LM199/LM399
LM199A/LM399A
1
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Precision Reference
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.
■ Precision Voltage Reference for Multimeters
■ Calibration Equipment Voltage Standards
■ Laboratory Measurement Equipment
■ Industrial Monitor/Control Instruments
■ High Accuracy Data Converters
■ 6.95V Shunt Reference
■ Guaranteed 0.5ppm/°C Temperature Coeffi cient
■ Guaranteed 1Ω Maximum Dynamic Impedance
■ Guaranteed 20µVRMS Maximum Noise
■ Guaranteed Initial Tolerance of 2%
■ Wide Operating Current Range
■ Available in 4-Lead TO-46 Metal Can
10V Buffered Reference
APPLICATIO S
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FEATURES DESCRIPTIO
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TYPICAL APPLICATIO
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, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
9k
0.1%
7.5k
5%
3
+
–
1
42
6.95V
15V
LM399H
20k
0.1%
27
4
610V
3
LM199 TA01a
–
+
LT®1001
REVERSE CURRENT (mA)
0
REVERSE VOLTAGE CHANGE (mV)
3
4
5
610
LM199 TA01b
2
1
024 8
6
7
8
STABILIZED
(TJ ≈ 90°C)
TJ = 25°C
Reverse Voltage Change
LM199/LM399
LM199A/LM399A
2
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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
(Note 1)
The
● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at TA = 25°C. (Note 3)
LM199/LM199A LM399/LM399A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
VZReverse Breakdown Voltage 0.5mA ≤ IR ≤ 10mA ●6.8 6.95 7.1 6.75 6.95 7.3 V
ΔVZReverse Breakdown Voltage Change
with Current
0.5mA ≤ IR ≤ 10mA ●69 612 mV
rZReverse Dynamic Impedance IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz) ●0.5 1 0.5 1.5 Ω
ΔVZ
ΔTemp
Temperature Coeffi cient
LM199/LM399 –55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
0.3
5
1
15
0.3 2
ppm/°C
ppm/°C
ppm/°C
LM199A/LM399A –55°C ≤ TA ≤ 85°C
85°C ≤ TA ≤ 125°C
0°C ≤ TA ≤ 70°C
0.2
5
0.5
10
0.3 1
ppm/°C
ppm/°C
ppm/°C
enRMS Noise 10Hz ≤ f ≤ 10kHz ●7 20 7 50 µV
ΔVZ
ΔTime
Long-Term Stability Stabilized, 22°C ≤ TA ≤ 28°C,
1000 Hours, IR = 1mA ±0.1%
8 (Note 4) 8 (Note 4) ppm/√kH
IHTemperature Stabilizer Supply Current TA = 25°C, Still Air, VH = 30V
TA = –55°C (Note 5)
8.5
22
14
28
8.5 15 mA
VH Temperature Stabilizer Supply Voltage ●9 40 9 40 V
Warm-Up Time to ±0.05% VZVH = 30V 3 3 Seconds
Initial Turn-On Current 9V ≤ VH ≤ 40V (Note 5) 140 200 140 200 mA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
TOP VIEW
+1
H PACKAGE
4-LEAD TO-46 METAL CAN
INSIDE THERMAL SHIELD
–
4
2
–3+
H
ORDER PART NUMBER
LM399H
LM399AH
LM199H
LM199AH
LM199AH-20
LM399AH-20
LM399AH-50
OBSOLETE
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LM199/LM399
LM199A/LM399A
3
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Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 specifi cations 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.
