Part Number: LM, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor. The LM and LMC are general purpose tone decod- ers designed to provide a saturated transistor switch to ground when an input signal is present within. DESCRIPTION. The NE/SE tone and frequency decoder is a highly stable phase-locked loop with synchronous AM lock detection and.

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TI LM data sheet here – Detailed design requirements are given in section C3 sets the band edge of a low-pass filter which attenuates frequencies outside the detection band to eliminate spurious outputs.

The tone I’m trying to detect is a tone at 5Khz. LM used in IR controller. Here is an online calculator for all tone related components.

What equation do I use for the input and llm567 filter capacitor for the to successfully detect a 5Khz tone? Such delay may be desirable to avoid spurious outputs due to transient frequencies. The Philips data sheet makes design easy [tm].

Output is low when tone is ‘detected’.

LM567 Datasheet PDF

Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. It is likely that the lack of output is due to you not having allowed for the fact that the LM has an “open collector” output. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Currently I use 2. Sign up using Facebook.

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Datasheer this the device is about as good at detecting tones as is a pillar of salt.

Natsemi – looks familiar: Everything is working OK with the exception of the tone detector, yet I can hear the tone when I hook up a speaker to my circuit at the point where the tone detector can pick the same noise up. 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.

Dwtasheet up using Email and Password. 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. Shockingly poor wrt applications. Home Questions Tags Users Unanswered.

LM datasheet, Pinout ,application circuits Tone Decoder – National Semiconductor

Email Required, but never shown. I’m making a wireless remote control system using the and IC’s. I think it comes down to the input filter capacitor and output filter capacitor connected to the I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2.

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If C3 is too small, frequencies just outside the detection band will switch the output stage on dafasheet off at the beat frequency, or the output may pulse on and off during the turn-on transient. Link to datasheet – for the at least? Andy aka k 10 What you datashfet other sources online have demonstrated is how to determine the detection frequency using C1 and R1.

National Semiconductor

Rl on pin 8 in the diagram below. Sign up or log in Sign up using Google. If C3 is too large, turn-on and turn-off of the output stage will be delayed until the voltage on C3 passes the threshold voltage. How exactly does one calculate the proper filter capacitors for the tone detector?

Datashfet McMahon k 9 Page datasgeet most of what you need to know, but there is also much more there that is useful. Post as a guest Name. Lots of ideas – each image links to a page.

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