REF198ESZ-REEL7 [ADI]
Precision Micropower, Low Dropout Voltage References; 精密微功耗,低压差电压基准型号: | REF198ESZ-REEL7 |
厂家: | ADI |
描述: | Precision Micropower, Low Dropout Voltage References |
文件: | 总28页 (文件大小:659K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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
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 registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
REF19x Series
TABLE OF CONTENTS
Specifications..................................................................................... 3
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
Electrical Characteristics—REF191 @ TA = 25°C.................... 3
Electrical Characteristics—REF191 @ −40°C ≤ TA ≤ +85°C .. 4
Electrical Characteristics—REF191 @ −40°C ≤ TA ≤+125°C. 5
Electrical Characteristics—REF192 @ TA = 25°C.................... 5
Electrical Characteristics—REF192 @ −40°C ≤ TA ≤ +85°C.. 6
Electrical Characteristics—REF192 @ −40°C ≤ TA ≤ +125°C 6
Electrical Characteristics—REF193 @ TA = 25°C.................... 7
Electrical Characteristics—REF193 @ −40°C ≤ TA ≤ +85°C.. 7
Electrical Characteristics—REF193 @ TA ≤ −40°C ≤ +125°C 8
Electrical Characteristics—REF194 @ Ta = 25°C..................... 8
Electrical Characteristics—REF194 @ −40°C ≤ TA ≤ +85°C.. 9
Electrical Characteristics—REF194 @ −40°C ≤ TA ≤ +125°C 9
Electrical Characteristics—REF195 @ TA = 25°C.................. 10
Electrical Characteristics—REF195 @ −40°C ≤ TA ≤ +85°C 10
Electrical Characteristics—REF195 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 11
Electrical Characteristics—REF196 @ TA = 25°C.................. 11
Electrical Characteristics—REF196 @ −40°C ≤ TA ≤ +85°C 12
Electrical Characteristics—REF196 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 12
Electrical Characteristics—REF198 @ TA = 25°C.................. 13
Electrical Characteristics—REF198 @ −40°C ≤ TA ≤ +85°C 13
Electrical Characteristics—REF198 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 14
REVISION HISTORY
7/04—Rev. F to Rev. G
Changes to Ordering Guide.............................................................4
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
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
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
1/96—Revision 0: Initial Version
Rev. I | Page 2 of 28
REF19x Series
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—REF191 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INITIAL ACCURACY1
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade
VO
IOUT = 0 mA
2.046
2.043
2.038
2.048
2.050
2.053
2.058
V
V
V
LINE REGULATION2
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA
2
4
4
8
ppm/V
ppm/V
F and G Grades
LOAD REGULATION2
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
4
6
10
15
ppm/mA
ppm/mA
VS = 3.15 V, ILOAD = 2 mA
VS = 3.3 V, ILOAD = 10 mA
VS = 3.6 V, ILOAD = 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
0.95
1.25
1.55
V
V
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
20
mV
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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. I | Page 3 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF191 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 3.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
5
10
25
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 25°C
5
10
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
15
20
ppm/mA
ppm/mA
VS = 3.15 V, ILOAD = 2 mA
VS = 3.3 V, ILOAD = 10 mA
VS = 3.6 V, ILOAD = 25 mA
0.95
1.25
1.55
V
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 4 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF191 @ −40°C ≤ TA ≤+125°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 4.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
10
20
ppm/mA
ppm/mA
VS = 3.3 V, ILOAD = 10 mA
VS = 3.6 V, ILOAD = 20 mA
1.25
1.55
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF192 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 5.
Parameter
INITIAL ACCURACY1
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade
VO
IOUT = 0 mA
2.498
2.495
2.490
2.500
2.502
2.505
2.510
V
V
V
LINE REGULATION2
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA
2
4
4
8
ppm/V
ppm/V
F and G Grades
LOAD REGULATION2
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
4
6
10
15
ppm/mA
ppm/mA
V
VS = 3.5 V, ILOAD = 10 mA
VS = 3.9 V, ILOAD = 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
1.00
1.40
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
25
mV
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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. I | Page 5 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF192 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 6.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
5
10
25
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA
5
10
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
15
20
ppm/mA
ppm/mA
VS = 3.5 V, ILOAD = 10 mA
VS = 4.0 V, ILOAD = 25 mA
1.00
1.50
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF192 @ −40°C ≤ TA ≤ +125°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 7.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
10
20
ppm/mA
ppm/mA
VS = 3.5 V, ILOAD = 10 mA
VS = 4.0 V, ILOAD = 20 mA
1.00
1.50
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 6 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF193 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 8.
Parameter
Mnemonic
VO
Condition
Min
Typ
3.0
4
Max
3.010
8
Unit
V
INITIAL ACCURACY1
G Grade
LINE REGULATION2
G Grade
IOUT = 0 mA
2.990
ΔVO/ΔVIN
3.3 V, ≤ VS ≤ 15 V, IOUT = 0 mA
ppm/V
LOAD REGULATION2
G Grade
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA
VS = 3.8 V, ILOAD = 10 mA
VS = 4.0 V, ILOAD = 30 mA
1000 hours @ 125°C
6
15
0.80
1.00
ppm/mA
DROPOUT VOLTAGE
V
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
30
mV
0.1 Hz to 10 Hz
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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.
ELECTRICAL CHARACTERISTICS—REF193 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 9.
Parameter
TEMPERATURE COEFFICIENT1, 2
G Grade3
LINE REGULATION4
G Grade
Mnemonic
TCVO/°C
Condition
Min
Typ
10
Max
25
Unit
IOUT = 0 mA
ppm/°C
ppm/V
ΔVO/ΔVIN
3.3 V ≤ VS ≤ 15 V, IOUT = 0 mA
10
20
LOAD REGULATION4
G Grade
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA
VS = 3.8 V, ILOAD = 10 mA
VS = 4.1 V, ILOAD = 30 mA
10
20
ppm/mA
DROPOUT VOLTAGE
0.80
1.10
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 7 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF193 @ TA ≤ −40°C ≤ +125°C
@ VS = 3.3 V, –40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 10.
