LM199/LM399
LM199A/LM399A
Precision Reference
Features
Description
6.95V Shunt Reference
Guaranteed 0.5ppm/°C Temperature Coefficient
nn Guaranteed 1Ω Maximum Dynamic Impedance
nn Guaranteed 20µV
RMS Maximum Noise
nn Guaranteed Initial Tolerance of 2%
nn Wide Operating Current Range
nn Available in 4-Lead TO-46 Metal Can
The LM199/LM399 precision shunt reference features
excellent temperature stability over a wide range of voltage, temperature and operating current conditions. A
stabilizing heater is incorporated with the active Zener on
a monolithic substrate which nearly eliminates changes in
voltage with temperature. The subsurface Zener operates
over a current range of 0.5mA to 10mA, and offers minimal
noise and excellent long-term stability.
Applications
Ideal applications for the LM199/LM399 include digital voltmeters, precision calibration equipment, current sources
and a variety of other precision low cost references. A 10V
buffered reference application is shown below.
nn
nn
Precision Voltage Reference for Multimeters
Calibration Equipment Voltage Standards
nn Laboratory Measurement Equipment
nn Industrial Monitor/Control Instruments
nn High Accuracy Data Converters
nn
nn
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
10V Buffered Reference
7.5k
5%
+
1
3
2
LM399H
6.95V
–
3
20k
0.1%
4
8
9k
0.1%
–
7
LT®1001
6
+
4
2
LM199 TA01a
10V
REVERSE VOLTAGE CHANGE (mV)
15V
Reverse Voltage Change
7
6
5
STABILIZED
(TJ ≈ 90°C)
4
TJ = 25°C
3
2
1
0
0
2
4
8
6
REVERSE CURRENT (mA)
10
LM199 TA01b
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For more information www.linear.com/LM399
1
LM199/LM399
LM199A/LM399A
Absolute Maximum Ratings
Pin Configuration
(Note 1)
Temperature Stabilizer...............................................40V
Reverse Breakdown Current....................................20mA
Forward Current........................................................1mA
Reference to Substrate Voltage, VRS (Note 2)......... –0.1V
Operating Temperature Range
LM199/LM199A (OBSOLETE)............. –55°C to 125°C
LM399/LM399A....................................... 0°C to 70°C
Storage Temperature Range
LM199/LM199A (OBSOLETE)............. –65°C to 150°C
LM399/LM399A................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
TOP VIEW
+
1
4
–
3
+
H
–
2
H PACKAGE
4-LEAD TO-46 METAL CAN
INSIDE THERMAL SHIELD
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LM399H
LM399H#TRPBF
LM399H
4-Lead TO-46 Metal Can
0°C to 70°C
LM399AH
LM399AH#TRPBF
LM399AH
4-Lead TO-46 Metal Can
0°C to 70°C
OBSOLETE PACKAGE
LM199H
LM199H#TRPBF
4-Lead TO-46 Metal Can
–55°C to 125°C
LM199AH
LM199AH#TRPBF
4-Lead TO-46 Metal Can
–55°C to 125°C
LM199AH-20
LM199AH-20#TRPBF
4-Lead TO-46 Metal Can
–55°C to 125°C
LM399AH-20
LM399AH-20#TRPBF
4-Lead TO-46 Metal Can
0°C to 70°C
LM399AH-50
LM399AH-50#TRPBF
4-Lead TO-46 Metal Can
0°C to 70°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL PARAMETER
Reverse Breakdown Voltage
VZ
l
LM199/LM199A
MIN
TYP
MAX
6.8
6.95
7.1
LM399/LM399A
MIN
TYP
MAX
6.75
6.95
7.3
l
6
9
6
12
mV
IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz) l
0.5
1
0.5
1.5
Ω
–55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
0.3
5
1
15
–55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
0.2
5
0.5
10
7
20
CONDITIONS
0.5mA ≤ IR ≤ 10mA
ΔVZ
Reverse Breakdown Voltage Change 0.5mA ≤ IR ≤ 10mA
with Current
rZ
Reverse Dynamic Impedance
ΔVZ
ΔTemp
Temperature Coefficient
LM199/LM399
LM199A/LM399A
en
RMS Noise
10Hz ≤ f ≤ 10kHz
l
UNITS
V
2
ppm/°C
ppm/°C
ppm/°C
0.3
1
ppm/°C
ppm/°C
ppm/°C
7
50
µV
0.3
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2
For more information www.linear.com/LM399
LM199/LM399
LM199A/LM399A
ELECTRICAL Characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL PARAMETER
Long-Term Stability
ΔVZ
ΔTime
Temperature Stabilizer Supply
IH
Current
LM199/LM199A
LM399/LM399A
MIN
TYP
MAX MIN
TYP
MAX
UNITS
8 (Note 4)
8 (Note 4) ppm/√kH
CONDITIONS
Stabilized, 22°C ≤ TA ≤ 28°C,
1000 Hours, IR = 1mA ±0.1%
TA = 25°C, Still Air, VH = 30V
TA = –55°C (Note 5)
8.5
22
Temperature Stabilizer Supply
Voltage
VH
l
Warm-Up Time to ±0.05% VZ
VH = 30V
Initial Turn-On Current
9V ≤ VH ≤ 40V (Note 5)
14
28
9
8.5
40
9
3
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The substrate is electrically connected to the negative terminal
of the temperature stabilizer. The voltage that can be applied to either
terminal of the reference is 40V more positive or 0.1V more negative than
the substrate.
