LM399AH - ANALOG DEVICES

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

Typical applicaTion

FeaTures DescripTion

Precision Reference

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.

10V Buffered Reference Reverse Voltage Change

applicaTions

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

n Precision Voltage Reference for Multimeters

n Calibration Equipment Voltage Standards

n Laboratory Measurement Equipment

n Industrial Monitor/Control Instruments

n High Accuracy Data Converters

n 6.95V Shunt Reference

n Guaranteed 0.5ppm/°C Temperature Coefﬁcient

n Guaranteed 1Ω Maximum Dynamic Impedance

n Guaranteed 20µVRMS Maximum Noise

n Guaranteed Initial Tolerance of 2%

n Wide Operating Current Range

n Available in 4-Lead TO-46 Metal Can

0.1%

7.5k

–

4 2

6.95V

15V

LM399H

20k

0.1%

610V

LM199 TA01a

–

LT®1001

REVERSE CURRENT (mA)

REVERSE VOLTAGE CHANGE (mV)

610

LM199 TA01b

02 4 8

STABILIZED

(TJ ≈ 90°C)

TJ = 25°C

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

pin conFiguraTionabsoluTe MaxiMuM raTings

TOP VIEW

H PACKAGE

4-LEAD TO-46 METAL CAN

INSIDE THERMAL SHIELD

–

–3+

orDer inForMaTion

LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE

LM399H LM399H#TRPBF LM399H 4-Lead TO-46 Metal Can 0°C to 70°C

LM399AH LM399AH#TRPBF LM399AH 4-Lead TO-46 Metal Can 0°C to 70°C

OBSOLETE PACKAGE

LM199H LM199H#TRPBF 4-Lead TO-46 Metal Can –55°C to 125°C

LM199AH LM199AH#TRPBF 4-Lead TO-46 Metal Can –55°C to 125°C

LM199AH-20 LM199AH-20#TRPBF 4-Lead TO-46 Metal Can –55°C to 125°C

LM399AH-20 LM399AH-20#TRPBF 4-Lead TO-46 Metal Can 0°C to 70°C

LM399AH-50 LM399AH-50#TRPBF 4-Lead TO-46 Metal Can 0°C to 70°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on nonstandard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

LM199/LM199A LM399/LM399A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

VZReverse Breakdown Voltage 0.5mA ≤ IR ≤ 10mA l6.8 6.95 7.1 6.75 6.95 7.3 V

ΔVZReverse Breakdown Voltage Change

with Current

0.5mA ≤ IR ≤ 10mA l6 9 6 12 mV

rZReverse Dynamic Impedance IR = 1mA (Note 6) (10Hz ≤ f ≤ 100Hz) l0.5 1 0.5 1.5 Ω

ΔVZ

ΔTemp

Temperature Coefficient

LM199/LM399

–55°C ≤ TA ≤ 85°C

85°C ≤ TA ≤ 125°C

0°C ≤ TA ≤ 70°C

0.3

ppm/°C

LM199A/LM399A –55°C ≤ TA ≤ 85°C

85°C ≤ TA ≤ 125°C

0°C ≤ TA ≤ 70°C

0.2

0.5

0.3

ppm/°C

enRMS Noise 10Hz ≤ f ≤ 10kHz l7 20 7 50 µV

elecTrical characTerisTics

Temperature Stabilizer ..............................................40V

Reverse Breakdown Current ...................................20mA

Forward Current ....................................................... 1mA

Reference to Substrate Voltage, VRS (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

(Note 1)

The l denotes the specifications which apply over the full operating

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

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%

8 (Note 4) 8 (Note 4) ppm/√kH

IHTemperature Stabilizer Supply

Current

TA = 25°C, Still Air, VH = 30V

TA = –55°C (Note 5)

8.5

8.5 15 mA

VH Temperature Stabilizer Supply

Voltage

l9 40 9 40 V

Warm-Up Time to ±0.05% VZVH = 30V 3 3 Seconds

Initial Turn-On Current 9V ≤ VH ≤ 40V (Note 5) 140 200 140 200 mA

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

REVERSE CURRENT (mA)

0.1

100

6.45 6.65

LM199 G01

6.85 7.05

TJ = 25°C

STABILIZED

(TJ ≈ 90°C)

FREQUENCY (Hz)

0.1

DYNAMIC IMPEDANCE (Ω)

100

100 1k 10k 100k

LM199 G02

1TJ = 25°C

STABILIZED

(TJ ≈ 90°C)

HEATER ON TIME (SECONDS)

OUTPUT (mV)

–1

LM199 G03

–2

–3

–4 4812 20

TA = 25°C

VH = 15V

TA = –55°C

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

Typical perForMance characTerisTics

Zener Noise Voltage Response Time Limiting Surge Current

FREQUENCY (Hz)

100

150

200

100 1k 10k 100k

LM199 G07

NOISE (nV/√Hz)

TJ = 25°C

STABILIZED

(TJ ≈ 90°C)

TIME (µs)

VOLTAGE SWING (V)