Parameter
TEMPERATURE COEFFICIENT1 ,2
G Grade3
LINE REGULATION4
G Grade
LOAD REGULATION4
G Grade
Mnemonic
TCVO/°C
Condition
Min
Typ Max Unit
IOUT = 0 mA
10
20
10
ppm/°C
ΔVO/ΔVIN
3.3 V ≤ VS ≤ 15 V, IOUT = 0 mA
ppm/V
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA
VS = 3.8 V, ILOAD = 10 mA
VS = 4.1 V, ILOAD = 20 mA
ppm/mA
DROPOUT VOLTAGE
0.80
1.10
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF194 @ TA = 25°C
@ VS = 5.0 V, TA = 25°C, unless otherwise noted.
Table 11.
Parameter
INITIAL ACCURACY1
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade
VO
IOUT = 0 mA
4.498 4.5
4.495
4.490
4.502
4.505
4.510
V
V
V
LINE REGULATION2
E Grade
∆VO/∆VIN
4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.8 V, 0 mA ≤ IOUT ≤ 30 mA
2
4
4
8
ppm/V
ppm/V
F and G Grades
LOAD REGULATION2
E Grade
F and G Grades
DROPOUT VOLTAGE
∆VO/∆VLOAD
VS − VO
2
4
4
8
ppm/mA
ppm/mA
V
VS = 5.00 V, ILOAD = 10 mA
VS = 5.8 V, ILOAD = 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
0.50
1.30
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
2
mV
45
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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. I | Page 8 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF194 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 12.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
5
10
25
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
∆VO/∆VIN
4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.80 V, 0 mA ≤ IOUT ≤ 25 mA
5
10
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
∆VO/∆VLOAD
VS − VO
5
10
15
20
ppm/mA
ppm/mA
VS = 5.00 V, ILOAD = 10 mA
VS = 5.80 V, ILOAD = 25 mA
0.5
1.30
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF194 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 13.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.80 V, 0 mA ≤ IOUT ≤ 20 mA
5
10
ppm/V
ppm/V
F and G Grades
LOAD REGULATION
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
ppm/mA
ppm/mA
VS = 5.10 V, ILOAD = 10 mA
VS = 5.95 V, ILOAD = 20 mA
0.60
1.45
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 9 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF195 @ TA = 25°C
@ VS = 5.10 V, TA = 25°C, unless otherwise noted.
Table 14.
Parameter
Mnemonic
Condition
Min
Typ
Max
Unit
INITIAL ACCURACY1
E Grade
F Grade
G Grade
VO
IOUT = 0 mA
4.998 5.0
4.995
4.990
5.002
5.005
5.010
V
V
V
LINE REGULATION2
E Grade
ΔVO/ΔVIN
5.10 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 6.30 V, 0 mA ≤ IOUT ≤ 30 mA
2
4
4
8
ppm/V
ppm/V
F and G Grades
LOAD REGULATION2
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
2
4
4
8
ppm/mA
ppm/mA
V
VS = 5.50 V, ILOAD = 10 mA
VS = 6.30 V, ILOAD = 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
0.50
1.30
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
50
mV
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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.
ELECTRICAL CHARACTERISTICS—REF195 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.15 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 15.
Parameter
TEMPERATURE COEFFICIENT1,2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
5
10
25
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
5.15 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 6.30 V, 0 mA ≤ IOUT ≤ 25 mA
5
10
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
10
20
ppm/mA
ppm/mA
VS = 5.50 V, ILOAD = 10 mA
VS = 6.30 V, ILOAD = 25 mA
0.50
1.30
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 10 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF195 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.20 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 16.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
5.20 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 6.45 V, 0 mA ≤ IOUT ≤ 20 mA
5
10
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
ΔVO/ΔVLOAD
5
ppm/mA
F and G Grades
DROPOUT VOLTAGE
10
ppm/mA
VS = 5.60 V, ILOAD = 10 mA
VS = 6.45 V, ILOAD = 20 mA
0.60
1.45
V
V
VS − VO
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF196 @ TA = 25°C
@ VS = 3.5 V, TA = 25°C, unless otherwise noted.
Table 17.
Parameter
Mnemonic
VO
Condition
Min
Typ
Max
3.310
8
Unit
V
INITIAL ACCURACY1
G Grade
LINE REGULATION2
G Grade
LOAD REGULATION2
G Grade
IOUT = 0 mA
3.290 3.3
ΔVO/ΔVIN
3.50 V ≤ VS ≤ 15 V, IOUT = 0 mA
4
6
ppm/V
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA
VS = 4.1 V, ILOAD = 10 mA
VS = 4.3 V, ILOAD = 30 mA
1000 hours @ 125°C
15
ppm/mA
DROPOUT VOLTAGE
0.80
1.00
V
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
33
mV
0.1 Hz to 10 Hz
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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. I | Page 11 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF196 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.5 V, –40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 18.
Parameter
Mnemonic
TCVO/°C
Condition
Min
Typ
10
Max
25
Unit
TEMPERATURE COEFFICIENT1, 2
G Grade3
LINE REGULATION4
G Grade
IOUT = 0 mA
ppm/°C
ppm/V
ΔVO/ΔVIN
3.5 V ≤ VS ≤ 15 V, IOUT = 0 mA
10
20
LOAD REGULATION4
G Grade
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA
VS = 4.1 V, ILOAD = 10 mA
VS = 4.3 V, ILOAD = 25 mA
10
20
ppm/mA
DROPOUT VOLTAGE
0.80
1.00
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF196 @ −40°C ≤ TA ≤ +125°C
@ VS = 3.50 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 19.
Parameter
TEMPERATURE COEFFICIENT1, 2
G Grade3
LINE REGULATION4
G Grade
Mnemonic
TCVO/°C
Condition
Min
Typ
10
Max
Unit
IOUT = 0 mA
ppm/°C
ppm/V
ΔVO/ΔVIN
3.50 V ≤ VS ≤ 15 V, IOUT = 0 mA
20
LOAD REGULATION4
G Grade
ΔVO/ΔVLOAD
VS − VO
VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA
VS = 4.1 V, ILOAD = 10 mA
VS = 4.4 V, ILOAD = 20 mA
20
ppm/mA
DROPOUT VOLTAGE
0.80
1.10
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 12 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF198 @ TA = 25°C
@ VS = 5.0 V, TA = 25°C, unless otherwise noted.
Table 20.
