LM199/LM399

LM199A/LM399A

3

LM199399fb

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

the LM399.

Reverse Characteristics

Dynamic Impedance

Stabilization Time

ELECTRICAL CHARACTERISTICS

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

HEATER ON TIME (SECONDS)

0

–1

0

1

16

LM199 G03

–2

–3

–4

4

8

12

20

Initial Heater Current

Heater Current

Heater Current

TURN ON TEMPERATURE (

°C)

–55

0

50

150

200

250

–15

25

45

125

LM199 G04

100

–35

5

65

85 105

TEMPERATURE (

°C)

–55

40

60

105

LM199 G05

20

0

–15

25

65

–35

5

45

85

80

TIME (SECONDS)

0

160

140

120

100

80

60

40

20

0

16

LM199 G06

4

8

12 14

2

6

10

18

REVERSE VOLTAGE (V)

6.25

0.01

0.1

1

10

100

6.45

6.65

LM199 G01

6.85

7.05

STABILIZED

FREQUENCY (Hz)

10

0.1

10

100

100

1k

10k

100k

LM199 G02

1

STABILIZED