LM129/LM329
6.9V Precision
Voltage Reference
FEATURES
s
s
s
s
DESCRIPTIO
Guaranteed
10ppm/°C Temperature Coefficient
Guaranteed
1Ω Maximum Dynamic Impedance
Guaranteed
20µV Maximum Wideband Noise
Wide Operating Current Range 0.6mA to 15mA
APPLICATIO S
s
s
s
s
Transducers
A/D and D/A Converters
Calibration Standards
Instrumentation 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.
TYPICAL APPLICATIO
20mA Positive Current Source
20V
REVERSE VOLTAGE CHANGE (mV)
20k
0.1%
174Ω
0.1%
8
Reverse Voltage Change
T
A
= 25°C
7
6
5
4
3
2
1
0
0
2
4
8
6
REVERSE CURRENT (mA)
10
LM329
6.95V
2
–
+
7
LT1001
6
3
20k
0.1%
4
10k
OUT
20mA
129/329 TA01
4.3k
U
129/329 TA01b
U
U
1
LINER [ LINEAR TECHNOLOGY ]
