LM129/LM329
6.9V Precision
Voltage Reference
FEATURES
DESCRIPTION
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The LM129 temperature compensated 6.9V zener references 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 coefficient grades and two package styles. A 20mA positive current source application is
shown below.
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Guaranteed 10ppm/°C Temperature Coefficient
Guaranteed 1Ω Maximum Dynamic Impedance
Guaranteed 20μV Maximum Wideband Noise
Wide Operating Current Range 0.6mA to 15mA
APPLICATIONS
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Transducers
A/D and D/A Converters
Calibration Standards
Instrumentation Reference
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
20mA Positive Current Source
Reverse Voltage Change
20V
8
2
–
7
LT1001
3
20k
0.1%
4.3k
+
REVERSE VOLTAGE CHANGE (mV)
20k
0.1%
LM329
6.95V
TA = 25°C
174Ω
0.1%
6
4
10k
OUT
20mA
129329 TA01
7
6
5
4
3
2
1
0
0
2
4
8
6
REVERSE CURRENT (mA)
10
129329 TA01b
129329fb
1