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LM334SMX Datasheet(PDF) 9 Page - Texas Instruments

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Part No. LM334SMX
Description  LM134/LM234/LM334 3-Terminal Adjustable Current Sources
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM134, LM234, LM334
www.ti.com
SNVS746C – MAY 2004 – REVISED MARCH 2005
If the estimate for the tempco of the diode's forward voltage drop was off, the tempco cancellation is still
reasonably effective. Assume the tempco of the diode is 2.6mV/°C instead of 2.5mV/°C (an error of 4%). The
tempco of the circuit is now:
(11)
A 1mA LM134 current source with no temperature compensation would have a set resistor of 68
Ω and a
resulting tempco of
(12)
So even if the diode's tempco varies as much as ±4% from its estimated value, the circuit still eliminates 98% of
the LM134's inherent tempco.
Typical Applications
*Select R3 = VREF/583μA. VREF may be any stable positive voltage ≥ 2V
Trim R3 to calibrate
Figure 16. Ground Referred Fahrenheit Thermometer
Figure 17. Terminating Remote Sensor for Voltage Output
Copyright © 2004–2005, Texas Instruments Incorporated
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Product Folder Links: LM134 LM234 LM334




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