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Precision Micropower,
Low Dropout Voltage References
REF19x Series
FEATURES
Temperature coefficient: 5 ppm/°C maximum
High output current: 30 mA
Low supply current: 45 μA maximum
Initial accuracy: ±2 mV maximum
1
Sleep mode: 15 μA maximum
Low dropout voltage
Load regulation: 4 ppm/mA
Line regulation: 4 ppm/V
Short-circuit protection
TEST PINS
Test Pin 1 and Test Pin 5 are reserved for in-package Zener zap.
To achieve the highest level of accuracy at the output, the Zener
zapping technique is used to trim the output voltage. Because
each unit may require a different amount of adjustment, the
resistance value at the test pins varies widely from pin to pin
and from part to part. The user should leave Pin 1 and Pin 5
unconnected.
TP
1
V
S 2
SLEEP
3
REF19x
SERIES
8
7
NC
NC
APPLICATIONS
Portable instruments
ADCs and DACs
Smart sensors
Solar powered applications
Loop-current-powered instruments
6
OUTPUT
TOP VIEW
(Not to Scale)
5
TP
GND
4
Figure 1. 8-Lead SOIC_N and TSSOP Pin Configuration
(S Suffix and RU Suffix)
TP
1
GENERAL DESCRIPTION
The REF19x series precision band gap voltage references use a
patented temperature drift curvature correction circuit and
laser trimming of highly stable, thin-film resistors to achieve a
very low temperature coefficient and high initial accuracy.
The REF19x series is made up of micropower, low dropout
voltage (LDV) devices, providing stable output voltage from
supplies as low as 100 mV above the output voltage and
consuming less than 45 μA of supply current. In sleep mode,
which is enabled by applying a low TTL or CMOS level to the
SLEEP pin, the output is turned off and supply current is
further reduced to less than 15 μA.
The REF19x series references are specified over the extended
industrial temperature range (−40°C to +85°C) with typical
performance specifications over −40°C to +125°C for
applications, such as automotive.
All electrical grades are available in an 8-lead SOIC package; the
PDIP and TSSOP packages are available only in the lowest
electrical grade.
1
V
S 2
SLEEP
3
REF19x
SERIES
8
7
NC
NC
6
OUTPUT
TOP VIEW
GND
4
(Not to Scale)
5
TP
Figure 2. 8-Lead PDIP Pin Configuration
(P Suffix)
Table 1. Nominal Output Voltage
Part Number
REF191
REF192
REF193
REF194
REF195
REF196
REF198
Nominal Output Voltage (V)
2.048
2.50
3.00
4.50
5.00
3.30
4.096
Initial accuracy does not include shift due to solder heat effect (see the
Applications Information section).
Rev. K
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 ©1996–2010 Analog Devices, Inc. All rights reserved.
00371-002
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
00371-001
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
REF19x Series
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Test Pins ............................................................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Electrical Characteristics—REF191 @ T
A
= 25°C .................... 4
Electrical Characteristics—REF191 @ −40°C ≤ +85°C ........... 5
Electrical Characteristics—REF191 @
−40°C ≤ T
A
≤ +125°C................................................................... 6
Electrical Characteristics—REF192 @ T
A
= 25°C .................... 6
Electrical Characteristics—REF192 @ −40°C ≤ T
A
≤ +85°C
......................................................................................................... 7
Electrical Characteristics—REF192 @ −40°C ≤ T
A
≤ +125°C
......................................................................................................... 7
Electrical Characteristics—REF193 @ T
A
= 25°C .................... 8
Electrical Characteristics—REF193 @ −40°C ≤ T
A
≤ +85°C
......................................................................................................... 8
Electrical Characteristics—REF193 @ T
A
≤ −40°C ≤ +125°C
......................................................................................................... 9
Electrical Characteristics—REF194 @ T
A
= 25°C .................... 9
Electrical Characteristics—REF194 @ −40°C ≤ T
A
≤ +85°C
....................................................................................................... 10
Electrical Characteristics—REF194 @ −40°C ≤ T
A
≤ +125°C
....................................................................................................... 10
Electrical Characteristics—REF195 @ T
A
= 25°C .................. 11
Electrical Characteristics—REF195 @ −40°C ≤ T
A
≤ +85°C
....................................................................................................... 11
Electrical Characteristics—REF195 @ −40°C ≤ T
A
≤ +125°C
....................................................................................................... 12
Electrical Characteristics—REF196 @ T
A
= 25°C .................. 12
Electrical Characteristics—REF196 @ −40°C ≤ T
A
≤ +85°C
....................................................................................................... 13
Electrical Characteristics—REF196 @ −40°C ≤ T
A
≤ +125°C
....................................................................................................... 13
Electrical Characteristics—REF198 @ T
A
= 25°C .................. 14
Electrical Characteristics—REF198 @ −40°C ≤ T
A
≤ +85°C
....................................................................................................... 14
Electrical Characteristics—REF198 @ −40°C ≤ T
A
≤
+125°C
....................................................................................................... 15
Absolute Maximum Ratings ......................................................... 16
Thermal Resistance .................................................................... 16
ESD Caution................................................................................ 16
Typical Performance Characteristics ........................................... 17
Applications Information .............................................................. 20
Output Short-Circuit Behavior ................................................ 20
Device Power Dissipation Considerations .............................. 20
Output Voltage Bypassing ......................................................... 20
Sleep Mode Operation ............................................................... 20
Basic Voltage Reference Connections ..................................... 20
Membrane Switch-Controlled Power Supply............................. 20
Solder Hear Effect ...................................................................... 21
Current-Boosted References with Current Limiting ............. 21