Reverse Characteristics Dynamic Impedance Stabilization Time
ELECTRICAL CHARACTERISTICS
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 PERFOR A CE CHARACTERISTICS
UW
HEATER ON TIME (SECONDS)
0
OUTPUT (mV)
–1
0
1
16
LM199 G03
–2
–3
–4 4812 20
TA = 25°C
VH = 15V
TA = –55°C
Initial Heater Current Heater Current Heater Current
TURN ON TEMPERATURE (°C)
–55
0
INITIAL HEATER CURRENT (mA)
50
150
200
250
–15 25 45 125
LM199 G04
100
–35 5 65 85 105
VH = 40V
TEMPERATURE (°C)
–55
HEATER CURRENT (mA)
40
60
105
LM199 G05
20
0–15 25 65
–35 545 85
80
VH = 10V
VH = 20V
VH = 40V
VH = 30V
TIME (SECONDS)
0
HEATER CURRENT (mA)
160
140
120
100
80
60
40
20
0
16
LM199 G06
4 8 12 142 6 10 18
VH = 10V
VH = 20V
TA = 25°C
VH = 30V
VH = 40V
REVERSE VOLTAGE (V)
6.25
0.01
REVERSE CURRENT (mA)
0.1
1
10
100
6.45 6.65
LM199 G01
6.85 7.05
TJ = 25°C
STABILIZED
(TJ ≈ 90°C)
FREQUENCY (Hz)
10
0.1
DYNAMIC IMPEDANCE (Ω)
10
100
100 1k 10k 100k
LM199 G02
1TJ = 25°C
STABILIZED
(TJ ≈ 90°C)
LM199/LM399
LM199A/LM399A
4
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Zener Noise Voltage Response Time Limiting Surge Current
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FREQUENCY (Hz)
10
50
100
150
200
100 1k 10k 100k
LM199 G07
NOISE (nV/√Hz)
TJ = 25°C
STABILIZED
(TJ ≈ 90°C)
TIME (µs)
0
VOLTAGE SWING (V)
2
4
6
8
400
LM199 G08
0
10
1
3
5
7
20
0
100 200 300
TJ = 25°C
OUTPUT
INPUT
STABILIZED
(TJ ≈ 90°C)
INPUT
OUTPUT
7.5k
MINIMUM SUPPLY VOLTAGE (V)
0
MAXIMUM SURGE LIMITING RESISTOR (Ω)
400
600
40
LM199 G09
200
010 20 30
800
25°C (46mA)
5°C (60mA)
–15°C (71mA)
–35°C (87mA)
–55°C (105mA)
300
500
100
700
HEATER MUST BE BYPASSED WITH A 2µF OR LARGER
TANTALUM CAPACITOR IF RESISTORS ARE USED
Long-Term Reference
Performance, 44 Units Tested Low Frequency Noise Voltage
MONTHS
2
0
DRIFT (ppm)
2
4
6
8
10
12
46810
LM199 G10
12
3 SIGMA
MEAN
TIME (SECONDS)
0
NOISE(10µV/DIV)
200
LM199 G11
50 100 150 250
LM199/LM399
LM199A/LM399A
5
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FU CTIO AL BLOCK DIAGRA
WUU
24
13
H
+
–
+
–
LT199 FD
TYPICAL APPLICATIO S
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Single Supply Operation Split Supply Operation Negative Heater Supply with
Positive Reference
RS
+
–
6.95V
LM199 TA02
9V TO 40V
LM399
7.5k
+
–
6.95V
LM199 TA03
15V
–15V
LM399
7.5k
+
–
6.95V
LM199 TA04
15V
–9V TO –33V
LM399
Standard Cell Replacement
7.5k
2M OUTPUT
1µF
1µF
2k
2
3
7
4
6
20k
22k
12k
0.1%
OUTPUT
ADJUST
2k
0.1%
3
+
–
1
42
6.95V
15V TO 20V
1% REGULATED
LM199A
LM199 TA05
–
+
LT1001AC
100k
LM199/LM399
LM199A/LM399A
6
LM199399fb
Q5
11.2k
2k
D1
6.3V
D2
6.3V
1k4.2Ω
Q6
Q2
Q1
Q9
Q8
+
–
Q7
Q4
LM199 SD01
2k
10pF
Q3
3
4
Q3
6.3V
50Ω
30k
2k 2.6k
Q10
Q11
Q13
Q14
Q15
15pF 2k
10k
Q12
Q16
1k
+
–
LM199 SD02
1
2
30pF
TYPICAL APPLICATIO S
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Portable Calibrator
200k
OUTPUT
10V
8.8k
1%
2
3
4
7
6
5k
3k
TRIM
19k
1%
+
–
6.95V
12V TO
18V
LM199 TA06
LM399
+–
+
LT1001AC
SCHE ATIC DIAGRA S
WW
Temperature Stabilizer Reference
LM199/LM399
LM199A/LM399A
7
LM199399fb
PACKAGE DESCRIPTIO
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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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
H Package
4-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1341)
.016 – .019**
(0.406 – 0.483)
DIA
.025
(0.635)
MAX
REFERENCE
PLANE
.085 – .105
(2.159 – 2.667)
.500
(12.700)
MIN
.178 – .195
(4.521 – 4.953)
.209 – .219
(5.309 – 5.563)
.100
(2.540)
TYP
45°
H4(TO-46) 0801
.050
(1.270)
TYP
.050
(1.270)
TYP
.028 – .048
(0.711 – 1.219)
.036 – .046
(0.914 – 1.168)
SEATING*
PLANE
LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND .050" BELOW THE REFERENCE PLANE
FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS .016 – .024
(0.406 – 0.610)
*
**
PIN 1
.399 – .409
(10.135 – 10.389)
DIA
.016 – .019
(0.406 – 0.483)
TYP DIA
.100
(2.540)
.244 – .234
(5.690 – 5.943)
.400
(10.160)
.050
(1.270)
SEATING
PLANE
Thermal Shield* for TO-46, H Package
* THERMAL SHIELD MATERIAL IS VALOXTM.
VALOX IS A TRADEMARK OF GENERAL ELECTRIC
LM199/LM399
LM199A/LM399A
8
LM199399fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 1987
LT 1005 REV B • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LT1021 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
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