400

LM199 G08

100 200 300

TJ = 25°C

OUTPUT

INPUT

STABILIZED

(TJ ≈ 90°C)

INPUT

OUTPUT

7.5k

MINIMUM SUPPLY VOLTAGE (V)

MAXIMUM SURGE LIMITING RESISTOR (Ω)

400

600

LM199 G09

200

010 20 30

800

25°C (46mA)

5°C (60mA)

–15°C (71mA)

–35°C (87mA)

–55°C (105mA)

300

500

100

700

HEATER MUST BE BYPASSED WITH A 2µF OR LARGER

TANTALUM CAPACITOR IF RESISTORS ARE USED

Long-Term Reference

Performance, 44 Units Tested Low Frequency Noise Voltage

MONTHS

DRIFT (ppm)

4 6 8 10

LM199 G10

3 SIGMA

MEAN

TIME (SECONDS)

NOISE(10µV/DIV)

200

LM199 G11

50 100 150 250

Initial Heater Current Heater Current Heater Current

TURN ON TEMPERATURE (°C)

–55

INITIAL HEATER CURRENT (mA)

150

200

250

–15 25 45 125

LM199 G04

100

–35 5 65 85 105

VH = 40V

TEMPERATURE (°C)

–55

HEATER CURRENT (mA)

105

LM199 G05

0–15 25 65

–35 545 85

VH = 10V

VH = 20V

VH = 40V

VH = 30V

TIME (SECONDS)

HEATER CURRENT (mA)

160

140

120

100

016

LM199 G06

4 8 12 142 6 10 18

VH = 10V

VH = 20V

TA = 25°C

VH = 30V

VH = 40V

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

FuncTional block DiagraM

Typical applicaTions

–

LT199 FD

Single Supply Operation

–

6.95V

LM199 TA02

9V TO 40V

LM399

Split Supply Operation

7.5k

–

6.95V

LM199 TA03

15V

–15V

LM399

Negative Heater Supply with

Positive Reference

7.5k

–

6.95V

LM199 TA04

15V

–9V TO –33V

LM399

Standard Cell Replacement

7.5k

2M OUTPUT

1µF

20k

22k

12k

0.1%

OUTPUT

ADJUST

0.1%

–

4 2

6.95V

15V TO 20V

1% REGULATED

LM199A

LM199 TA05

–

LT1001AC

100k

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

Typical applicaTions

scheMaTic DiagraMs

Portable Calibrator

200k

OUTPUT

10V

8.8k

TRIM

19k

–

6.95V

12V TO

18V

LM199 TA06

LM399

+–

LT1001AC

Temperature Stabilizer

11.2k

6.3V

1k4.2Ω

–

LM199 SD01

10pF

Reference

6.3V

50Ω

30k

2k 2.6k

Q10

Q11

Q13

Q14

Q15

15pF 2k

10k

Q12

Q16

–

LM199 SD02

30pF

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

revision hisTory

REV DATE DESCRIPTION PAGE NUMBER

C 12/14 Package/Order Information updated

Thermal shield dimensions corrected

(Revision history begins at Rev C)

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

.400 – .420

(10.160 – 10.668)

DIA

.016 – .019

(0.406 – 0.483)

TYP DIA

.100

(2.540)

.225 – .240

(5.715 – 6.096)

.450

(11.430)

.050

(1.270)

SEATING

PLANE

REF

.016 – .019**

(0.406 – 0.483)

DIA

.025

(0.635)

MAX

REFERENCE

PLANE

.085 – .105

(2.159 – 2.667)

.500

(12.700)

MIN

.178 – .195

(4.521 – 4.953)

.209 – .219

(5.309 – 5.563)

.100

(2.540)

TYP

H4(TO-46) 0801

.050

(1.270)

TYP

.050

(1.270)

TYP

.028 – .048

(0.711 – 1.219)

.036 – .046

(0.914 – 1.168)

SEATING*

PLANE

LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE

AND .050" BELOW THE REFERENCE PLANE

FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS .016 – .024

(0.406 – 0.610)

PIN 1

H Package

4-Lead TO-46 Metal Can

(Reference LTC DWG # 05-08-1341) Thermal Shield* for TO-46, H Package

*THERMAL SHIELD MATERIAL IS VALOX

LM199/LM399

LM199A/LM399A

199399fc

For more information www.linear.com/LM399

 LINEAR TECHNOLOGY CORPORATION 1987

LT 1214 REV C • PRINTED IN USA

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LM399

relaTeD parTs

PART NUMBER DESCRIPTION COMMENTS

1021 Precision References for Series or Shunt Operation Industry Standard Pinout, –40°C to 125°C

LT1389 1.25V, 2.5V, 4V and 5V Nanopower Shunt Reference 800nA, 0.05% Accuracy, 10ppm/°C Drift

LT1634 1.25 and 2.5V Micropower Shunt Reference 0.05%, 10ppm/°C, 10µA Current

LTZ1000 7V Ultra Precision, Stable Shunt Reference 0.05ppm/°C, 1.2mVP-P Noise