Parameter
INITIAL ACCURACY1
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade
VO
IOUT = 0 mA
4.094
4.091
4.086
4.096
4.098
4.101
4.106
V
V
V
LINE REGULATION2
E Grade
ΔVO/ΔVIN
4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.4 V, 0 mA ≤ IOUT ≤ 30 mA
2
4
4
8
ppm/V
ppm/V
F and G Grades
LOAD REGULATION2
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
2
4
4
8
ppm/mA
ppm/mA
V
VS = 4.6 V, ILOAD = 10 mA
VS = 5.4 V, ILOAD = 30 mA
1000 hours @ 125°C
0.1 Hz to 10 Hz
0.502
1.30
V
LONG-TERM STABILITY3
NOISE VOLTAGE
DVO
eN
1.2
40
mV
μV p-p
1 Initial accuracy includes temperature hysteresis effect.
2 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.
ELECTRICAL CHARACTERISTICS—REF198 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 21.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
5
10
25
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.4 V, 0 mA ≤ IOUT ≤ 25 mA
5
10
10
20
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
10
20
ppm/mA
ppm/mA
VS = 4.6 V, ILOAD = 10 mA
VS = 5.4 V, ILOAD = 25 mA
0.502
1.30
V
V
SLEEP
PIN
Logic High Input Voltage
Logic High Input Current
Logic Low Input Voltage
Logic Low Input Current
SUPPLY CURRENT
VH
IH
VL
IL
2.4
V
μA
V
μA
μA
μA
−8
0.8
−8
45
15
No load
No load
Sleep Mode
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Rev. I | Page 13 of 28
REF19x Series
ELECTRICAL CHARACTERISTICS—REF198 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 22.
Parameter
TEMPERATURE COEFFICIENT1, 2
Mnemonic
Condition
Min
Typ
Max
Unit
E Grade
F Grade
G Grade3
TCVO/°C
IOUT = 0 mA
2
5
10
ppm/°C
ppm/°C
ppm/°C
LINE REGULATION4
E Grade
ΔVO/ΔVIN
4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA
VS = 5.6 V, 0 mA ≤ IOUT ≤ 20 mA
5
10
ppm/V
ppm/V
F and G Grades
LOAD REGULATION4
E Grade
F and G Grades
DROPOUT VOLTAGE
ΔVO/ΔVLOAD
VS − VO
5
10
ppm/mA
ppm/mA
VS = 4.7 V, ILOAD = 10 mA
VS = 5.6 V, ILOAD = 20 mA
0.60
1.50
V
V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN
)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
WAFER TEST LIMITS
For proper operation, a 1 μF capacitor is required between the output pins and the GND pin of the REF19x. Electrical tests and wafer
probe to the limits are shown in
Table 23. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed for standard product dice.
Consult factory to negotiate specifications based on dice lot qualifications through sample lot assembly and testing.
@ ILOAD = 0 mA, TA = 25°C, unless otherwise noted.
Table 23.
Parameter
INITIAL ACCURACY
REF191
REF192
REF193
REF194
REF195
REF196
REF198
Mnemonic
Condition
Limit
Unit
VO
2.043/2.053
2.495/2.505
2.990/3.010
4.495/4.505
4.995/5.005
3.290/3.310
4.091/4.101
15
V
V
V
V
V
V
V
LINE REGULATION
LOAD REGULATION
DROPOUT VOLTAGE
ΔVO/ΔVIN
ΔVO/ΔILOAD
VO − V+
(VO + 0.5 V) < VIN < 15 V, IOUT = 0 mA
0 mA < ILOAD < 30 mA, VIN = (VO + 1.3 V)
ILOAD = 10 mA
ppm/V
15
ppm/mA
1.25
1.55
V
V
ILOAD = 30 mA
SLEEP
MODE INPUT
Logic Input High
Logic Input Low
SUPPLY CURRENT
Sleep Mode
VIH
VIL
2.4
0.8
45
V
V
VIN = 15 V
No load
No load
μA
μA
15
Rev. I | Page 14 of 28
REF19x Series
ABSOLUTE MAXIMUM RATINGS
Table 24.
Parameter1
Rating
THERMAL RESISTANCE
Supply Voltage
Output to GND
−0.3 V, +18 V
−0.3 V, VS + 0.3 V
Indefinite
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Output to GND Short-Circuit Duration
Storage Temperature Range
PDIP, SOIC_N Package
Operating Temperature Range
REF19x
Junction Temperature Range
PDIP, SOIC_N Package
Lead Temperature Range (Soldering 60 sec)
Table 25. Thermal Resistance
Package Type
1
−65°C to +150°C
−40°C to +85°C
Unit
θJA
θJC
43
43
8-Lead PDIP
8-Lead SOIC_N
103
158
°C/W
°C/W
1 θJA is specified for worst-case conditions; that is, θJA is specified for the device
in socket for PDIP and is specified for the device soldered in the circuit board
for the SOIC package.
−65°C to +150°C
300°C
1 Absolute maximum ratings apply to both DICE and packaged parts, unless
otherwise noted.
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. I | Page 15 of 28
REF19x Series
TYPICAL PERFORMANCE CHARACTERISTICS
5.004
50
45
40
35
30
25
20
15
10
5
3 TYPICAL PARTS
BASED ON 600
UNITS, 4 RUNS
5.15V < V < 15V
IN
5.003
5.002
5.001
5.000
4.999
4.998
4.997
4.996
–40°C ≤ T ≤ +85°C
A
0
20
–50
–25
0
25
50
75
100
15
10
5
0
5
10
15
20
TEMPERATURE (°C)
T
—V
OUT
(ppm/°C)
C
Figure 3. REF195 Output Voltage vs. Temperature
Figure 6. TC—VOUT Distribution
32
28
24
20
16
12
8
40
35
30
25
20
15
10
5
5.15V ≤ V ≤ 15V
S
NORMAL MODE
–40°C
+25°C
+85°C
4
SLEEP MODE
0
0
–50
0
5
10
15
(mA)
20
25
30
–25
0
25
50
75
100
I
TEMPERATURE (°C)
LOAD
Figure 4. REF195 Load Regulator vs. ILOAD
Figure 7. Supply Current vs. Temperature
20
16
12
8
–6
–5
–4
–3
–2
–1
0
0mA ≤ I
OUT
≤ 25mA
+85°C
+25°C
–40°C
V
V
L
4
H
0
4
6
8
10
(V)
12
14
16
–50
–25
0
25
50
75
100
V
TEMPERATURE (°C)
IN
Figure 5. REF195 Line Regulator vs. VIN
SLEEP
Pin Current vs. Temperature
Figure 8.
