Datasheet

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LM199/LM399

LM199A/LM399A

LM199399fb

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.

■

Precision Voltage Reference for Multimeters

■

Calibration Equipment Voltage Standards

■

Laboratory Measurement Equipment

■

Industrial Monitor/Control Instruments

■

High Accuracy Data Converters

■

6.95V Shunt Reference

■

Guaranteed 0.5ppm/°C Temperature Coefﬁ cient

■

Guaranteed 1Ω Maximum Dynamic Impedance

■

Guaranteed 20µV

RMS

Maximum Noise

■

Guaranteed Initial Tolerance of 2%

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Wide Operating Current Range

■

Available in 4-Lead TO-46 Metal Can

10V Buffered Reference

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

0.1%

7.5k

–

6.95V

15V

LM399H

20k

0.1%

10V

LM199 TA01a

–

1001

REVERSE CURRENT (mA)

REVERSE VOLTAGE CHANGE (mV)

LM199 TA01b

24 8

STABILIZED

≈ 90°C)

= 25°C

Reverse Voltage Change

Summary of content (8 pages)

PAGE 1
LM199/LM399 LM199A/LM399A Precision Reference U FEATURES DESCRIPTIO ■ The LM199/LM399 precision shunt reference features excellent temperature stability over a wide range of voltage, 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.
PAGE 2
LM199/LM399 LM199A/LM399A U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Note 1) 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 .......................................
PAGE 3
LM199/LM399 LM199A/LM399A 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.
PAGE 4
LM199/LM399 LM199A/LM399A U W TYPICAL PERFOR A CE CHARACTERISTICS Response Time 8 OUTPUT 7 150 STABILIZED (TJ ≈ 90°C) 100 5 VOLTAGE SWING (V) NOISE (nV/√Hz) 6 4 Limiting Surge Current STABILIZED (TJ ≈ 90°C) MAXIMUM SURGE LIMITING RESISTOR (Ω) Zener Noise Voltage 200 TJ = 25°C 3 7.
PAGE 5
LM199/LM399 LM199A/LM399A W U U FU CTIO AL BLOCK DIAGRA 3 1 + + H – – 4 2 LT199 FD U TYPICAL APPLICATIO S Single Supply Operation Split Supply Operation 9V TO 40V Negative Heater Supply with Positive Reference 15V 15V RS 7.5k + 7.5k + + LM399 LM399 LM399 6.95V 6.95V 6.95V – – – LM199 TA02 –9V TO –33V –15V LM199 TA04 LM199 TA03 Standard Cell Replacement 15V TO 20V 1% REGULATED 1µF 7.5k + – 1 3 4 OUTPUT ADJUST LM199A 12k 0.1% 6.
PAGE 6
LM199/LM399 LM199A/LM399A U TYPICAL APPLICATIO S Portable Calibrator 8.8k 1% 2 200k + 12V TO 18V – 7 LT1001AC 3 + 6 OUTPUT 10V 4 5k + 19k 1% LM399 6.95V 3k TRIM – LM199 TA06 W W SCHE ATIC DIAGRA S Temperature Stabilizer Reference 3 1 Q9 Q5 Q2 + 1k Q3 6.3V 50Ω Q10 + Q15 Q8 Q6 Q1 Q14 2k Q12 15pF Q7 10pF 30pF 2k Q16 Q13 10k 11.2k 2k D1 6.3V Q3 Q4 4.2Ω D2 6.3V 2k Q11 2.
PAGE 7
LM199/LM399 LM199A/LM399A U PACKAGE DESCRIPTIO H Package 4-Lead TO-46 Metal Can Thermal Shield* for TO-46, H Package (Reference LTC DWG # 05-08-1341) .209 – .219 (5.309 – 5.563) .178 – .195 (4.521 – 4.953) REFERENCE PLANE .085 – .105 (2.159 – 2.667) .500 (12.700) MIN .025 (0.635) MAX SEATING* PLANE .016 – .019** (0.406 – 0.483) DIA .050 (1.270) TYP .100 (2.540) TYP .399 – .409 (10.135 – 10.389) DIA .244 – .234 (5.690 – 5.943) SEATING PLANE .400 (10.160) .016 – .019 (0.406 – 0.483) TYP DIA .
PAGE 8
LM199/LM399 LM199A/LM399A RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1021 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.