LM399_15 Datasheet, PDF (3/8 Pages) Linear Technology – Precision Reference

LM199/LM399
LM199A/LM399A
ELECTRICAL Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. (Note 3)
LM199/LM199A
LM399/LM399A
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX UNITS
ΔVZ Long-Term Stability
ΔTime
Stabilized, 22°C ≤ T_A ≤ 28°C,
1000 Hours, I_R = 1mA ±0.1%
8 (Note 4)
8 (Note 4) ppm/√kH
I_H
Temperature Stabilizer Supply
T_A = 25°C, Still Air, V_H = 30V
Current
T_A = –55°C (Note 5)
8.5 14
22 28
8.5 15
mA
V_H
Temperature Stabilizer Supply
Voltage
l9
40
9
40
V
Warm-Up Time to ±0.05% V_Z
Initial Turn-On Current
V_H = 30V
9V ≤ V_H ≤ 40V (Note 5)
3
140 200
3
Seconds
140 200
mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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 Performance Characteristics
Reverse Characteristics
100
Dynamic Impedance
100
10
1
0.1
0.01
6.25
T_J = 25°C
STABILIZED
(T_J ≈ 90°C)
6.45
6.65
6.85
7.05
REVERSE VOLTAGE (V)
LM199 G01
10
STABILIZED
(T_J ≈ 90°C)
1
T_J = 25°C
0.1
10
100
1k
10k
100k
FREQUENCY (Hz)
LM199 G02
Stabilization Time
1
V_H = 15V
T_A = 25°C
0
T_A = –55°C
–1
–2
–3
–4
0
4
8
12
16
20
HEATER ON TIME (SECONDS)
LM199 G03
For more information www.linear.com/LM399
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