LM134 Series
1
APPLICATIO S
DESCRIPTIO
FEATURES
TYPICAL APPLICATIO
s
Current Mode Temperature Sensing
s
Constant Current Source for Shunt References
s
Cold Junction Compensation
s
Constant-Gain Bias for Bipolar Differential Stage
s
Micropower Bias Networks
s
Buffer for Photoconductive Cell
s
Current Limiter
s
1礎 to 10mA Operation
s
0.02%/V Regulation
s
0.8V to 40V Operating Voltage
s
Can be Used as Linear Temperature Sensor
s
Draws No Reverse Current
s
Supplied in Standard Transistor Packages
Constant Current Source
and Temperature Sensor
The LM134 is a three-terminal current source designed to
operate at current levels from 1礎 to 10mA, as set by an
external resistor. The device operates as a true two-
terminal current source, requiring no extra power connec-
tions or input signals. Regulation is typically 0.02%/V and
terminal-to-terminal voltage can range from 800mV to
40V.
Because the operating current is directly proportional to
absolute temperature in degrees Kelvin, the device will
also find wide applications as a temperature sensor. The
temperature dependence of the operating current is
0.336%/癈 at room temperature. For example, a device
operating at 298礎 will have a temperature coefficient of
1礎/癈. The temperature dependence is extremely accu-
rate and repeatable. Devices specified as temperature
sensors in the 100礎 to 1mA range are the LM134-3,
LM234-3 and the LM134-6, LM234-6, with the dash
numbers indicating ?癈 and ?癈 accuracies, respec-
tively.
If a zero temperature coefficient current source is re-
quired, this is easily achieved by adding a diode and a
resistor.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Remote Temperature Sensor with Voltage Output
Operating Current vs Temperature
V
+
V
R
R
SET
226&
V
IN
e 5V
R1
10k
10mV/癒
LM234-3
TA01a
OPERATING CURRENT (礎)
0
500
400
300
200
100
0
400
TA01b
100
200
300
500
225
125
25
75
175
275
R
SET
= 226&
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