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2.5 V Precision
Voltage Reference
REF03
FEATURES
2.5 voltage output, ±0.6% maximum
Wide input voltage range: 4.5 V to 33 V
Supply current: 1.4 mA maximum
Output voltage temperature coefficient: 50 ppm/°C
maximum
Line regulation: 50 ppm/V maximum
Load regulation: 100 ppm/mA maximum
Extended industrial temperature range: −40°C to +85°C
Low cost
PIN CONFIGURATION
NC
1
V
IN 2
8
NC
REF03
7
NC
TOP VIEW
V
TEMP 3
6
V
OUT
(Not to Scale)
GND
4
5
TRIM
NOTES
1. NC = NO CONNECT. DO NOT CONNECT ANYTHING
ON THESE PINS. SOME OF THEM ARE RESERVED
FOR FACTORY TESTING PURPOSES.
2. TRIM PIN AND V
TEMP
PIN SHOULD BE LEFT
FLOATING IF THEY ARE NOT BEING USED.
GENERAL DESCRIPTION
The REF03 precision voltage reference provides a stable 2.5 V
output, with minimal change for variations in supply voltage,
ambient temperature, or loading conditions. Single-supply
operation over an input voltage range of 4.5 V to 33 V with
a current drain of 1 mA and good temperature stability is
achieved using an improved band gap design. Primarily
targeted at price sensitive applications, the REF03 is available
in plastic PDIPs and surface-mount small outline plastic
packages. For improved performance or −40°C to +125°C
operation, see the
ADR03
data sheet.
Figure 1. 8-Lead PDIP (P-Suffix),
8-Lead SOIC (S-Suffix)
INPUT
R8
R7
R14
Q15
Q8
Q7
Q14
Q13
R15
2
Q9
Q12
Q11
C1
R6
R3
R4
Q10
Q6
Q5
R13
Q17
Q21
Q18
Q16
Q19
6
R12
16.7kΩ
R9
50kΩ
OUTPUT
Q4
Q1
R1
R2
R5
Q2
Q20
Q3
≈
1.23V
5
TRIM
R10
R11
2kΩ
GROUND
00372-002
4
Figure 2. Simplified Schematic
Rev. G
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
00372-001
REF03
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Pin Configuration............................................................................. 1
Revision History ............................................................................... 2
Electrical Specifications ................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Typical Performance Characteristics ............................................. 5
Applications........................................................................................7
Generating an Adjustable Bipolar Voltage Reference...............7
Generating a −2.5 V Reference....................................................7
Boost Transistor Provides High Output Current......................8
CMOS DAC Reference .................................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
REVISION HISTORY
6/07—Rev. F to Rev. G
Changes to Figure 1.......................................................................... 1
Changes to Applications Section .................................................... 7
Added Figure 15................................................................................ 7
Deleted Figure 21.............................................................................. 7
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide .......................................................... 10
6/04—Data Sheet changed from Rev. E to Rev. F
Updated Formatting ...........................................................Universal
Changes to Simplified Schematic ................................................... 1
Changes to Electrical Specifications .............................................. 3
Changes to Ordering Guide ............................................................ 8
2/04—Data Sheet changed from Rev. D to Rev. E
Changes to Simplified Schematic ....................................................1
Changes to Electrical Specifications ...............................................2
Changes to Ordering Guide .............................................................3
Replaced TPC 1 .................................................................................4
8/03—Data Sheet changed from Rev. C to Rev. D
Updated format...................................................................Universal
Changes to Features ..........................................................................1
Changes to General Description .....................................................1
Replaced Wafer Test Limits..............................................................2
Changes to Electrical Specifications ...............................................2
Changes to Ordering Guide .............................................................3
Added Outline Dimensions .............................................................7
Rev. G | Page 2 of 12
REF03
ELECTRICAL SPECIFICATIONS
@ V
IN
= 15 V, −40°C ≤ T
A
≤ +85°C, unless otherwise noted.
Table 1.
Parameter
Output Voltage
Output Voltage Tolerance
Output Voltage
Temperature Coefficient
1
Line Regulation
Load Regulation
Load Current (Sourcing)
Load Current (Sinking)
Short-Circuit Output Current
Quiescent Supply Current
Turn-On Settling Time
2
Output Voltage Noise
Output Adjustment Range
Input Voltage Range
Temperature Voltage Output
3
1
Symbol
V
O
Conditions
No load
No load
Min
2.485
REF03G
Typ
2.500
0.2
10
20
0.002
60
0.006
Max
2.515
0.6
50
50
0.005
100
0.010
Unit
V
%
ppm/°C
ppm/V
%/V
ppm/mA
%/mA
mA
mA
mA
mA
μs
μV p-p
%
V
mV
TCV
O
V
IN
= 4.5 V to 33 V
I
L
= 0 mA to 10 mA
I
L
I
S
I
SC
I
SY
t
ON
e
n
p-p
∆V
TRIM
V
T
10
−0.3
Output shorted to ground
No load
To ±0.1% of final value
0.1 Hz to 10 Hz
R
POT
= 10 kΩ
±6
4.5
−0.5
24
1.0
5
6
±11
15
620
1.4
33
TCV
O
is measured by the endpoint method, and is equal to
V
(
85
o
C
)
−
V
(
−
40
o
C
)
in ppm/
o
C
−
6
o
(
2.5
×
10
)(
125
C
)
Guaranteed by design.
Limit current in or out of Pin 3 to 50 nA and capacitance on Pin 3 to 30 pF.
2
3
+18V
+
10Ω
2
V
IN
10µF
V+
2
V
IN
V
OUT
6
V
OUT
10kΩ
REF03
GND
4
+
REF03
TRIM
GND
4
5
–18V
Figure 3. Burn-In Circuit
Figure 4. Output Voltage Trim Method
Rev. G | Page 3 of 12
00372-004
10µF
00372-003
REF03
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted. Absolute maximum
ratings apply to both DICE and packaged parts, unless
otherwise noted.
Table 2.
Parameter
Input Voltage
Output Short-Circuit Duration
Operating Temperature Range
REF03G (P-Suffix, S-Suffix)
Storage Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 10 sec)
Rating
40 V
Indefinite
−40°C to +85°C
−65°C to +175°C
−65°C to +175°C
300°C
Table 3. Package Thermal Resistance
Package Type
8-Lead PDIP (P-Suffix)
8-Lead SOIC (S-Suffix)
1
θ
JA1
110
160
θ
JC
50
44
Unit
°C/W
°C/W
θ
JA
is specified for worst-case mounting conditions, that is, θ
JA
is specified for
the device in socket for a PDIP package. θ
JA
is specified for the device
soldered to printed circuit board for a SOIC package.
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. G | Page 4 of 12
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