Precision Micropower, Low Dropout
Voltage References
REF19x Series
FEATURES
Initial accuracy: ±2 mV maximum
Temperature coefficient: 5 ppm/°C maximum
Low supply current: 45 μA maximum
Sleep mode: 15 μA maximum
Low dropout voltage
Load regulation: 4 ppm/mA
Line regulation: 4 ppm/V
High output current: 30 mA
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. Since 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
APPLICATIONS
Portable instruments
ADCs and DACs
Smart sensors
Solar-powered applications
Loop current-powered instruments
REF19x
SERIES
8
7
NC
NC
6
OUTPUT
TOP VIEW
GND
4
(Not to Scale)
5
TP
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_N package;
the PDIP and TSSOP packages are available only in the lowest
electrical grade. Products are also available in die form.
Figure 1. 8-Lead SOIC_N and TSSOP Pin Configuration
(S Suffix and RU Suffix)
TP
1
V
S 2
SLEEP
3
OUTPUT
TOP VIEW
GND
4
(Not to Scale)
5
TP
6
REF19x
SERIES
8
7
NC
NC
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
Rev. I
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
©2006 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
Specifications..................................................................................... 3
Electrical Characteristics—REF191 @ T
A
= 25°C .................... 3
Electrical Characteristics—REF191 @ −40°C ≤ T
A
≤ +85°C .. 4
Electrical Characteristics—REF191 @ −40°C ≤ T
A
≤+125°C. 5
Electrical Characteristics—REF192 @ T
A
= 25°C .................... 5
Electrical Characteristics—REF192 @ −40°C ≤ T
A
≤ +85°C.. 6
Electrical Characteristics—REF192 @ −40°C ≤ T
A
≤ +125°C 6
Electrical Characteristics—REF193 @ T
A
= 25°C .................... 7
Electrical Characteristics—REF193 @ −40°C ≤ T
A
≤ +85°C.. 7
Electrical Characteristics—REF193 @ T
A
≤ −40°C ≤ +125°C 8
Electrical Characteristics—REF194 @ T
a
= 25°C..................... 8
Electrical Characteristics—REF194 @ −40°C ≤ T
A
≤ +85°C.. 9
Electrical Characteristics—REF194 @ −40°C ≤ T
A
≤ +125°C 9
Electrical Characteristics—REF195 @ T
A
= 25°C .................. 10
Electrical Characteristics—REF195 @ −40°C ≤ T
A
≤ +85°C 10
Electrical Characteristics—REF195 @ −40°C ≤ T
A
≤ +125°C
....................................................................................................... 11
Electrical Characteristics—REF196 @ T
A
= 25°C .................. 11
Electrical Characteristics—REF196 @ −40°C ≤ T
A
≤ +85°C 12
Electrical Characteristics—REF196 @ −40°C ≤ T
A
≤ +125°C
....................................................................................................... 12
Electrical Characteristics—REF198 @ T
A
= 25°C .................. 13
Electrical Characteristics—REF198 @ −40°C ≤ T
A
≤ +85°C 13
Electrical Characteristics—REF198 @ −40°C ≤ T
A
≤
+125°C
....................................................................................................... 14
Wafer Test Limits........................................................................ 14
Absolute Maximum Ratings ......................................................... 15
Thermal Resistance .................................................................... 15
ESD Caution................................................................................ 15
Typical Performance Characteristics ........................................... 16
Applications..................................................................................... 19
Output Short-Circuit Behavior ................................................ 19
Device Power Dissipation Considerations.............................. 19
Output Voltage Bypassing ......................................................... 19
Sleep Mode Operation............................................................... 19
Basic Voltage Reference Connections ..................................... 19
Membrane Switch-Controlled Power Supply ......................... 19
Current-Boosted References with Current Limiting............. 20
Negative Precision Reference without Precision Resistors ... 20
Stacking Reference ICs for Arbitrary Outputs ....................... 21
Precision Current Source .......................................................... 21
Switched Output 5 V/3.3 V Reference..................................... 22
Kelvin Connections.................................................................... 22
Fail-Safe 5 V Reference.............................................................. 23
Low Power, Strain Gage Circuit ............................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 26
REVISION HISTORY
9/06—Rev. H to Rev. I
Updated Format..................................................................Universal
Changes to Table 25 ....................................................................... 15
Changes to Figure 6........................................................................ 16
Changes to Figure 10, Figure 12, Figure 14, and Figure 16....... 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 24...................................................................... 19
Updated Outline Dimensions....................................................... 23
1/96—Revision 0: Initial Version
Rev. I | Page 2 of 28
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