LM199/LM399
LM199A/LM399A
Precision Reference
FeaTures
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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.
6.95V Shunt Reference
Guaranteed 0.5ppm/°C Temperature Coefficient
Guaranteed 1Ω Maximum Dynamic Impedance
Guaranteed 20µV
RMS
Maximum Noise
Guaranteed Initial Tolerance of 2%
Wide Operating Current Range
Available in 4-Lead TO-46 Metal Can
applicaTions
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Precision Voltage Reference for Multimeters
Calibration Equipment Voltage Standards
Laboratory Measurement Equipment
Industrial Monitor/Control Instruments
High Accuracy Data Converters
Typical applicaTion
10V Buffered Reference
15V
7.5k
5%
9k
0.1%
2
7
®
Reverse Voltage Change
8
REVERSE VOLTAGE CHANGE (mV)
7
6
5
4
3
2
1
0
0
2
4
8
6
REVERSE CURRENT (mA)
10
LM199 TA01b
LM399H
6.95V
3
20k
0.1%
4
2
–
+
–
+
3
1
LT 1001
4
6
10V
STABILIZED
(T
J
≈ 90°C)
T
J
= 25°C
LM199 TA01a
199399fc
For more information
www.linear.com/LM399
1
LM199/LM399
LM199A/LM399A
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
Temperature Stabilizer ..............................................40V
Reverse Breakdown Current...................................20mA
Forward Current .......................................................1mA
Reference to Substrate Voltage, V
RS
(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
+
–
1
H
2
4
–
+
3
H PACKAGE
4-LEAD TO-46 METAL CAN
INSIDE THERMAL SHIELD
orDer inForMaTion
LEAD FREE FINISH
LM399H
LM399AH
LM199H
LM199AH
LM199AH-20
LM399AH-20
LM399AH-50
TAPE AND REEL
LM399H#TRPBF
LM399AH#TRPBF
LM199H#TRPBF
LM199AH#TRPBF
LM199AH-20#TRPBF
LM399AH-20#TRPBF
LM399AH-50#TRPBF
PART MARKING
LM399H
LM399AH
PACKAGE DESCRIPTION
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
4-Lead TO-46 Metal Can
OBSOLETE PACKAGE
–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
TEMPERATURE RANGE
0°C to 70°C
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
SYMBOL PARAMETER
Reverse Breakdown Voltage
V
Z
ΔV
Z
r
Z
ΔV
Z
ΔTemp
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
0.5mA ≤ I
R
≤ 10mA
LM199/LM199A
MIN
TYP
MAX
6.8
6.95
7.1
6
0.5
0.3
5
0.2
5
l
l
l
LM399/LM399A
MIN
TYP
MAX
6.75
6.95
7.3
6
0.5
12
1.5
UNITS
V
mV
Ω
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
µV
199399fc
Reverse Breakdown Voltage Change 0.5mA ≤ I
R
≤ 10mA
with Current
Reverse Dynamic Impedance
Temperature Coefficient
LM199/LM399
9
1
1
15
0.5
10
20
I
R
= 1mA (Note 6) (10Hz ≤ f ≤ 100Hz)
l
–55°C ≤ T
A
≤ 85°C
85°C ≤ T
A
≤ 125°C
0°C ≤ T
A
≤ 70°C
–55°C ≤ T
A
≤ 85°C
85°C ≤ T
A
≤ 125°C
0°C ≤ T
A
≤ 70°C
10Hz ≤ f ≤ 10kHz
0.3
2
LM199A/LM399A
0.3
7
1
50
e
n
RMS Noise
7
2
For more information
www.linear.com/LM399
LM199/LM399
LM199A/LM399A
elecTrical characTerisTics
SYMBOL PARAMETER
Long-Term Stability
ΔV
Z
ΔTime
Temperature Stabilizer Supply
I
H
Current
V
H
Temperature Stabilizer Supply
Voltage
Warm-Up Time to ±0.05% V
Z
Initial Turn-On Current
V
H
= 30V
9V ≤ V
H
≤ 40V (Note 5)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
CONDITIONS
Stabilized, 22°C ≤ T
A
≤ 28°C,
1000 Hours, I
R
= 1mA ±0.1%
T
A
= 25°C, Still Air, V
H
= 30V
T
A
= –55°C (Note 5)
l
LM199/LM199A
LM399/LM399A
MIN
TYP
MAX MIN
TYP
MAX
UNITS
8 (Note 4)
8 (Note 4) ppm/√kH
8.5
22
9
3
140
200
14
28
40
9
3
140
200
8.5
15
40
mA
V
Seconds
mA
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.
