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
LINER [ LINEAR TECHNOLOGY ]
