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FEATURES
LM199/LM399
LM199A/LM399A
Precision Reference
U
DESCRIPTIO
■
6.95V Shunt Reference
■
Guaranteed 0.5ppm/°C Temperature Coeffi cient
■
Guaranteed 1Ω Maximum Dynamic Impedance
■
Guaranteed 20µV
■
Guaranteed Initial Tolerance of 2%
■
Wide Operating Current Range
■
Available in 4-Lead TO-46 Metal Can
Maximum Noise
RMS
U
APPLICATIO S
■
Precision Voltage Reference for Multimeters
■
Calibration Equipment Voltage Standards
■
Laboratory Measurement Equipment
■
Industrial Monitor/Control Instruments
■
High Accuracy Data Converters
U
TYPICAL APPLICATIO
10V Buffered Reference
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.
Reverse Voltage Change
15V
+
3
LM399H
6.95V
–
42
1
7.5k
5%
20k
0.1%
9k
0.1%
2
3
–
LT®1001
+
7
4
LM199 TA01a
8
7
6
6
10V
5
4
3
2
REVERSE VOLTAGE CHANGE (mV)
1
0
0
STABILIZED
≈ 90°C)
(T
J
TJ = 25°C
24 8
REVERSE CURRENT (mA)
6
LM199 TA01b
10
LM199399fb
1
LM199/LM399
LM199A/LM399A
WW
W
U
ABSOLUTE AXI U RATI GS
(Note 1)
Temperature Stabilizer ..............................................40V
Reverse Breakdown Current ...................................20mA
Forward Current .......................................................1mA
Reference to Substrate Voltage, V
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 2) ........–0.1V
RS
UUW
PACKAGE/ORDER I FOR ATIO
TOP VIEW
+
1
2
–
H PACKAGE
4-LEAD TO-46 METAL CAN
INSIDE THERMAL SHIELD
ORDER PART NUMBER
LM399H
LM399AH
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.
–
4
H
3
+
LM199H
LM199AH
LM199AH-20
LM399AH-20
LM399AH-50
OBSOLETE
●
The
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
V
Z
ΔV
r
Z
ΔV
ΔTem p
e
n
ΔV
ΔTime
I
H
V
H
Reverse Breakdown Voltage 0.5mA ≤ IR ≤ 10mA
Reverse Breakdown Voltage Change
Z
with Current
Reverse Dynamic Impedance IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz)
Temperature Coeffi cient
Z
LM199/LM399 –55°C ≤ T
LM199A/LM399A –55°C ≤ T
RMS Noise 10Hz ≤ f ≤ 10kHz
Long-Term Stability Stabilized, 22°C ≤ T
Z
Temperature Stabilizer Supply Current TA = 25°C, Still Air, VH = 30V
Temperature Stabilizer Supply Voltage
Warm-Up Time to ±0.05% V
Initial Turn-On Current 9V ≤ V
Z
0.5mA ≤ IR ≤ 10mA
85°C ≤ T
0°C ≤ T
85°C ≤ T
0°C ≤ T
1000 Hours, I
T
A
VH = 30V 3 3 Seconds
= 25°C. (Note 3)
A
≤ 85°C
A
≤ 125°C
A
≤ 70°C
A
≤ 85°C
A
≤ 125°C
A
≤ 70°C
A
= 1mA ±0.1%
R
= –55°C (Note 5)
≤ 40V (Note 5) 140 200 140 200 mA
H
denotes the specifi cations which apply over the full operating
LM199/LM199A LM399/LM399A
●
6.8 6.95 7.1 6.75 6.95 7.3 V
≤ 28°C,
A
●
●
●
●
69 612 mV
0.5 1 0.5 1.5
0.3
0.250.5
8.52214
9 40 9 40 V
1
5
15
10
7 20 7 50 µV
8 (Note 4) 8 (Note 4) ppm/√kH
28
0.3 2
0.3 1
8.5 15 mA
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
LM199399fb
Ω
2
ELECTRICAL CHARACTERISTICS
LM199/LM399
LM199A/LM399A
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 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.”
Note 3: These specifi cations apply for 30V applied to the temperature
stabilizer and –55°C ≤ T
≤ 125°C for the LM199; and 0°C ≤ TA ≤ 70°C for
A
the LM399.