Rev. I | Page 16 of 28
REF19x Series
REF19x
2
4
V
= 15V
IN
0
–20
6
10mA
0
1µF
Figure 13. Load Transient Response Measurement Circuit
–40
–60
–80
2V
100%
90%
–100
–120
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 9. Ripple Rejection vs. Frequency
1mA
LOAD
30mA
LOAD
10µF
10%
0%
REF19x
10µF
1kΩ
1kΩ
V
= 15V
2
6
OUTPUT
IN
2V
100µs
4
10µF
1µF
REF
Figure 10. Ripple Rejection vs. Frequency Measurement Circuit
Figure 14. Power-On Response Time
REF19x
V
= 7V
200V
IN
REF19x
2
6
2
4
V
V
= 2V p-p
= 4V
6
G
S
V
= 7V
4
IN
1µF
1µF
1µF
Z
Figure 15. Power-On Response Time Measurement Circuit
4
3
2
1
0
5V
100%
90%
ON
OFF
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 11. Output Impedance vs. Frequency
I
= 1mA
L
V
OUT
I
= 10mA
L
5V
10%
0%
OFF
ON
100%
90%
2ms
1V
SLEEP
Figure 16.
Response Time
REF19x
= 15V
V
IN
2
V
OUT
6
10%
0%
3
1µF
4
20mV
100µs
Figure 12. Load Transient Response
SLEEP
Response Time Measurement Circuit
Figure 17.
Rev. I | Page 17 of 28
REF19x Series
35
30
25
20
15
10
5
5V
100%
90%
10%
0%
200mV
200µs
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
REF195 DROPOUT VOLTAGE (V)
Figure 18. Line Transient Response
Figure 19. Load Current vs. Dropout Voltage
Rev. I | Page 18 of 28
REF19x Series
APPLICATIONS
OUTPUT SHORT-CIRCUIT BEHAVIOR
SLEEP MODE OPERATION
The REF19x family of devices is completely protected from
damage due to accidental output shorts to GND or to V+. In the
event of an accidental short-circuit condition, the reference
device shuts down and limits its supply current to 40 mA.
All REF19x devices include a sleep capability that is
TTL/CMOS-level compatible. Internally, a pull-up current
source to VIN is connected at the
pin. This permits the
SLEEP
pin to be driven from an open collector/drain driver. A
SLEEP
logic low or a 0 V condition on the
V
+
pin is required to
SLEEP
turn off the output stage. During sleep, the output of the
references becomes a high impedance state where its potential
would then be determined by external circuitry. If the sleep
V
OUT
SLEEP
feature is not used, it is recommended that the
connected to VIN (Pin 2).
pin be
SLEEP (SHUTDOWN)
BASIC VOLTAGE REFERENCE CONNECTIONS
The circuit in Figure 21 illustrates the basic configuration for
the REF19x family of references. Note the 10 μF/0.1 μF bypass
network on the input and the 1 μF/0.1 μF bypass network on
the output. It is recommended that no connections be made to
Pin 1, Pin 5, Pin 7, and Pin 8. If the sleep feature is not required,
Pin 3 should be connected to VIN.
GND
Figure 20. Simplified Schematic
DEVICE POWER DISSIPATION CONSIDERATIONS
REF19x
The REF19x family of references is capable of delivering load
currents to 30 mA with an input voltage that ranges from
3.3 V to 5 V. When these devices are used in applications with
large input voltages, exercise care to avoid exceeding the
maximum internal power dissipation of these devices.
Exceeding the published specifications for maximum power
dissipation or junction temperature can result in premature
device failure. The following formula should be used to
calculate a device’s maximum junction temperature or
dissipation:
1
2
3
4
8
7
6
5
NC
NC
V
IN
NC
OUTPUT
10µF
0.1µF
SLEEP
+
1µF
TANT
0.1µF
NC
NC = NO CONNECT
Figure 21. Basic Voltage Reference Configuration
MEMBRANE SWITCH-CONTROLLED POWER
SUPPLY
With output load currents in the tens of mA, the REF19x family
of references can operate as a low dropout power supply in
hand-held instrument applications. In the circuit shown in
Figure 22, a membrane on/off switch is used to control the
operation of the reference. During an initial power-on condition,
TJ − TA
PD =
θJA
In this equation, TJ and TA are the junction and ambient
temperatures, respectively; PD is the device power dissipation;
and θJA is the device package thermal resistance.
the
pin is held to GND by the 10 kΩ resistor. Recall that
SLEEP
this condition (read: three-state) disables the REF19x output.
SLEEP
OUTPUT VOLTAGE BYPASSING
When the membrane on switch is pressed, the
pin is
momentarily pulled to VIN, enabling the REF19x output. At this
point, current through the 10 kΩ resistor is reduced, and the
For stable operation, low dropout voltage regulators and
references generally require a bypass capacitor connected from
their VOUT pins to their GND pins. Although the REF19x family
of references is capable of stable operation with capacitive loads
exceeding 100 μF, a 1 μF capacitor is sufficient to guarantee
rated performance. The addition of a 0.1 μF ceramic capacitor
in parallel with the bypass capacitor improves load current
transient performance. For best line voltage transient
performance, it is recommended that the voltage inputs of these
devices be bypassed with a 10 μF electrolytic capacitor in
parallel with a 0.1 μF ceramic capacitor.
SLEEP
internal current source connected to the
control. Pin 3 assumes and remains at the same potential as VIN.
When the membrane off switch is pressed, the pin is
pin takes
SLEEP
momentarily connected to GND, which once again disables the
REF19x output.
Rev. I | Page 19 of 28
REF19x Series
REF19x
The requirement for a heat sink on Q1 depends on the maximum
input voltage and short-circuit current. With VS = 5 V and a 300
mA current limit, the worst-case dissipation of Q1 is 1.5 W, less
than the TO-220 package 2 W limit. However, if smaller TO-39
or TO-5 packaged devices, such as the 2N4033, are used, the
current limit should be reduced to keep maximum dissipation
below the package rating. This is accomplished by simply
raising R4.
