Datasheet

LM129/LM329
1
129329fc
TYPICAL APPLICATION
DESCRIPTION
6.9V Precision
Voltage Reference
The LM129 temperature compensated 6.9V Zener refer-
ences provide excellent stability over time and temperature,
very low dynamic impedance and a wide operating current
range. The device achieves low dynamic impedance 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 eliminates surface
noise phenomenon associated with ordinary Zeners. To
serve a wide variety of applications, the LM129 is available
in several temperature coeffi cient grades and two pack-
age styles. A 20mA positive current source application is
shown below.
20mA Positive Current Source
FEATURES
APPLICATIONS
n
Guaranteed 10ppm/°C Temperature Coeffi cient
n
Guaranteed 1Ω Maximum Dynamic Impedance
n
Guaranteed 20μV Maximum Wideband Noise
n
Wide Operating Current Range: 0.6mA to 15mA
n
Transducers
n
A/D and D/A Converters
n
Calibration Standards
n
Instrumentation Reference
Reverse Voltage Change
–
+
20V
LM329
6.95V
20k
0.1%
174Ω
0.1%
4.3k
20k
0.1%
LT1001
10k
OUT
20mA
129329 TA01
2
3
7
6
4
REVERSE CURRENT (mA)
0
REVERSE VOLTAGE CHANGE (mV)
6
10
129329 TA01b
24 8
8
7
6
5
4
3
2
1
0
T
A
= 25°C
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