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Reverse Characteristics Dynamic Impedance Stabilization Time
100
10
1
TJ = 25°C
0.1
REVERSE CURRENT (mA)
0.01
6.25
6.45 6.65
REVERSE VOLTAGE (V)
STABILIZED
≈ 90°C)
(T
J
6.85 7.05
LM199 G01
100
10
STABILIZED
≈ 90°C)
(T
J
1
DYNAMIC IMPEDANCE (Ω)
0.1
10
100 1k 10k 100k
FREQUENCY (Hz)
TJ = 25°C
LM199 G02
1
VH = 15V
0
–1
–2
OUTPUT (mV)
–3
–4
0
TA = 25°C
TA = –55°C
4
HEATER ON TIME (SECONDS)
12
8
16
20
LM199 G03
Initial Heater Current Heater Current Heater Current
250
VH = 40V
200
150
100
50
INITIAL HEATER CURRENT (mA)
0
–35 5
–15
–55
TURN ON TEMPERATURE (°C)
25
85
45 125
105
65
LM199 G04
80
60
40
VH = 20V
HEATER CURRENT (mA)
20
VH = 40V
0
–35
–55
–15
TEMPERATURE (°C)
VH = 10V
25
5
VH = 30V
45
85
LM199 G05
105
65
160
TA = 25°C
140
120
100
80
60
HEATER CURRENT (mA)
40
20
0
0
VH = 10V
VH = 20V
VH = 40V
4 8 12 142 6 10 18
TIME (SECONDS)
VH = 30V
16
LM199 G06
LM199399fb
3
LM199/LM399
LM199A/LM399A
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Zener Noise Voltage Response Time Limiting Surge Current
NOISE (nV/√Hz)
200
150
100
STABILIZED
≈ 90°C)
(T
J
TJ = 25°C
50
10
100 1k 10k 100k
FREQUENCY (Hz)
LM199 G07
8
7
6
STABILIZED
5
≈ 90°C)
(T
J
4
3
2
1
0
VOLTAGE SWING (V)
20
10
0
0
TJ = 25°C
INPUT
INPUT
100
TIME (µs)
OUTPUT
7.5k
OUTPUT
200
300
LM199 G08
400
800
700
600
500
400
300
200
100
MAXIMUM SURGE LIMITING RESISTOR (Ω)
HEATER MUST BE BYPASSED WITH A 2µF OR LARGER
TANTALUM CAPACITOR IF RESISTORS ARE USED
25°C (46mA)
5°C (60mA)
–15°C (71mA)
–35°C (87mA)
–55°C (105mA)
0
0
10
MINIMUM SUPPLY VOLTAGE (V)
20
30
40
LM199 G09
Long-Term Reference
Performance, 44 Units Tested
12
10
8
6
DRIFT (ppm)
4
2
0
2
3 SIGMA
46810
MONTHS
MEAN
LM199 G10
Low Frequency Noise Voltage
NOISE(10µV/DIV)
12
50
0
TIME (SECONDS)
100
150
200
250
LM199 G11
4
LM199399fb
FU CTIO AL BLOCK DIAGRA
LM199/LM399
LM199A/LM399A
WUU
TYPICAL APPLICATIO S
Single Supply Operation Split Supply Operation Negative Heater Supply with
9V TO 40V
R
S
+
LM399
6.95V
–
LM199 TA02
U
15V
–15V
+
H
–
13
+
–
24
LT199 FD
Positive Reference
15V
7.5k
+
LM399
6.95V
+
LM399
6.95V
7.5k
–
–
LM199 TA03
–9V TO –33V
LM199 TA04
15V TO 20V
1% REGULATED
Standard Cell Replacement
7.5k
+
3
LM199A
–
42
1
6.95V
OUTPUT
ADJUST
12k
0.1%
20k
2k
0.1%
100k
2M
1µF
1µF
22k
–
2
2k
3
LT1001AC
+
LM199 TA05
7
6
OUTPUT
4
LM199399fb
5
LM199/LM399
–
LM199A/LM399A
TYPICAL APPLICATIO S
U
Portable Calibrator
8.8k
1%
+
SCHE ATIC DIAGRA S
Temperature Stabilizer Reference
Q2
Q1
2k
10pF
2k
Q3
Q5
Q6
Q7
11.2k
Q4
1k4.2Ω
Q8
D1
6.3VD26.3V
12V TO
18V
200k
2
3
–
LT1001AC
+
7
6
OUTPUT
10V
4
5k
+
TRIM
19k
1%
3k
LM399
6.95V
–
LM199 TA06
WW
+
3
Q9
–
4
LM199 SD01
Q11
50Ω
15pF
Q10
Q12
2k
Q13
30k
Q3
6.3V
30pF
10k
1k
Q15
Q14
2k 2.6k
LM199 SD02
Q16
+
1
2
6
LM199399fb
PACKAGE DESCRIPTIO
H Package
4-Lead TO-46 Metal Can
(Reference LTC DWG # 05-08-1341)
LM199/LM399
LM199A/LM399A
U
Thermal Shield* for TO-46, H Package
.209 – .219
(5.309 – 5.563)
.178 – .195
(4.521 – 4.953)
.500
(12.700)
REFERENCE
PLANE
.036 – .046
(0.914 – 1.168)
*
LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND .050" BELOW THE REFERENCE PLANE
**
FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
MIN
.016 – .019**
(0.406 – 0.483)
DIA
.050
(1.270)
TYP
.100
(2.540)
TYP
PIN 1
45°
.085 – .105
(2.159 – 2.667)
.025
(0.635)
MAX
.050
(1.270)
TYP
.028 – .048
(0.711 – 1.219)
H4(TO-46) 0801
.016 – .024
(0.406 – 0.610)
SEATING*
PLANE
(10.135 – 10.389)
.244 – .234
(5.690 – 5.943)
SEATING
PLANE
.400
(10.160)
* THERMAL SHIELD MATERIAL IS VALOXTM.
VALOX IS A TRADEMARK OF GENERAL ELECTRIC
.399 – .409
DIA
.016 – .019
(0.406 – 0.483)
TYP DIA
.100
(2.540)
.050
(1.270)
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.
LM199399fb
7
LM199/LM399
LM199A/LM399A
RELATED PARTS
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, 1.2mV
P-P
Noise
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
LM199399fb
LT 1005 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 1987
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