Note 3:
These specifications apply for 30V applied to the temperature
stabilizer and –55°C ≤ T
A
≤ 125°C for the LM199; and 0°C ≤ T
A
≤ 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
100
100
Dynamic Impedance
1
Stabilization Time
V
H
= 15V
T
A
= 25°C
T
A
= –55°C
REVERSE CURRENT (mA)
10
DYNAMIC IMPEDANCE ( )
0
OUTPUT (mV)
T
J
= 25°C
–3
10
STABILIZED
(T
J
≈ 90°C)
1
–1
1
T
J
= 25°C
0.1
STABILIZED
(T
J
≈ 90°C)
6.85
6.45
6.65
REVERSE VOLTAGE (V)
7.05
LM199 G01
–2
0.01
6.25
0.1
10
100
1k
10k
FREQUENCY (Hz)
100k
LM199 G02
–4
0
4
12
16
8
HEATER ON TIME (SECONDS)
20
LM199 G03
199399fc
For more information
www.linear.com/LM399
3
LM199/LM399
LM199A/LM399A
Typical perForMance characTerisTics
Initial Heater Current
250
INITIAL HEATER CURRENT (mA)
200
HEATER CURRENT (mA)
V
H
= 40V
80
Heater Current
160
140
HEATER CURRENT (mA)
60
V
H
= 10V
V
H
= 20V
V
H
= 30V
120
100
80
60
40
20
85
105
0
Heater Current
T
A
= 25°C
150
40
100
50
0
–55 –35 –15 5 25 45 65 85 105 125
TURN ON TEMPERATURE (°C)
LM199 G04
V
H
= 10V
V
H
= 20V
V
H
= 30V
20
V
H
= 40V
0
25 45 65
–55 –35 –15 5
TEMPERATURE (°C)
V
H
= 40V
0
2
4
6 8 10 12 14 16 18
TIME (SECONDS)
LM199 G06
LM199 G05
Zener Noise Voltage
200
8
7
6
VOLTAGE SWING (V)
5
4
3
2
1
0
20
10
0
50
10
100
1k
10k
FREQUENCY (Hz)
100k
LM199 G07
Response Time
MAXIMUM SURGE LIMITING RESISTOR ( )
OUTPUT
STABILIZED
(T
J
≈ 90°C)
T
J
= 25°C
Limiting Surge Current
800
700
600
500
400
300
200
100
0
0
20
10
30
MINIMUM SUPPLY VOLTAGE (V)
40
25°C (46mA)
5°C (60mA)
–15°C (71mA)
–35°C (87mA)
–55°C (105mA)
NOISE (nV/√Hz)
150
7.5k
INPUT
OUTPUT
100
STABILIZED
(T
J
≈ 90°C)
T
J
= 25°C
INPUT
0
100
200
TIME (µs)
300
400
LM199 G08
HEATER MUST BE BYPASSED WITH A 2µF OR LARGER
TANTALUM CAPACITOR IF RESISTORS ARE USED
LM199 G09
Long-Term Reference
Performance, 44 Units Tested
12
10
8
3 SIGMA
6
4
2
0
NOISE(10µV/DIV)
MEAN
Low Frequency Noise Voltage
DRIFT (ppm)
2
4
6
8
MONTHS
10
12
LM199 G10
0
50
150
100
TIME (SECONDS)
200
250
LM199 G11
199399fc
4
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
9V TO 40V
R
S
Split Supply Operation
15V
7.5k
Negative Heater Supply with
Positive Reference
15V
7.5k
+
LM399
6.95V
+
LM399
6.95V
+
LM399
6.95V
–
LM199 TA02
–
–15V
LM199 TA03
–9V TO –33V
–
LM199 TA04
Standard Cell Replacement
15V TO 20V
1% REGULATED
7.5k
OUTPUT
ADJUST
12k
0.1%
20k
2k
0.1%
100k
2M
2
2k 3
1µF
LM199 TA05
1µF
22k
7
6
OUTPUT
LM199A
6.95V
–
4
2
For more information
www.linear.com/LM399
+
–
+
3
1
LT1001AC
4
199399fc
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