Negative Precision Reference Without Precision Resistors .. 22
Stacking Reference ICs for Arbitrary Outputs ....................... 22
Precision Current Source .......................................................... 23
Switched Output 5 V/3.3 V Reference ..................................... 23
Kelvin Connections .................................................................... 24
Fail-Safe 5 V Reference .............................................................. 24
Low Power, Strain Gage Circuit ............................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
Rev. K | Page 2 of 28
REF19x Series
REVISION HISTORY
7/10—Rev. J to Rev. K
Add Note 1, Features Section........................................................... 1
Changes to Note 1, Table 2 ............................................................... 4
Changes to Note 1, Table 5 ............................................................... 6
Changes to Note 1, Table 8 ............................................................... 8
Changes to Note 1, Table 11 ............................................................. 9
Changes to Note 1, Table 14 ...........................................................11
Changes to Note 1, Table 17 ...........................................................12
Changes to Note 1, Table 20...........................................................14
Moved Figure 22 ..............................................................................20
Added Figure 23, Solder Heat Effect Section, and Figure 24;
Renumbered Sequentially ..............................................................21
Moved Negative Precision Reference Without Precision
Resistors Section ..............................................................................22
Moved Precision Current Source Section ....................................23
Moved Kelvin Connections Section .............................................24
Moved Figure 32 ..............................................................................25
Updated Outline Dimensions ........................................................26
Changes to Ordering Guide ...........................................................27
3/08—Rev. I to Rev. J
Changes to General Description ..................................................... 1
Changes to Specifications Section................................................... 4
Deleted Wafer Test Limits Section ................................................14
Changes to Table 23, Thermal Resistance Section, and
Table 24 .............................................................................................16
Changes to Figure 6.........................................................................17
Changes to Device Power Dissipation
Considerations Section ...................................................................20
Changes to Current-Boosted References with Current
Limiting Section ..............................................................................21
Changes to Precision Current Source Section.............................22
Changes to Figure 28 ......................................................................23
Changes to Figure 30 ......................................................................24
Changes to Low Power, Strain Gage Circuit Section ..................25
Changes to Ordering Guide ...........................................................27
9/06—Rev. H to Rev. I
Updated Format.................................................................. Universal
Changes to Table 25 ........................................................................16
Changes to Figure 6.........................................................................16
Changes to Figure 10, Figure 12, Figure 14, and Figure 26 .......17
Changes to Figure 18 ......................................................................18
Changes to Figure 20 ......................................................................19
Changes to Figure 23 ......................................................................20
Changes to Figure 25 ......................................................................21
Updated Outline Dimensions ........................................................25
Changes to Ordering Guide ...........................................................26
6/05—Rev. G to Rev. H
Updated Format ................................................................. Universal
Changes to Caption in Figure 7..................................................... 16
Updated Outline Dimensions........................................................ 25
Changes to Ordering Guide ........................................................... 26
7/04—Rev. F to Rev. G
Changes to Ordering Guide ............................................................. 4
3/04—Rev. E to Rev. F
Updated Absolute Maximum Rating.............................................. 4
Changes to Ordering Guide ........................................................... 14
Updated Outline Dimensions........................................................ 24
1/03—Rev. D to Rev. E
Changes to Figure 3 and Figure 4 ................................................. 15
Changes to Output Short Circuit Behavior ................................. 17
Changes to Figure 20 ...................................................................... 17
Changes to Figure 26 ...................................................................... 19
Updated Outline Dimensions........................................................ 23
1/96—Revision 0: Initial Version
Rev. K | Page 3 of 28
REF19x Series
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—REF191 @ T
A
= 25°C
@ V
S
= 3.3 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INITIAL ACCURACY
1
E Grade
F Grade
G Grade
LINE REGULATION
2
E Grade
F and G Grades
LOAD REGULATION
2
E Grade
F and G Grades
DROPOUT VOLTAGE
Symbol
V
O
Condition
I
OUT
= 0 mA
Min
2.046
2.043
2.038
Typ
2.048
Max
2.050
2.053
2.058
4
8
10
15
0.95
1.25
1.55
Unit
V
V
V
ppm/V
ppm/V
ppm/mA
ppm/mA
V
V
V
mV
μV p-p
ΔV
O
/ΔV
IN
3.0 V ≤ V
S
≤ 15 V, I
OUT
= 0 mA
ΔV
O
/ΔV
LOAD
V
S
= 5.0 V, 0 mA ≤ I
OUT
≤ 30 mA
V
S
− V
O
V
S
= 3.15 V, I
LOAD
= 2 mA
V
S
= 3.3 V, I
LOAD
= 10 mA
V
S
= 3.6 V, I
LOAD
= 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
4
6
2
4
LONG-TERM STABILITY
3
NOISE VOLTAGE
1
2
DV
O
e
N
1.2
20
Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
Line and load regulation specifications include the effect of self-heating.
3
Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
Rev. K | Page 4 of 28
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