1
2
3
4
8
7
6
5
NC
NC
V
IN
NC
1kΩ
5%
OUTPUT
+
1µF
TANT
NC
ON
10kΩ
OFF
NC = NO CONNECT
A tantalum output capacitor is used at C1 for its low equivalent
series resistance (ESR), and the higher value is required for
stability. Capacitor C2 provides input bypassing and can be an
ordinary electrolytic.
Figure 22. Membrane Switch-Controlled Power Supply
CURRENT-BOOSTED REFERENCES WITH
CURRENT LIMITING
While the 30 mA rated output current of the REF19x series is
higher than is typical of other reference ICs, it can be boosted to
higher levels, if desired, with the addition of a simple external
PNP transistor, as shown in Figure 23. Full-time current
limiting is used to protect the pass transistor against shorts.
Shutdown control of the booster stage is an option, and when
used, some cautions are needed. Due to the additional active
devices in the VS line to U1, a direct drive to Pin 3 does not
work as with an unbuffered REF19x device. To enable shutdown
control, the connection from U1 to U2 is broken at the X, and
Diode D1 then allows a CMOS control source, VC, to drive U1
to U3 for on/off operation. Startup from shutdown is not as
clean under heavy load as it is in basic REF19x series, and can
require several milliseconds under load. Nevertheless, it is still
effective and can fully control 150 mA loads. When shutdown
control is used, heavy capacitive loads should be minimized.
+V = 6V
TO 9V
(SEE TEXT)
S
Q1
TIP32A
(SEE TEXT)
OUTPUT TABLE
U1 (V)
R4
2Ω
V
OUT
REF192 2.5
REF193 3.0
REF196 3.3
REF194 4.5
REF195 5.0
R1
1kΩ
Q2
2N3906
C2
100µF
25V
R2
1.5kΩ
+
2
C3
0.1µF
F
U1
+V
3.3V
D1
OUT
S
NEGATIVE PRECISION REFERENCE WITHOUT
PRECISION RESISTORS
3
6
V
C
REF196
(SEE TABLE)
@ 150mA
1N4148
(SEE TEXT
ON SLEEP)
C1
10µF/25V
(TANTALUM)
4
R3
1.82kΩ
+
In many current-output CMOS DAC applications where the
output signal voltage must be the same polarity as the reference
voltage, it is often necessary to reconfigure a current-switching
DAC into a voltage-switching DAC using a 1.25 V reference, an
op amp, and a pair of resistors. Using a current-switching DAC
directly requires an additional operational amplifier at the
output to reinvert the signal. A negative voltage reference is
then desirable, because an additional operational amplifier is
not required for either reinversion (current-switching mode) or
amplification (voltage-switching mode) of the DAC output
voltage. In general, any positive voltage reference can be
converted into a negative voltage reference using an operational
amplifier and a pair of matched resistors in an inverting
configuration. The disadvantage to this approach is that the
largest single source of error in the circuit is the relative
matching of the resistors used.
R1
S
V
OUT
COMMON
F
V
S
COMMON
Figure 23. Boosted 3.3 V Referenced with Current Limiting
In this circuit, the power supply current of reference U1 flowing
through R1 to R2 develops a base drive for Q1, whose collector
provides the bulk of the output current. With a typical gain of
100 in Q1 for 100 mA to 200 mA loads, U1 is never required to
furnish more than a few mA, so this factor minimizes tempera-
ture-related drift. Short-circuit protection is provided by Q2,
which clamps the drive to Q1 at about 300 mA of load current,
with values as shown in Figure 23. With this separation of
control and power functions, dc stability is optimum, allowing
most advantageous use of premium grade REF19x devices for
U1. Of course, load management should still be exercised. A
short, heavy, low dc resistance (DCR) conductor should be used
from U1 to U6 to the VOUT Sense Point S, where the collector of
Q1 connects to the load, Point F.
The circuit illustrated in Figure 24 avoids the need for tightly
matched resistors by using an active integrator circuit. In this
circuit, the output of the voltage reference provides the input
drive for the integrator. To maintain circuit equilibrium, the
integrator adjusts its output to establish the proper relationship
between the reference’s VOUT and GND. Thus, any desired
negative output voltage can be selected by substituting for the
appropriate reference IC. The sleep feature is maintained in the
circuit with the simple addition of a PNP transistor and a 10 kΩ
resistor.
Because of the current limiting configuration, the dropout
voltage circuit is raised about 1.1 V over that of the REF19x
devices, due to the VBE of Q1 and the drop across Current Sense
Resistor R4. However, overall dropout is typically still low
enough to allow operation of a 5 V to 3.3 V regulator/reference
using the REF196 for U1 as noted, with a VS as low as 4.5 V and
a load current of 150 mA.
Rev. I | Page 20 of 28
REF19x Series
One caveat to this approach is that although rail-to-rail output
amplifiers work best in the application, these operational amplifiers
require a finite amount (mV) of headroom when required to
provide any load current. The choice for the circuit’s negative
supply should take this issue into account.
While this concept is simple, some cautions are needed. Since
the lower reference circuit must sink a small bias current from
U2 (50 μA to 100 μA), plus the base current from the series
PNP output transistor in U2, either the external load of U1 or
R1 must provide a path for this current. If the U1 minimum
load is not well defined, Resistor R1 should be used, set to a
value that conservatively passes 600 μA of current with the
applicable VOUT1 across it. Note that the two U1 and U2
reference circuits are locally treated as macrocells, each having
its own bypasses at input and output for best stability. Both U1
and U2 in this circuit can source dc currents up to their full
rating. The minimum input voltage, VS, is determined by the
sum of the outputs, VOUT2, plus the dropout voltage of U2.
V
IN
10kΩ
2N3906
SLEEP
TTL/CMOS
2
V
IN
1µF
1kΩ
3
6
SLEEP V
OUT
+5V
A1
REF19x
GND
4
100Ω
–V
1µF
REF
10kΩ
100kΩ
A related variation on stacking two 3-terminal references is
shown in Figure 26, where U1, a REF192, is stacked with a
2-terminal reference diode, such as the AD589. Like the
3-terminal stacked reference above, this circuit provides two
outputs, VOUT1 and VOUT2, which are the individual terminal
voltages of D1 and U1, respectively. Here this is 1.235 V and 2.5 V,
which provides a VOUT2 of 3.735 V. When using 2-terminal
reference diodes, such as D1, the rated minimum and maximum
device currents must be observed, and the maximum load
current from VOUT1 can be no greater than the current setup by
R1 and VO (U1). When VO (U1) is equal to 2.5 V, R1 provides a
500 μA bias to D1, so the maximum load current available at
–5V
A1 = 1/2 OP295,
1/2 OP291
Figure 24. Negative Precision Voltage Reference Uses No Precision Resistors
STACKING REFERENCE ICS FOR
ARBITRARY OUTPUTS
Some applications may require two reference voltage sources
that are a combined sum of standard outputs. The circuit shown
in Figure 25 shows how this stacked output reference can be
implemented.
