I have a PIC16f627a uController and I want to use the comparator module. One input to this comparator will be a signal from a sensor and the other input will be from the Vref pin on the uController itself.
The datasheet mentions that when using the Vref pin I should use a buffer (like a 741 set up for unity gain) since the Vref pin has limited drive capabilities. But since the comparator itself is an op amp do I still need the buffer, is the input impedance of the comparator high enough that I don't need it? Should I add it anyways so if something blows it's the buffer and not something internal to my chip?
Thanks in advance!
The datasheet mentions that when using the Vref pin I should use a buffer (like a 741 set up for unity gain) since the Vref pin has limited drive capabilities. But since the comparator itself is an op amp do I still need the buffer, is the input impedance of the comparator high enough that I don't need it? Should I add it anyways so if something blows it's the buffer and not something internal to my chip?
Thanks in advance!