Voltage references are highly precise components that must be treated well in order to extract their maximum accuracy and performance. In this article, learn about three common issues to avoid when designing an IC with a voltage reference.
Output Voltage Precision Degradation
Most voltage references have input, output, and ground terminals. If the difference between the input and output voltage is too small, the output voltage precision is degraded. Therefore, it is essential to work in the full precision region to obtain the specified accuracy.
Exceeding Maximum Load Current
Most voltage references have current-limited outputs so that they will not be damaged by short circuits. Be sure to follow data sheet specifications to avoid exceeding (or even getting very near to) these limits, as that could cause a drop in current output with an associated drop in accuracy.
Incorrect Capacitative Loading
Most voltage references are stable with any capacitive load. Some, however, especially low dropout (LDO1) types, may oscillate with too much or too little load capacitance. If this happens, the output voltage can cease to be regulated correctly, leading to inaccurate readings.
The above three problems are ones that almost all electrical engineers will experience at some point in their careers. However, by being able to recognize these issues early in the process, it becomes much easier to solve for them and to complete your design.
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