15
mA
40
V
3
140
200
140
Seconds
200
mA
Note 3: These specifications apply for 30V applied to the temperature
stabilizer and –55°C ≤ TA ≤ 125°C for the LM199; and 0°C ≤ TA ≤ 70°C for
the LM399.
Note 4: Devices with maximum guaranteed long-term stability of
20ppm/√kH are available. Drift decreases with time.
Note 5: This initial current can be reduced by adding an appropriate
resistor and capacitor to the heater circuit. See the Typical Performance
Characteristics graphs to determine values.
Note 6: Guaranteed by “Reverse Breakdown Change with Current.”
Typical Performance Characteristics
Reverse Characteristics
Dynamic Impedance
1
TJ = 25°C
0.01
6.25
STABILIZED
(TJ ≈ 90°C)
6.85
6.45
6.65
REVERSE VOLTAGE (V)
7.05
LM199 G01
1
VH = 15V
TA = 25°C
0
10
OUTPUT (mV)
DYNAMIC IMPEDANCE (Ω)
REVERSE CURRENT (mA)
10
0.1
Stabilization Time
100
100
STABILIZED
(TJ ≈ 90°C)
1
TA = –55°C
–1
–2
TJ = 25°C
–3
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
LM199 G02
–4
0
4
12
16
8
HEATER ON TIME (SECONDS)
20
LM199 G03
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For more information www.linear.com/LM399
3
LM199/LM399
LM199A/LM399A
Typical Performance Characteristics
Initial Heater Current
Heater Current
Heater Current
160
80
VH = 40V
200
150
100
HEATER CURRENT (mA)
60
VH = 10V
40
VH = 20V
VH = 30V
20
50
0
–55 –35 –15 5 25 45 65 85 105 125
TURN ON TEMPERATURE (°C)
0
25 45 65
–55 –35 –15 5
TEMPERATURE (°C)
LM199 G04
85
105
6
STABILIZED
(TJ ≈ 90°C)
5
VOLTAGE SWING (V)
STABILIZED
(TJ ≈ 90°C)
4
TJ = 25°C
2
7.5k
1
INPUT
0
OUTPUT
20
INPUT
10
0
1k
10k
FREQUENCY (Hz)
VH = 30V
VH = 40V
0
2
4
6 8 10 12 14 16 18
TIME (SECONDS)
Limiting Surge Current
3
TJ = 25°C
100
VH = 20V
40
LM199 G06
OUTPUT
7
150
VH = 10V
60
Response Time
8
10
80
0
MAXIMUM SURGE LIMITING RESISTOR (Ω)
Zener Noise Voltage
50
100
LM199 G05
200
100
120
20
VH = 40V
NOISE (nV/√Hz)
TA = 25°C
140
HEATER CURRENT (mA)
INITIAL HEATER CURRENT (mA)
250
100k
0
100
200
TIME (µs)
300
LM199 G07
800
700
600
500
400
300
200
100
0
400
25°C (46mA)
5°C (60mA)
–15°C (71mA)
–35°C (87mA)
–55°C (105mA)
0
20
10
30
MINIMUM SUPPLY VOLTAGE (V)
40
HEATER MUST BE BYPASSED WITH A 2µF OR LARGER
TANTALUM CAPACITOR IF RESISTORS ARE USED
LM199 G08
LM199 G09
Long-Term Reference
Performance, 44 Units Tested
Low Frequency Noise Voltage
12
NOISE(10µV/DIV)
DRIFT (ppm)
10
8
3 SIGMA
6
4
MEAN
2
0
2
4
6
8
MONTHS
10
12
0
LM199 G10
50
150
100
TIME (SECONDS)
200
250
LM199 G11
199399fc
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For more information www.linear.com/LM399
LM199/LM399
LM199A/LM399A
Functional Block Diagram
+
3
1
+
H
–
–
4
2
LT199 FD
Typical Applications
Single Supply Operation
Negative Heater Supply with
Positive Reference
