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Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. Per AN’d datasheet.

(PDF) AN6884 Datasheet download

You might want to edit to explain your answer a bit more. Fadecomic 2 6. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy aj6884 and cookie policyand that your continued use of the website is subject to these policies. There is also no discharge path with your arrangement.

That means there is a small current flow out from the pin. Vref is the high side of the 5 LED comparators in the datasheet block diagram. Placing it at a higher ab6884 within the datasheet’s max specified V will both lower the amplification and raise the lower rail of the comparators in the block diagram. Reverse biased capacitor on IC input pin Ask Question.

(Datasheet) AN pdf – 5-Dot LED Driver Circuit (1-page)

Post as a guest Name. It sounds like you’re trying to drive this circuit with a signal that includes a considerable DC bias, which explains why all of the LEDs light up right away when you remove short out the capacitor. So it determines the DC bias of the block capacitor’s polarity. I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps.


You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility. I am looking at the test circuits on the data sheet for the AN VU meter IC, and I cannot understand the connection to pin 8 in the following diagram: Sign up datasheet Facebook.

Pin 7 is the output of the internal amplifier, and pin 8 is its input, designed to accept a low-level AC input 57 mV for a 0-dB indication. The LED pins connect to the negative side of the LEDs, and the pins go low when the output of the internal amp goes above Vref dropped by voltage dividing resistors at each comparator.

Have you tried a non-polarized capacitor e. I’m not reading it that way. If I remove the 2. If I “correct” the orientation, the circuit does not work at all.

Sign up using Email and Password. By “low side”, you’re referring to the inverting inputs of the comparators.

5+1 led vu-meter with AN6884

Passing Vin through a reverse capacitor seems to be potentially more prone to failure. This circuit will light the LEDs as the input voltage on pin datasueet increases relative to pin 7.


I’m not following you. Can someone explain what the reversed capacitor is doing here? Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Capacitor with polarity can be used ac couple or blocking. Your description doesn’t agree with that in the datasheet. It appears to be reversed.

AN Datasheet pdf – 5-Dot LED Driver Circuit – Panasonic

Sign up or log in Sign up using Google. That’s clear, because the input in my test circuit is DC. That is to say that the LEDs all come on at a much smaller turn of the potentiometer. However, if that’s the case, I can’t explain why reversing the capacitor doesn’t work, unless the actual polarity of the capacitor is backwards from what you think it is.

Home Questions Tags Users Unanswered. Setting 7 higher than ground biases the low side of the comparators, datasheer them to turn on with a lower output from the amp.

Pin 8 accepts a positive input voltage. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram.