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That means there is a small current flow out from the pin. Post as a guest Name. 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. How does doing anything to pin 7 or pin 8 affect that? 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.

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

Home Questions Tags Users Unanswered. There is also no discharge path with your arrangement. The datasheett is clear, but the 2. If I “correct” the orientation, the circuit does not work at all. Pin 8 accepts a positive input voltage. Have you tried a non-polarized capacitor e. I’m not following you. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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. Sign up using Email and Password. As displayed, the LEDs go from fully off to fully on over roughly the entire turn range of the potentiometer. Your description doesn’t agree with that in the datasheet.


Fadecomic 2 6. You might want to edit to explain your answer a bit more. To be clear, removing the capacitor doesn’t light up the LEDs all at once. 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: This circuit will light the LEDs as the input voltage on pin 8 increases relative to pin 7.

AN6884 Datasheet

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 datashest policies. Vref is the high side of the 5 LED comparators in the datasheet block diagram.

Can someone explain what the reversed capacitor is doing here? If I remove the 2. It’s the DC bias determine the polarity.

This makes sense, datasheeh why not a diode? That’s clear, because the input in my test circuit is DC. Capacitor with polarity can be used ac couple or blocking.

AN Datasheet PDF –

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. Per AN’d datasheet. Reverse biased capacitor on IC input pin Ask Question. There’s still a much shorter range over which a varying number of Datasneet come on. Setting 7 higher than ground biases the low side of the comparators, allowing them to turn on with a lower output from the amp.

It just shortens the range of turn over which the potentiometer works. Sign up using Facebook. Most people use “low” to refer to either a lower voltage, or a lower position on the diagram.

(PDF) AN6884 Datasheet download

I will be certain to use them here from now on. You should fix the capitalisation of sentences xn6884 electrical units ‘F’ for farad to improve legibility and credibility.


The diode will mess up the response of the chip due to its forward voltage drop. Pin 8 is the signal input pin, and it’s the internal Op amp’s positive input. So it determines the DC bias of the block capacitor’s polarity.

Passing Vin dataaheet a reverse capacitor seems to be potentially more prone to failure. 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.

I know the correct names, datasheeet I conversely find “inverting” and “noninverting” confusing when dealing with comparators, since those terms make more sense when dealing with op-amps.

Very confusing terminology, since the datasheef input can have a higher voltage than the noninverting input. By “low side”, you’re referring to the inverting inputs of the comparators. 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.

Email Required, but never shown. I’m not reading it that way. Right, I get that pin 7 is the output of the amp, but it’s part of the negative feedback loop on the amp. Indeed, it must in order for any of the LEDs to turn on!

It appears to be reversed.

Sign up or log in Sign up using Google. Per AN’d datasheetPin 8 is the signal input pin, and it’s the internal Op amp’s positive input.