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LM199/LM399 LM199A/LM399A Precision Reference DESCRIPTIO U
STABILIZED (TJ 90C) TJ = 25C 4 8 6 REVERSE CURRENT (mA) 10
LM199 TA01b
FEATURES

6.95V Shunt Reference Guaranteed 0.5ppm/C Temperature Coefficient Guaranteed 1 Maximum Dynamic Impedance Guaranteed 20VRMS Maximum Noise Guaranteed Initial Tolerance of 2% Wide Operating Current Range Available in 4-Lead TO-46 Metal Can
APPLICATIO S

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. 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.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Precision Voltage Reference for Multimeters Calibration Equipment Voltage Standards Laboratory Measurement Equipment Industrial Monitor/Control Instruments High Accuracy Data Converters
TYPICAL APPLICATIO
15V
10V Buffered Reference
9k 0.1% 8 REVERSE VOLTAGE CHANGE (mV) 7 6 5 4 3 2 1 0 0
7.5k 5%
LM399H 6.95V 3 20k 0.1%
-
4
2
LM199 TA01a
+
-
+
3
1
2
U
U
Reverse Voltage Change
7 6 10V
LT(R)1001 4
2
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LM199/LM399 LM199A/LM399A ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
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) ............ -55C to 125C LM399/LM399A ....................................... 0C to 70C Storage Temperature Range LM199/LM199A (OBSOLETE) ............ -65C to 150C LM399/LM399A ................................. -65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C
+
1 H
4
-
-
2
3
+
H PACKAGE 4-LEAD TO-46 METAL CAN INSIDE THERMAL SHIELD
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 specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VZ VZ rZ VZ Temp Reverse Breakdown Voltage Reverse Breakdown Voltage Change with Current Reverse Dynamic Impedance Temperature Coefficient LM199/LM399 CONDITIONS
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3)
LM199/LM199A MIN TYP MAX