OUTPUT TABLE
U1/U2
V
(V)
V
(V)
OUT1
OUT2
V
OUT1 is 450 μA or less.
+VS
REF192/REF192 2.5
REF192/REF194 2.5
REF192/REF195 2.5
5.0
7.0
7.5
V
> V
+ 0.15V
S
OUT2
+V
S
V
> V
+ 0.15V
S
OUT2
2
U2
2
C1
0.1µF
3
6
+V
REF19x
OUT2
(SEE TABLE)
U1
REF192
C1
0.1µF
+
3
6
+V
OUT2
3.735V
V
O
(U2)
C2
1µF
4
R1
4.99kΩ
(SEE TEXT)
+
+
V
V
(U1)
(D1)
C2
1µF
O
4
2
+V
OUT1
1.235V
U1
C3
1µF
D1
AD589
C3
0.1µF
3
6
O
+V
REF19x
OUT1
R1
3.9kΩ
(SEE TEXT)
(SEE TABLE)
V
+
C4
1µF
IN
COMMON
V
O
(U1)
4
V
OUT
COMMON
V
IN
COMMON
V
OUT
COMMON
Figure 26. Stacking Voltage References with the REF192
Figure 25. Stacking Voltage References with the REF19x
PRECISION CURRENT SOURCE
Two reference ICs are used, fed from a common unregulated
input, VS. The outputs of the individual ICs are connected in
series, as shown in Figure 25, which provide two output
voltages, VOUT1 and VOUT2. VOUT1 is the terminal voltage of U1,
while VOUT2 is the sum of this voltage and the terminal voltage
of U2. U1 and U2 are chosen for the two voltages that supply
the required outputs (see Output Table in Figure 25). If, for
example, both U1 and U2 are REF192s, the two outputs are 2.5 V
and 5.0 V.
In low power applications, the need often arises for a precision
current source that can operate on low supply voltages. As shown
in Figure 27, any one of the devices in the REF19x family of
references can be configured as a precision current source.
The circuit configuration illustrated is a floating current source
with a grounded load. The output voltage of the reference is
bootstrapped across RSET, which sets the output current into the
load. With this configuration, circuit precision is maintained for
load currents in the range from the reference’s supply current
(typically 30 μA) to approximately 30 mA. The low dropout
voltage of these devices maximizes the current source’s output
voltage compliance without excess headroom.
Rev. I | Page 21 of 28
REF19x Series
V
OUTPUT TABLE
IN
*
U1/U2
V
V
(V)
C
OUT
5.0
LO 3.3
REF195/
REF196
HI
2
V
REF194/
REF195
HI
LO 5.0
4.5
IN
+V = 6V
S
REF19x
2
*
CMOS LOGIC LEVELS
3
6
SLEEP
V
REF
U1
1
2
3
4
1µF
R1
P1
GND
4
3
6
V
C
REF19x
R
SET
(SEE TABLE)
I
SY
ADJUST
U3A
U3B
4
74HC04 74HC04
+V
OUT
I
OUT
V
≥ I
× R (MAX) + V (MIN)
SY
IN
OUT
L
V
R
OUT
L
2
I
=
+ I (REF19x)
SY
OUT
R
+
C2
SET
U2
1µF
3
6
REF19x
V
E.G., REF195: V
= 5V
OUT
= 5mA
OUT
>> I
SY
(SEE TABLE)
I
OUT
R
SET
C1
0.1µF
R1 = 953Ω
P1 = 100Ω, 10-TURN
4
V
IN
COMMON
Figure 27. A Low Dropout, Precision Current Source
V
OUT
COMMON
The governing equations for the circuit are
Figure 28. Switched Output Reference
VIN = IOUT × RL
(
Max
)
+ VSY
Min, REF19x
Using dissimilar REF19x series devices with this configuration
allows logic selection between the U1/U2-specified terminal
voltages. For example, with U1 (a REF195) and U2 (a REF196),
as noted in the table in Figure 28, changing the CMOS-
compatible VC logic control voltage from HI to LO selects
between a nominal output of 5 V and 3.3 V, and vice versa.
Other REF19x family units can also be used for U1/U2, with
similar operation in a logic sense, but with outputs as per the
individual paired devices (see the table in Figure 28). Of course,
the exact output voltage tolerance, drift, and overall quality of
the reference voltage is consistent with the grade of individual
U1 and U2 devices.
VOUT
RSET
IOUT
=
+ ISY
(
REF19x
)
VOUT
RSET
〉〉 ISY
(
REF19x
)
SWITCHED OUTPUT 5 V/3.3 V REFERENCE
Applications often require digital control of reference voltages,
selecting between one stable voltage and a second. With the
sleep feature inherent to the REF19x series, switched output
reference configurations are easily implemented with little
additional hardware.
Due to the nature of the wire-OR, one application caveat should
be understood about this circuit. Since U1 and U2 can only
source current effectively, negative going output voltage
changes, which require the sinking of current, necessarily takes
longer than positive going changes. In practice, this means that
the circuit is quite fast when undergoing a transition from 3.3 V
to 5 V, but the transition from 5 V to 3.3 V takes longer. Exactly
how much longer is a function of the load resistance, RL, seen at
the output and the typical 1 μF value of C2. In general, a
conservative transition time is approximately several milliseconds
for load resistances in the range of 100 Ω to 1 kΩ. Note that for
highest accuracy at the new output voltage, several time
constants should be allowed (>7.6 time constants for <1/2 LSB
error @ 10 bits, for example).
The circuit in Figure 28 illustrates the general technique, which
takes advantage of the output wire-OR capability of the REF19x
device family. When off, a REF19x device is effectively an open
circuit at the output node with respect to the power supply.
