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AN Datasheet(PDF) – Panasonic Semiconductor

There’s still a much shorter range over which a varying number of LEDs come on. That means there is a small current flow out from the pin. I’m not reading it that way. Can someone datashewt what the reversed capacitor is doing here? By “low side”, you’re referring to the inverting inputs of the comparators. Reverse biased capacitor on IC input pin Ask Question.

This makes sense, but why not a diode? Per AN’d datasheet. There is also no discharge path with your arrangement. I am looking at the test circuits on the data sheet for the AN VU meter IC, catasheet I cannot understand the connection to pin 8 in the following diagram: I will be certain to use them here from now on. It just shortens the range of turn over which the potentiometer works.

If I remove the 2. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input.

I’m not following you. It appears to be reversed. That’s clear, because the input in my test circuit is DC. To be clear, removing the capacitor an68884 light up the LEDs all at once. 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.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Pin 7 is the output of the internal amplifier, and pin 8 xn6884 its input, designed to accept a low-level AC input 57 mV for a 0-dB indication. Sign up using Facebook. Dstasheet might want to edit to explain your answer a bit more. Indeed, it must in order for any of the LEDs to turn on!

Sign up or log in Sign up using Google. If I “correct” the orientation, the circuit does not work at all. 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 datashset.

Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input.

AN6884 Datasheet

Home Questions Tags Users Unanswered. Fadecomic 2 datxsheet. 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. 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.

AN6884 Datasheet PDF

Have you tried a non-polarized capacitor e. Post as a guest Name. Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Email Required, but never shown. Sign up using Email and Password. Placing it at a higher voltage within the datasheet’s max specified V will both lower the amplification and raise the lower rail of the comparators in the block diagram. So it determines the DC bias of the block capacitor’s polarity.


Pin 8 accepts a positive input voltage. Your description doesn’t agree with that in the datasheet. Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. 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.

Vref is the high side of the 5 LED comparators in the datasheet block diagram. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. You should fix the capitalisation of sentences and electrical units ‘F’ for farad to improve legibility and credibility.

Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input.

Most people use “low” to refer to either a lower voltage, or a lower position on the diagram. By clicking “Post Your Answer”, you acknowledge that datashdet have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.