LM399 datasheet(3/8 Pages) LINER

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LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

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 ≤ TA ≤ 125°C for the LM199; and 0°C ≤ TA ≤ 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.”

elecTrical characTerisTics

Typical perForMance characTerisTics

LM199/LM199A

LM399/LM399A

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

ΔVZ

ΔTime

Long-Term Stability

Stabilized, 22°C ≤ TA ≤ 28°C,

1000 Hours, IR = 1mA ±0.1%

(Note 4)

(Note 4) ppm/√kH

Temperature Stabilizer Supply

Current

TA = 25°C, Still Air, VH = 30V

TA = –55°C (Note 5)

8.5

Temperature Stabilizer Supply

Voltage

Warm-Up Time to ±0.05% VZ

VH = 30V

Seconds

Initial Turn-On Current

9V ≤ VH ≤ 40V (Note 5)

140

200

140

200

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. (Note 3)

Reverse Characteristics

Dynamic Impedance

Stabilization Time

REVERSE VOLTAGE (V)

6.25

0.01

0.1

100

6.45

6.65

LM199 G01

6.85

7.05

TJ = 25°C

STABILIZED

(TJ ≈ 90°C)

FREQUENCY (Hz)

0.1

100

10k

100k

LM199 G02

TJ = 25°C

STABILIZED

(TJ ≈ 90°C)

HEATER ON TIME (SECONDS)

–1

LM199 G03

–2

–3

–4

TA = 25°C

VH = 15V

TA = –55°C

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