2.5 V Precision
FEATURES
2.5 voltage output, ±0.6% max
Wide Input voltage range, 4.5 V to 33 V
Supply current 1.4 mA max
Output voltage tempco, 50 ppm/°C max
Line regulation, 50 ppm/V max
Load regulation, 100 ppm/mA max
Extended industrial temperature range, −40°C to +85°C
Low cost
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 mini DIPs and surface-mount small outline plastic
packages. For improved performance or −40°C to +125°C
operation, see the ADR03 data sheet.
Voltage Reference
PIN CONFIGURATION
1
NC
REF03
V
2
IN
V
TEMP
GND
NC = NO CONNECT. DO NOT CONNECT ANYTHING
ON THESE PINS. SOME OF THEM ARE RESERVED
FOR FACTORY TESTING PURPOSES.
TOP VIEW
3
(Not to Scale)
4
Figure 1. 8-Lead PDIP (P-Suffix),
8-Lead SOIC (S-Suffix)
NC
8
NC
7
V
6
OUT
TRIM
5
REF03
00372-F-001
INPUT
2
Q19
6
R12 = 16.7kΩ
5
4
OUTPUT
TRIM
GROUND
00372-F-002
R3
R1
R2
Q1
R5
C1
R4
Q2
R6
R8
Q8
Q4
Q6
Q20
R10
Q5
R7
Q7
Q9
Q3
Q14
Q10
R14
Q12
Q11
≈
1.23V
Figure 2. Simplified Schematic
Q17
Q13
Q15
R15
Q18
Q16
Q21
R13
R9 = 50kΩ
R11 = 2kΩ
Rev. F
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
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
www.analog.com
REF03
TABLE OF CONTENTS
Electrical Specifications................................................................... 3
Generating a −2.5 V Reference....................................................6
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Typical Performance Characteristics ............................................. 5
Applications....................................................................................... 6
Generating an Adjustable Bipolar Voltage Reference.............. 6
Boost Transistor Provides High Output Current......................6
CMOS DAC Reference.................................................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
REVISION HISTORY
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
Change to FEATURES.....................................................................................1
Change to GENERAL DESCRIPTION..........................................................1
Deleted WAFER TEST LIMITS.......................................................................2
Changes to ELECTRICAL SPECIFICATIONS.............................................2
Changes to ORDERING GUIDE....................................................................3
Added OUTLINE DIMENSIONS ...................................................................7
Revision 0: Initial Version
Rev. F | Page 2 of 8
REF03
()(
)
ELECTRICAL SPECIFICATIONS
@ VIN = 15 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 1.
REF03G
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage V
O
No Load 2.485 2.500 2.515 V
Output Voltage Tolerance No Load 0.2 0.6 %
Output Voltage
Temperature Coefficient
Line Regulation V
1
TCV
O
10 50 ppm/°C
= 4.5 V to 33 V 20 50 ppm/V
IN
0.002 0.005 %/V
Load Regulation IL = 0 mA to 10 mA 60 100 ppm/mA
0.006 0.010 %/mA
Load Current (Sourcing) I
Load Current (Sinking) I
Short-Circuit Output Current I
Quiescent Supply Current I
Turn-On Settling Time
2
L
S
SC
SY
t
ON
10 mA
−0.3 −0.5 mA
Output Shorted to Ground 24 mA
No Load 1.0 1.4 mA
To ±0.1% of Final Value 5 µs
Output Voltage Noise en p-p 0.1 Hz to 10 Hz 6 µV p-p
Output Adjustment Range ∆V
TRIM
R
= 10 kΩ ±6 ±11 %
POT
Input Voltage Range 4.5 15 33 V
Temperature Voltage Output
3
V
T
620 mV
1
TCVO is measured by the endpoint method, and is equal to
()
.
×
2
Guaranteed by design.
3
Limit current in or out of Pin 3 to 50 nA and capacitance on Pin 3 to 30 pF.
oo
C40VC85V
−−
6oo
−
C1251052
()
Figure 3. Burn-In Circuit
Cppmin
/
+18V
V
IN
REF03
GND
–18V
10Ω
2
4
+
+
10µF
10µF
V+
2
V
IN
6
V
OUT
REF03
00372-F-003
GND
TRIM
4
5
10kΩ
V
OUT
Figure 4. Output Voltage Trim Method
00372-F-004
Rev. F | Page 3 of 8