LM399/LM399A MIN TYP MAX 6.75 6.95 6 0.5 7.3 12 1.5
UNITS V mV ppm/C ppm/C ppm/C ppm/C ppm/C ppm/C V
0.5mA IR 10mA 0.5mA IR 10mA
6.8
6.95 6 0.5 0.3 5 0.2 5
7.1 9 1 1 15
IR = 1mA (Note 6) (10Hz f 100Hz) -55C TA 85C 85C TA 125C 0C TA 70C -55C TA 85C 85C TA 125C 0C TA 70C 10Hz f 10kHz Stabilized, 22C TA 28C, 1000 Hours, IR = 1mA 0.1%
0.3 0.5 10 0.3 7 8 8.5 22
2
LM199A/LM399A
1 50
en VZ Time IH VH
RMS Noise Long-Term Stability
20 (Note 4) 14 28 40 9
7 8 8.5
(Note 4) ppm/kH 15 40 mA V Seconds 200 mA
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Temperature Stabilizer Supply Current TA = 25C, Still Air, VH = 30V TA = -55C (Note 5) Temperature Stabilizer Supply Voltage Warm-Up Time to 0.05% VZ Initial Turn-On Current VH = 30V 9V VH 40V (Note 5) 9
3 140 200
3 140
2
U
W
U
U
WW
W
LM199/LM399 LM199A/LM399A ELECTRICAL CHARACTERISTICS
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 specifications apply for 30V applied to the temperature stabilizer and -55C TA 125C for the LM199; and 0C TA 70C 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 PERFOR A CE CHARACTERISTICS
Reverse Characteristics
100 100
10
DYNAMIC IMPEDANCE ()
REVERSE CURRENT (mA)
OUTPUT (mV)
1 TJ = 25C 0.1 STABILIZED (TJ 90C) 0.01 6.25 6.85 6.45 6.65 REVERSE VOLTAGE (V) 7.05
LM199 G01
Initial Heater Current
250 INITIAL HEATER CURRENT (mA) VH = 40V 80
200 HEATER CURRENT (mA) HEATER CURRENT (mA) 60 120 100 80 60 VH = 20V 40 20 0 85 105 0 VH = 40V 2 4 6 8 10 12 14 16 18 TIME (SECONDS)
LM199 G06
150
100
50
0 -55 -35 -15 5 25 45 65 85 105 125 TURN ON TEMPERATURE (C)
LM199 G04
UW
Dynamic Impedance
1
Stabilization Time
VH = 15V TA = 25C TA = -55C -1
0 10 STABILIZED (TJ 90C) 1 TJ = 25C -3
-2
0.1 10 100 1k 10k FREQUENCY (Hz) 100k
LM199 G02
-4
0
4 12 16 8 HEATER ON TIME (SECONDS)
20
LM199 G03
Heater Current
160 140
Heater Current
TA = 25C
VH = 10V 40 VH = 20V 20 VH = 40V 0 25 45 65 -55 -35 -15 5 TEMPERATURE (C) VH = 30V
VH = 10V VH = 30V
LM199 G05
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LM199/LM399 LM199A/LM399A TYPICAL PERFOR A CE CHARACTERISTICS
Zener Noise Voltage
200 8 7 6 NOISE (nV/Hz) 150 VOLTAGE SWING (V) 5 4 3 2 1 0 20 10 0 50 10 100 1k 10k FREQUENCY (Hz) 100k
LM199 G07
MAXIMUM SURGE LIMITING RESISTOR ()
100
STABILIZED (TJ 90C) TJ = 25C
Long-Term Reference Performance, 44 Units Tested
12 10 NOISE(10V/DIV) 8 3 SIGMA 6 4 2 0 2 4 6 8 MONTHS 10 12
LM199 G10
DRIFT (ppm)
4
UW
Response Time
OUTPUT STABILIZED (TJ 90C) TJ = 25C 800 700 600 500 400 300 200 100 0
Limiting Surge Current
7.5k INPUT OUTPUT
25C (46mA) 5C (60mA) -15C (71mA) -35C (87mA) -55C (105mA)
INPUT
0
100 200 TIME (s)
300
400
LM199 G08
0
20 10 30 MINIMUM SUPPLY VOLTAGE (V)
40
HEATER MUST BE BYPASSED WITH A 2F OR LARGER TANTALUM CAPACITOR IF RESISTORS ARE USED
LM199 G09
Low Frequency Noise Voltage
MEAN
0
50
150 100 TIME (SECONDS)
200
250
LM199 G11
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LM199/LM399 LM199A/LM399A FU CTIO AL BLOCK DIAGRA W
3 1
TYPICAL APPLICATIO S
Single Supply Operation
9V TO 40V RS
+
LM399 6.95V
-
LM199 TA02
15V TO 20V 1% REGULATED 7.5k OUTPUT ADJUST 12k 0.1% 20k 2k 0.1% 100k 2M 2k 3 1F
LM199 TA05
LM199A 6.95V
-
4
2
+
-
U
U
U
+
H
+
-
4 2
-
LT199 FD
Split Supply Operation
15V 7.5k
Negative Heater Supply with Positive Reference
15V 7.5k
+
LM399 6.95V
+
LM399 6.95V
- -
-15V
LM199 TA03
-9V TO -33V
LM199 TA04
Standard Cell Replacement
1F 22k 2 7 6 OUTPUT
+
3
1
LT1001AC 4
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LM199/LM399 LM199A/LM399A TYPICAL APPLICATIO S
Portable Calibrator
8.8k 1% 2
SCHE ATIC DIAGRA S
Temperature Stabilizer
3 Q2 Q5 Q8 Q1 2k Q7 10pF 11.2k Q3 Q4 4.2 1k 4
LM199 SD01
Q6 Q12 15pF 2k Q13 10k 2k D1 6.3V D2 6.3V Q11 30k 30pF
6
W
U
+
200k 12V TO 18V
- +
7 6 OUTPUT 10V
LT1001AC 3 4 5k
+
LM399 6.95V 3k TRIM 19k 1%
-
LM199 TA06
W
Reference +
50 Q10 Q3 6.3V Q14 1k Q15 1
+
Q9
Q16
2k
2.6k
-
LM199 SD02
2
-
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LM199/LM399 LM199A/LM399A PACKAGE DESCRIPTIO
H Package 4-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1341)
.209 - .219 (5.309 - 5.563) .178 - .195 (4.521 - 4.953) .500 (12.700) MIN SEATING* PLANE .085 - .105 (2.159 - 2.667)
REFERENCE PLANE
.016 - .019** (0.406 - 0.483) DIA .050 (1.270) TYP .100 (2.540) TYP PIN 1 .050 (1.270) TYP
45 .036 - .046 (0.914 - 1.168) .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)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
Thermal Shield* for TO-46, H Package
.399 - .409 (10.135 - 10.389) DIA .244 - .234 (5.690 - 5.943) SEATING PLANE .400 (10.160) .016 - .019 (0.406 - 0.483) TYP DIA .100 (2.540) .050 (1.270) * THERMAL SHIELD MATERIAL IS VALOXTM. VALOX IS A TRADEMARK OF GENERAL ELECTRIC .025 (0.635) MAX
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LM199/LM399 LM199A/LM399A RELATED PARTS
PART NUMBER LT1021 LT1389 LT1634 LTZ1000 DESCRIPTION Precision References for Series or Shunt Operation 1.25V, 2.5V, 4V and 5V Nanopower Shunt Reference 1.25 and 2.5V Micropower Shunt Reference 7V Ultra Precision, Stable Shunt Reference COMMENTS Industry Standard Pinout, -40C to 125C 800nA, 0.05% Accuracy, 10ppm/C Drift 0.05%, 10ppm/C, 10A Current 0.05ppm/C, 1.2mVP-P Noise
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
LT 1005 REV B * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1987

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