Split Supply Operation
9V TO 40V
15V
15V
RS
7.5k
+
7.5k
+
+
LM399
LM399
LM399
6.95V
6.95V
6.95V
–
–
LM199 TA02
–9V TO –33V
–15V
–
LM199 TA04
LM199 TA03
Standard Cell Replacement
15V TO 20V
1% REGULATED
1µF
7.5k
+
–
1
3
4
OUTPUT
ADJUST
LM199A
12k
0.1%
6.95V
20k
2
2k
0.1%
22k
2
–
2k 3
+
100k
2M
7
LT1001AC
6
OUTPUT
4
1µF
LM199 TA05
199399fc
For more information www.linear.com/LM399
5
LM199/LM399
LM199A/LM399A
Typical Applications
Portable Calibrator
8.8k
1%
2
200k
+
12V TO
18V
3
7
–
LT1001AC
+
6
OUTPUT
10V
4
5k
+
19k
1%
LM399
6.95V
3k
TRIM
–
LM199 TA06
Schematic Diagrams
Temperature Stabilizer
Reference
3
1
Q9
Q5
Q2
+
Q8
Q6
Q1
2k
2k
4.2Ω
Q15
Q14
15pF
Q7
10pF
1k
Q3
6.3V
50Ω Q10
+
Q12
2k
30pF
Q13
11.2k
D1
6.3V
Q3 Q4
D2
6.3V
Q16
10k
2k
Q11
2.6k
30k
1k
LM199 SD01
4
–
LM199 SD02
2
–
199399fc
6
For more information www.linear.com/LM399
LM199/LM399
LM199A/LM399A
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
H Package
4-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1341)
Thermal Shield* for TO-46, H Package
.400 – .420
(10.160 – 10.668)
DIA
.209 – .219
(5.309 – 5.563)
.085 – .105
(2.159 – 2.667)
.178 – .195
(4.521 – 4.953)
REFERENCE
PLANE
.500
(12.700)
MIN
.025
(0.635)
MAX
SEATING*
PLANE
.016 – .019**
(0.406 – 0.483)
DIA
.050
(1.270)
TYP
.100
(2.540)
TYP
.225 – .240
(5.715 – 6.096)
SEATING
PLANE
.450
REF
(11.430)
.016 – .019
(0.406 – 0.483)
TYP DIA
.100
(2.540)
.050
(1.270)
.050
(1.270)
TYP
PIN 1
*THERMAL SHIELD MATERIAL IS VALOX
.036 – .046
(0.914 – 1.168)
45
.028 – .048
(0.711 – 1.219)
H4(TO-46) 0801
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND .050" BELOW THE REFERENCE PLANE
.016 – .024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
Revision History
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
C
12/14
Package/Order Information updated
PAGE NUMBER
2
Thermal shield dimensions corrected
7
199399fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representaFor ofmore
information
www.linear.com/LM399
tion that the interconnection
its circuits
as described
herein will not infringe on existing patent rights.
7
LM199/LM399
LM199A/LM399A
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LT®1021
Precision References for Series or Shunt Operation
Industry Standard Pinout, –40°C to 125°C
LT1389
1.25V, 2.5V, 4V and 5V Nanopower Shunt Reference
800nA, 0.05% Accuracy, 10ppm/°C Drift
LT1634
1.25 and 2.5V Micropower Shunt Reference
0.05%, 10ppm/°C, 10µA Current
LTZ1000
7V Ultra Precision, Stable Shunt Reference
0.05ppm/°C, 1.2mVP-P Noise
199399fc
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LM399
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com/LM399
LT 1214 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1987