LM129/LM329

1

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

s

Transducers

s

A/D and D/A Converters

s

Calibration Standards

s

Instrumentation Reference

s

Guaranteed 10ppm/

°C Temperature Coefficient

s

Guaranteed 1

Ω Maximum Dynamic Impedance

s

Guaranteed 20

µV Maximum Wideband Noise

s

Wide Operating Current Range 0.6mA to 15mA

6.9V Precision

Voltage Reference

The LM129 temperature compensated 6.9V zener refer-

ences provide excellent stability over time and tempera-

ture, very low dynamic impedance and a wide operating

current range. The device achieves low dynamic imped-

ance by incorporating a high gain shunt regulator around

the zener. The excellent noise performance of the device is

achieved by using a “buried zener” design which elimi-

nates surface noise phenomenon associated with ordi-

nary zeners. To serve a wide variety of applications, the

LM129 is available in several temperature coefficient

grades and two package styles. A 20mA positive current

source application is shown below.

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

REVERSE CURRENT (mA)

0

6

10

129/329 TA01b

24

8

8

7

6

5

4

3

2

1

0

–

+

20V

LM329

6.95V

20k

0.1%

174

Ω

0.1%

4.3k

20k

0.1%

LT1001

10k

OUT

20mA

129/329 TA01

2

3

7

6

4

20mA Positive Current Source

Reverse Voltage Change