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Linear Technology Electronic Components Datasheet

LM399A Datasheet

Precision Reference

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LM199/LM399
LM199A/LM399A
Precision Reference
Features
nn 6.95V Shunt Reference
nn Guaranteed 0.5ppm/°C Temperature Coefficient
nn Guaranteed 1Ω Maximum Dynamic Impedance
nn Guaranteed 20µVRMS Maximum Noise
nn Guaranteed Initial Tolerance of 2%
nn Wide Operating Current Range
nn Available in 4-Lead TO-46 Metal Can
Applications
nn Precision Voltage Reference for Multimeters
nn Calibration Equipment Voltage Standards
nn Laboratory Measurement Equipment
nn Industrial Monitor/Control Instruments
nn High Accuracy Data Converters
Description
The LM199/LM399 precision shunt reference features
excellent temperature stability over a wide range of volt-
age, 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.
Ideal applications for the LM199/LM399 include digital volt-
meters, precision calibration equipment, current sources
and a variety of other precision low cost references. A 10V
buffered reference application is shown below.
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
15V
7.5k
5%
9k
0.1%
+3
1
LM399H
6.95V
4
2
2
7
6
LT®1001
10V
3+
4
20k
0.1%
LM199 TA01a
Reverse Voltage Change
8
7
6
5
STABILIZED
(TJ ≈ 90°C)
4
TJ = 25°C
3
2
1
0
0
2
4
6
8
10
REVERSE CURRENT (mA)
LM199 TA01b
For more information www.linear.com/LM399
199399fc
1


Linear Technology Electronic Components Datasheet

LM399A Datasheet

Precision Reference

No Preview Available !

LM199/LM399
LM199A/LM399A
Absolute Maximum Ratings
(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
Pin Configuration
TOP VIEW
+1
4
H
2
3+
H PACKAGE
4-LEAD TO-46 METAL CAN
INSIDE THERMAL SHIELD
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LM399H
LM399H#TRPBF
LM399H
4-Lead TO-46 Metal Can
LM399AH
LM399AH#TRPBF
LM399AH
4-Lead TO-46 Metal Can
OBSOLETE PACKAGE
LM199H
LM199H#TRPBF
4-Lead TO-46 Metal Can
LM199AH
LM199AH#TRPBF
4-Lead TO-46 Metal Can
LM199AH-20
LM199AH-20#TRPBF
4-Lead TO-46 Metal Can
LM399AH-20
LM399AH-20#TRPBF
4-Lead TO-46 Metal Can
LM399AH-50
LM399AH-50#TRPBF
4-Lead TO-46 Metal Can
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/
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
0°C to 70°C
0°C to 70°C
ELECTRICAL Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
LM199/LM199A
LM399/LM399A
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX
UNITS
VZ
Reverse Breakdown Voltage
0.5mA ≤ IR ≤ 10mA
l 6.8 6.95 7.1 6.75 6.95 7.3
V
ΔVZ
Reverse Breakdown Voltage Change 0.5mA ≤ IR ≤ 10mA
with Current
l
6
9
6 12
mV
rZ
ΔVZ
ΔTemp
Reverse Dynamic Impedance
Temperature Coefficient
LM199/LM399
IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz) l
–55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
0.5 1
0.3 1
5 15
0.5 1.5
0.3 2
Ω
ppm/°C
ppm/°C
ppm/°C
LM199A/LM399A
en
RMS Noise
–55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
10Hz ≤ f ≤ 10kHz
0.2 0.5
5 10
l
7 20
0.3 1
ppm/°C
ppm/°C
ppm/°C
7 50
µV
199399fc
2
For more information www.linear.com/LM399


Part Number LM399A
Description Precision Reference
Maker Linear Technology
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LM399A Datasheet PDF






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