LM199/LM399
LM199A/LM399A
Precision Reference
DESCRIPTIO
U
STABILIZED
(T
J
≈
90°C)
T
J
=
25°C
8
6
REVERSE CURRENT (mA)
4
10
LM199 TA01b
FEATURES
■
■
■
■
■
■
■
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
APPLICATIO S
■
■
■
■
■
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.
, 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
®
1001
4
2
LM199399fb
1
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, 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
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
V
Z
ΔV
Z
r
Z
ΔV
Z
ΔTemp
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 T
A
= 25°C. (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
Ω
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
µV
0.5mA ≤ I
R
≤ 10mA
0.5mA ≤ I
R
≤ 10mA
6.8
6.95
6
0.5
0.3
5
0.2
5
7.1
9
1
1
15
I
R
= 1mA (Note 6) (10Hz ≤ f ≤ 100Hz)
●
–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
Stabilized, 22°C ≤ T
A
≤ 28°C,
1000 Hours, I
R
= 1mA ±0.1%
●
0.3
0.5
10
0.3
7
8
8.5
22
●
2
LM199A/LM399A
1
50
e
n
ΔV
Z
ΔTime
I
H
V
H
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
LM199399fb
Temperature Stabilizer Supply Current T
A
= 25°C, Still Air, V
H
= 30V
T
A
= –55°C (Note 5)
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)
9
3
140
200
3
140
2
U
W
U
U
W W
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 –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 PERFOR A CE CHARACTERISTICS
Reverse Characteristics
100
100
10
DYNAMIC IMPEDANCE (Ω)
REVERSE CURRENT (mA)
OUTPUT (mV)
1
T
J
= 25°C
0.1
STABILIZED
(T
J
≈
90°C)
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)
V
H
= 40V
80
200
HEATER CURRENT (mA)
HEATER CURRENT (mA)
60
120
100
80
60
V
H
= 20V
40
20
0
85
105
0
V
H
= 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
U W
Dynamic Impedance
1
Stabilization Time
V
H
= 15V
T
A
= 25°C
T
A
= –55°C
–1
0
10
STABILIZED
(T
J
≈
90°C)
1
T
J
= 25°C
–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
T
A
= 25°C
V
H
= 10V
40
V
H
= 20V
20
V
H
= 40V
0
25 45 65
–55 –35 –15 5
TEMPERATURE (°C)
V
H
= 30V
V
H
= 10V
V
H
= 30V
LM199 G05
LM199399fb
3
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 (Ω)
100
STABILIZED
(T
J
≈
90°C)
T
J
= 25°C
Long-Term Reference
Performance, 44 Units Tested
12
10
NOISE(10µV/DIV)
8
3 SIGMA
6
4
2
0
2
4
6
8
MONTHS
10
12
LM199 G10
DRIFT (ppm)
4
U W
Response Time
OUTPUT
STABILIZED
(T
J
≈
90°C)
T
J
= 25°C
800
700
600
500
400
300
200
100
0
Limiting Surge Current
7.5k
INPUT
OUTPUT
25°C (46mA)
5°C (60mA)
–15°C (71mA)
–35°C (87mA)
–55°C (105mA)
INPUT
0
100
200
TIME (µs)
300
400
LM199 G08
0
20
10
30
MINIMUM SUPPLY VOLTAGE (V)
40
HEATER MUST BE BYPASSED WITH A 2µF 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
LM199399fb
LM199/LM399
LM199A/LM399A
FU CTIO AL BLOCK DIAGRA
W
3
1
TYPICAL APPLICATIO S
Single Supply Operation
9V TO 40V
R
S
+
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
1µF
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
1µF
22k
2
7
6
OUTPUT
+
3
1
LT1001AC
4
LM199399fb
5
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