage error at the
negative output.
REF01/REF02/REF03
ADJUSTABLE REFERENCE WITH POSITIVE AND
NEGATIVE SWING
The output voltage of the REF0x references can be readily
adjusted via a simple trim circuit (explained in the Output
Adjustment section). The circuit shown in Figure 43 extends
the negative range of adjustment beyond that obtainable with
the simple trim circuit by employing a precision op amp with
a potentiometer feeding the op amp’s noninverting input.
V+
U1 2
VIN
6
VOUT
REF03
50k
GND
4
50k
50k
2
+15V
7
OP97 6
3
U2
4
V+
VOUT
–2.5V TO +2.5V
Figure 43. Negatively Adjustable Reference
The voltage output from the op amp can be adjusted by
changing the value of the potentiometer: as shown, the op
amp outputs +2.5 V when the pot is pulled completely high,
and −2.5V when pulled completely low. In this configuration,
the load current is sourced by the op amp; therefore, a low
offset op amp with a current rating that meets or exceeds the
current requirements of the load should be used.
Rev. K | Page 17 of 20
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GENERAL DESCRIPTION
The REF0x series of precision voltage references provide a stable 10.0 V, 5.0 V, or 2.5 V output with minimal change in response to variations in supply voltage, ambient temperature or load conditions. The parts are available in 8-lead SOIC, PDIP, CERDIP, and TO-99 packages, as well as 20-terminal LCC packages (883 only), furthering the parts’ usability in both standard and high stress applications.

FEATURES
High output accuracy
REF01: 10.0 V, ±0.3% maximum
REF02: 5.0 V, ±0.3% maximum
REF03: 2.5 V, ±0.6% maximum
Adjustable output: ± 3% minimum
Excellent temperature stability
REF01: 8.5 ppm/°C maximum
REF02: 8.5 ppm/°C maximum
REF03: 50 ppm/°C maximum
Low noise
REF01: 30 μV p-p typical
REF02: 15 μV p-p typical
REF03: 6 μV p-p typical
High supply voltage range: up to 36 V maximum
Low supply current: 1.4 mA maximum
High load-driving capability: 10 mA maximum
Temperature output function
APPLICATIONS
Precision data systems
High resolution converters
Industrial process control systems
Precision instruments
Military and aerospace applications

Part Number  Output Voltage  Input Voltage Range
REF01               10.0 V             12 V to 36 V
REF02               5.0 V              7.0 V to 36 V
REF03              2.5 V               4.5 V to 36 V

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