When on, a REF19x device can source current up to its current
rating, but sink only a few μA (essentially, just the relatively low
current of the internal output scaling divider). Consequently,
when two devices are wired together at their common outputs,
the output voltage is the same as the output voltage for the on
device. The off state device draws a small standby current of
15 μA (max), but otherwise does not interfere with operation of
the on device, which can operate to its full current rating. Note
that the two devices in the circuit conveniently share both input
and output capacitors, and with CMOS logic drive, it is power
efficient.
KELVIN CONNECTIONS
In many portable applications where the PC board cost and area
go hand-in-hand, circuit interconnects are very often narrow.
These narrow lines can cause large voltage drops if the voltage
reference is required to provide load currents to various
functions. The interconnections of a circuit can exhibit a typical
line resistance of 0.45 mΩ/square (1 oz. Cu, for example).
Rev. I | Page 22 of 28
REF19x Series
In applications where these devices are configured as low
dropout voltage regulators, these wiring voltage drops can
become a large source of error. To circumvent this problem,
force and sense connections can be made to the reference
through the use of an operational amplifier, as shown in Figure 29.
This method provides a means by which the effects of wiring
resistance voltage drops can be eliminated. Load currents flowing
through wiring resistance produce an I-R error (ILOAD × RWIRE) at
the load. However, the Kelvin connection overcomes the problem
by including the wiring resistance within the forcing loop of the
op amp. Because the op amp senses the load voltage, op amp
loop control forces the output to compensate for the wiring
error and to produce the correct voltage at the load. Depending
on the reference device chosen, operational amplifiers that can
be used in this application are the OP295, OP292, and OP183.
The circuit in Figure 30 illustrates this concept, which borrows
from the switched output idea of Figure 28, again using the
REF19x device family output wire-OR capability. In this case,
since a constant 5 V reference voltage is desired for all
conditions, two REF195 devices are used for U1 and U2, with
their on/off switching controlled by the presence or absence of
the primary dc supply source, VS. VBAT is a 6 V battery backup
source that supplies power to the load only when VS fails. For
normal (VS present) power conditions, VBAT sees only the 15 μA
(maximum) standby current drain of U1 in its off state.
In operation, it is assumed that for all conditions, either U1 or
U2 is on, and a 5 V reference output is available. With this
voltage constant, a scaled down version is applied to the
Comparator IC U3, providing a fixed 0.5 V input to the negative
input for all power conditions. The R1 to R2 divider provides
a signal to the U3 positive input proportionally to VS, which
switches U3 and U1/U2, dependent upon the absolute level of
VS. In Figure 30, Op Amp U3 is configured as a comparator
with hysteresis, which provides clean, noise-free output
switching. This hysteresis is important to eliminate rapid
switching at the threshold due to VS ripple. Furthermore, the
device chosen is the AD820, a rail-to-rail output device. This
device provides HI and LO output states within a few mV of VS,
ground for accurate thresholds, and compatible drive for U2 for
all VS conditions. R3 provides positive feedback for circuit
hysteresis, changing the threshold at the positive input as
a function of the output of U3.
V
IN
V
IN
R
LW
+V
OUT
SENSE
2
2
3
V
IN
R
LW
1
+V
OUT
FORCE
A1
3
6
SLEEP
V
OUT
REF19x
GND
4
A1 = 1/2 OP295
1/2 OP292
R
L
1µF 100kΩ
OP183
Figure 29. A Low Dropout, Kelvin-Connected Voltage Reference
FAIL-SAFE 5 V REFERENCE
Some critical applications require a reference voltage to be
maintained at a constant voltage, even with a loss of primary
power. The low standby power of the REF19x series and the
switched output capability allow a fail-safe reference
configuration to be implemented rather easily. This reference
maintains a tight output voltage tolerance for either a primary
power source (ac line derived) or a standby (battery derived)
power source, automatically switching between the two as the
power conditions change.
+V
BAT
2
+V
C2
0.1µF
S
U1
R1
1.1MΩ
3
6
R3
10MΩ
R6
100Ω
REF195
(SEE TABLE)
Q1
5.000V
2N3904
4
C1
3
+
–
0.1µF
7
4
6
U3
AD820
2
2
+
C3
U2
1µF
3
6
REF195
R2
100kΩ
(SEE TABLE)
R4
4
900kΩ
C4
R5
0.1µF 100kΩ
V , V
BAT
COMMON
S
V
OUT
COMMON
Figure 30. A Fail-Safe 5 V Reference
Rev. I | Page 23 of 28
REF19x Series
100Ω
For VS levels lower than the lower threshold, U3 output is low;
thus, U2 and Q1 are off while U1 is on. For VS levels higher
than the upper threshold, the situation reverses, with U1 off and
both U2 and Q1 on. In the interest of battery power
conservation, all of the comparison switching circuitry is
powered from VS and is arranged so that when VS fails, the
default output comes from U1.
REF195
10µF
2
6
+
+
4
10µF
1µF
57kΩ
1%
0.1µF
4
For the R1 to R3 values, as shown in Figure 30, lower/upper VS
switching thresholds are approximately 5.5 V and 6 V, respectively.
These can be changed to suit other VS supplies, as can the REF19x
devices used for U1 and U2, over a range of 2.5 V to5 V of output.
U3 can operate down to a VS of 3.3 V, which is generally
compatible with all REF19x family devices.
3
+
1/4
OP492
1
2N2222
10kΩ
1%
–
2
11
0.1µF
500Ω
0.1%
LOW POWER, STRAIN GAGE CIRCUIT
10kΩ
1%
0.01µF
As shown in Figure 31, the REF19x family of references can be
used in conjunction with low supply voltage operational amplifiers,
such as the OP492 or the OP283, in a self-contained strain gage
circuit in which the REF195 is used as the core. Other
references can be easily accommodated by changing circuit
element values. The references play a dual role, first as the
voltage regulator to provide the supply voltage requirements of
the strain gage and the operational amplifiers, and second as
a precision voltage reference for the current source used to
stimulate the bridge. A distinct feature of the circuit is that it
can be remotely controlled on or off by digital means via
20kΩ
1%
20kΩ
13
12
–
1/4
OP492
+
10kΩ
1%
1%
14
6
5
–
1/4
OP492
+
7
OUTPUT
2.21kΩ
20kΩ
9
–
1%
1/4
OP492
+
8
20kΩ
1%
10
Figure 31. A Low Power, Strain Gage Circuit
SLEEP
the
pin.
