Abstract
This chapter focuses on how to build current sources using different kinds of discrete—monolithic integrated circuit (IC) current source circuits. These devices can be used in many diverse applications requiring microamps to several milliamps and are readily available in either through hole or surface-mount packages. There are two dedicated monolithic current source ICs that exist in the U.S. analog marketplace. One of them is National Semiconductor's LM134 series, and the other is TI/Burr-Brown's newer REF-200. The chapter presents several diverse current source applications for the LM134. The LM134/334 is used to set the bias current for a micropower, programmable op amp, such as National's LM4250. Programmable op amps such as LM4250 are useful in many low-power applications. Additionally, being a current source, the LM134 also doubles as an accurate, remote temperature sensor. Because of its current-mode operation, it does not lose accuracy as a result of long cable runs. The LM134 family, because of this predictable temperature dependence, is particularly useful in applications where remote temperature sensing or long cable runs are necessary.
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