Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

In a device with multiple channels, how should I handle the operational amplifiers not being used?

0
Posted

In a device with multiple channels, how should I handle the operational amplifiers not being used?

0

A1 The device will not be damaged if you leave the relevant input pins open, but the operation of the open channels will be unstable, which may destabilize the IC internallyNote. It is therefore recommended to make the input pins into voltage followers by connecting the + input to a potential within the common mode input voltage range (e.g. GND). Note, however, that in the case of the uPC4556, the amplifier must have a gain of at least 10 fold. Note [Example of instability] • When the input pin of an unused channel is left open, the channel becomes active due to noise application from an external source, causing the power supply current (of the unused channel) to fluctuate greatly. This fluctuation may affect the operation of the other channels in the same IC. The unused pin processing method does not depend on the power supply method. A concrete example is described below.

Related Questions

Thanksgiving questions

*Sadly, we had to bring back ads too. Hopefully more targeted.