LM334H Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LM334H Datasheet PDF : 12 Pages
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FEATURES
s 1µA 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
U
APPLICATIO S
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
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Remote Temperature Sensor with Voltage Output
V+
R
RSET
226Ω LM234-3 V–
VIN ≥ 5V
10mV/°K
R1
10k
TA01a
LM134 Series
Constant Current Source
and Temperature Sensor
DESCRIPTIO
The LM134 is a three-terminal current source designed to
operate at current levels from 1µA 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%/°C at room temperature. For example, a device
operating at 298µA will have a temperature coefficient of
1µA/°C. The temperature dependence is extremely accu-
rate and repeatable. Devices specified as temperature
sensors in the 100µA to 1mA range are the LM134-3,
LM234-3 and the LM134-6, LM234-6, with the dash
numbers indicating ±3°C and ±6°C accuracies, respec-
tively.
If a zero temperature coefficient current source is re-
quired, this is easily achieved by adding a diode and a
resistor.
Operating Current vs Temperature
500
225
400
125
RSET = 226Ω
300
25
200
–75
100
–175
0
–275
0
100 200 300 400 500
OPERATING CURRENT (µA)
TA01b
1
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