a
FEATURES
Initial Accuracy: 2 mV max
Temperature Coefficient: 5 ppm/°C max
Low Supply Current: 45 A max
Sleep Mode: 15 A max
Low Dropout Voltage
Load Regulation: 4 ppm/mA
Line Regulation: 4 ppm/V
High Output Current: 30 mA
Short Circuit Protection
APPLICATIONS
Portable Instrumentation
A-to-D and D-to-A Converters
Smart Sensors
Solar Powered Applications
Loop Current Powered Instrumentations
GENERAL DESCRIPTION
Precision Micropower, Low Dropout,
Voltage References
REF19x Series
PIN CONFIGURATIONS
8-Lead Narrow-Body SO and TSSOP
(S Suffix and RU Suffix)
TP
V
S
SLEEP
GND
1
2
3
4
8 NC
REF19x
SERIES
TOP VIEW
(Not to Scale)
7 NC
6 OUTPUT
5 TP
8-Lead Epoxy DIP (P Suffix)
TP
V
S
SLEEP
GND
1
2
3
4
8
NC
NC
OUTPUT
TP
REF19x
SERIES
TOP VIEW
(Not to Scale)
7
6
5
REF19x series precision bandgap voltage references use a pat-
ented temperature drift curvature correction circuit and laser
trimming of highly stable thin film resistors to achieve a very low
temperature coefficient and a high initial accuracy.
The REF19x series are micropower, Low Dropout Voltage
(LDV) devices providing a 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 applica-
tions such as automotive.
All electrical grades are available in 8-Lead SOIC; the PDIP and
TSSOP are only available in the lowest electrical grade. Prod-
ucts are also available in die form.
Test Pins (TP)
Model
REF19xGP
REF19xES
3
REF19xFS
3
REF19xGS
REF19xGRU
REF19xGBC
NC = NO CONNECT
TP PINS ARE FACTORY TEST POINTS
NO USER CONNECTION
Table I
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
ORDERING GUIDE
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
+25°C
Package
Description
8-Lead Plastic DIP
2
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead TSSOP
DICE
Package
Option
1
N-8
SO-8
SO-8
SO-8
RU-8
The test pins, Pin 1 and Pin 5, are reserved for in-package
zener-zap. To achieve the highest level of accuracy at the out-
put, the zener-zapping technique is used to trim the output
voltage. Since each unit may require a different amount of ad-
justment, the resistance value at the test pins will vary widely
from pin-to-pin as well as from part-to-part. The user should
not make any physical nor electrical connections to Pin 1 and
Pin 5.
NOTES
1
N = Plastic DIP, SO = Small Outline, RU = Thin Shrink Small Outline.
2
8-Lead plastic DIP only available in “G” grade.
3
REF193 and REF196 are available in “G” grade only.
REV. D
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
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