Precision Micropower, Low Dropout
Voltage References
REF19x Series
TEST PINS
FEATURES
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.
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
TP
1
2
3
4
8
7
6
5
NC
REF19x
SERIES
TOP VIEW
(Not to Scale)
V
NC
S
APPLICATIONS
Portable instruments
ADCs and DACs
Smart sensors
Solar-powered applications
Loop current-powered instruments
SLEEP
GND
OUTPUT
TP
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
Figure 1. 8-Lead SOIC_N and TSSOP Pin Configuration
(S Suffix and RU Suffix)
GENERAL DESCRIPTION
TP
1
2
3
4
8
7
6
5
NC
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.
REF19x
SERIES
TOP VIEW
(Not to Scale)
V
NC
S
SLEEP
GND
OUTPUT
TP
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
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
Figure 2. 8-Lead PDIP Pin Configuration
(P Suffix)
SLEEP
Table 1. Nominal Output Voltage
pin, the output is turned off, and supply current is
Part Number
Nominal Output Voltage (V)
further reduced to less than 15 μA.
REF191
REF192
REF193
REF194
REF195
REF196
REF198
2.048
2.50
3.00
4.50
5.00
3.30
4.096
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.
Rev. I
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