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To be clear, removing the dtasheet doesn’t light up the LEDs all at once. There’s still a much shorter range over which a varying number of LEDs come on.

Sign up or log in Sign up using Google. 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. How does doing anything to pin 7 or pin 8 affect that? Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. 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.

That ah6884 there is a small current flow out from the pin.

Placing it at a an884 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. Datasbeet Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our datasueet terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. Email Required, but never shown. Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input. If I remove the 2. Your description doesn’t agree with that in the datasheet.


Fadecomic 2 6. Indeed, it must in order for any of the LEDs to turn on! This makes sense, but why not a diode? The diode will mess up the response of the chip due to its forward voltage drop. There is dxtasheet no discharge path with your arrangement.

(PDF) AN6884 Datasheet download

Very confusing terminology, since the inverting input can have a higher voltage than the noninverting input. That is to say that the LEDs all come on at a much smaller turn of the potentiometer.

I’m not reading it that way. I know the correct names, but I conversely find “inverting” and “noninverting” confusing when dealing with comparators, daatsheet 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.

AN6884 Datasheet

Passing Vin through a reverse capacitor seems to be potentially more prone to failure. Can someone explain what the reversed capacitor is doing here? Per AN’d datasheet. It’s the DC bias determine the polarity. Pin 8 accepts a positive input voltage. If I “correct” the orientation, the circuit does not work at all. I will be certain to use them here from now on.

By “low side”, you’re referring to the inverting inputs of the comparators. Have you tried a non-polarized capacitor e. So it determines the DC bias of the block capacitor’s polarity. 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 potentiometer is clear, but the 2.


As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer.

AN Datasheet(PDF) – Panasonic Semiconductor

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. That’s clear, because the input in my test circuit is DC. This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7. Most dataseet use “low” to refer to either a lower voltage, or a lower position on the diagram.

Post as a guest Name. Vref is the high side of the 5 LED comparators in the datasheet block diagram. I am looking at the test an684 on the data sheet for the AN VU meter IC, and I cannot understand the connection datsaheet pin 8 in the following diagram: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Sign up using Facebook. It appears to datashset reversed. You might want to edit to explain your answer a bit more. Capacitor with polarity can be used ac couple or blocking. Sign up using Email and Password. Home Questions Tags Users Unanswered. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp. Reverse biased capacitor on IC input pin Ask Datasjeet.

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