Rev. I | Page 24 of 28
REF19x Series
OUTLINE DIMENSIONS
0.400 (10.16)
0.365 (9.27)
0.355 (9.02)
8
1
5
4
0.280 (7.11)
0.250 (6.35)
0.240 (6.10)
5.00 (0.1968)
4.80 (0.1890)
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
8
1
5
4
0.100 (2.54)
6.20 (0.2440)
5.80 (0.2284)
BSC
4.00 (0.1574)
3.80 (0.1497)
0.060 (1.52)
MAX
0.195 (4.95)
0.130 (3.30)
0.115 (2.92)
0.210 (5.33)
MAX
0.015
(0.38)
MIN
0.150 (3.81)
0.130 (3.30)
0.115 (2.92)
0.015 (0.38)
GAUGE
PLANE
0.50 (0.0196)
45°
1.27 (0.0500)
BSC
0.014 (0.36)
0.010 (0.25)
0.008 (0.20)
SEATING
PLANE
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0099)
0.022 (0.56)
0.018 (0.46)
0.014 (0.36)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.430 (10.92)
MAX
0.005 (0.13)
MIN
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
0.070 (1.78)
0.060 (1.52)
0.045 (1.14)
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-001
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 32. 8-Lead Plastic Dual In-Line Package [PDIP]
Figure 34. 8-Lead Standard Small Outline Package [SOIC_N]
(N-8)
P-Suffix
Narrow Body
(R-8)
S-Suffix
Dimensions shown in inches and (millimeters)
Dimensions shown in millimeters and (inches)
3.10
3.00
2.90
8
5
4
4.50
4.40
4.30
6.40 BSC
1
PIN 1
0.65 BSC
0.15
0.05
1.20
MAX
8°
0°
0.75
0.60
0.45
0.30
0.19
SEATING
PLANE
COPLANARITY
0.10
0.20
0.09
COMPLIANT TO JEDEC STANDARDS MO-153-AA
Figure 33. 8-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-8)
Dimensions shown in millimeters
Rev. I | Page 25 of 28
REF19x Series
ORDERING GUIDE
Model
REF191ES
REF191ES-REEL
REF191ESZ1
REF191ESZ-REEL1
REF191GP
REF191GPZ1
REF191GS
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
−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
−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
−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
−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
−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
−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
−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
−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
−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
−40°C to +85°C
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead PDIP
Package Option
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
P-Suffix (N-8)
P-Suffix (N-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
P-Suffix (N-8)
P-Suffix (N-8)
RU-8
Minimum Quantities/Reel
2500
2500
8-Lead PDIP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead PDIP
REF191GS-REEL
REF191GSZ1
REF191GSZ-REEL1
2500
2500
REF192ES
REF192ES-REEL
REF192ES-REEL7
REF192ESZ1
REF192ESZ-REEL1
REF192ESZ-REEL71
REF192FS
REF192FS-REEL
REF192FS-REEL7
REF192FSZ1
REF192FSZ-REEL1
REF192FSZ-REEL71
REF192GP
REF192GPZ1
REF192GRU
REF192GRU-REEL7
REF192GRUZ1
REF192GRUZ-REEL71
REF192GS
REF192GS-REEL
REF192GS-REEL7
REF192GSZ1
REF192GSZ-REEL1
REF192GSZ-REEL71
REF193GS
2500
1000
2500
1000
2500
1000
2500
1000
8-Lead PDIP
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead PDIP
RU-8
RU-8
RU-8
1000
1000
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
P-Suffix (N-8)
P-Suffix (N-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
2500
1000
2500
1000
REF193GS-REEL
REF193GSZ1
REF193GSZ-REEL1
2500
2500
2500
2500
REF194ES
REF194ES-REEL
REF194ESZ1
REF194ESZ-REEL1
REF194FS
REF194FSZ1
REF194GP
REF194GPZ1
REF194GS
8-Lead PDIP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
REF194GS-REEL
REF194GS-REEL7
REF194GSZ1
2500
1000
REF194GSZ-REEL1
2500
Rev. I | Page 26 of 28
REF19x Series
Model
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
−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
−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
−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
−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
−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
−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
−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
−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
−40°C to +85°C
−40°C to +85°C
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead PDIP
Package Option
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
P-Suffix (N-8)
P-Suffix (N-8)
RU-8
RU-8
RU-8
RU-8
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
RU-8
Minimum Quantities/Reel
REF194GSZ-REEL71
1000
REF195ES
REF195ES-REEL
REF195ESZ1
REF195ESZ-REEL1
2500
2500
2500
2500
REF195FS
REF195FS-REEL
REF195FSZ1
REF195FSZ-REEL1
REF195GP
REF195GPZ1
8-Lead PDIP
REF195GRU
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead TSSOP
8-Lead TSSOP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead PDIP
REF195GRU-REEL7
REF195GRUZ1
REF195GRUZ-REEL71
REF195GS
REF195GS-REEL
REF195GS-REEL7
REF195GSZ1
REF195GSZ-REEL1
REF195GSZ-REEL71
REF196GRU-REEL7
REF196GRUZ-REEL71
REF196GS
REF196GS-REEL
REF196GSZ1
REF196GSZ-REEL1
REF196GSZ-REEL71
REF198ES
REF198ES-REEL
REF198ESZ1
REF198ESZ-REEL1
REF198ESZ-REEL71
REF198FS
1000
1000
2500
1000
2500
1000
1000
1000
RU-8
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
P-Suffix (N-8)
P-Suffix (N-8)
RU-8
RU-8
RU-8
RU-8
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
S-Suffix (R-8)
2500
2500
1000
2500
2500
1000
REF198FS-REEL
REF198FSZ1
REF198FSZ-REEL1
REF198GP
REF198GPZ1
2500
2500
8-Lead PDIP
REF198GRU
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead TSSOP
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
REF198GRU-REEL7
REF198GRUZ1
REF198GRUZ-REEL71
REF198GS
REF198GS-REEL
REF198GSZ1
REF198GSZ-REEL1
1000
2500
2500
2500
1 Z = Pb-free part.
Rev. I | Page 27 of 28
REF19x Series
NOTES
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners
C00371-0-10/06(I)
Rev. I | Page 28 of 28
相关型号:
REF198FS3
REF19x Series: Precision Micropower. Low Dropout. Low Voltage References Data Sheet (Rev. E. 1/03)
ETC
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