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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Link to datasheet – for the at least? If C3 is too small, frequencies just outside the detection band will switch the output stage on and off at the beat frequency, or the output may pulse on and off during the turn-on transient. Lots of ideas – each image links to a page.

Output is low when tone is ‘detected’.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. TI LM data sheet here – Detailed design requirements are given in section Natsemi – looks familiar: 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 datasjeet is subject to these policies. What you and other sources online have demonstrated is how to determine the detection frequency using C1 and R1.


Shockingly poor wrt applications.

Without this the device is about as good at detecting tones as is a pillar of salt. What equation do I use for the input and output filter capacitor for the to successfully detect a dztasheet tone?

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. Currently I use 2. I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2. Home Questions Tags Users Unanswered.

National Semiconductor – datasheet pdf

Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. Andy aka k 10 The tone I’m trying to detect is a dahasheet at 5Khz. Sign up using Facebook. Page contains most of what you need to know, but there is also much more there that is useful. LM used in IR controller. C3 sets the band edge of a datashet filter which attenuates frequencies outside the detection band to eliminate spurious outputs.

The Philips data sheet makes design easy [tm]. Post as a guest Name. Rl on pin 8 in the diagram below. Russell McMahon k 9 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.


How exactly does one calculate the proper filter capacitors for the tone detector?

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

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. 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.

Sign up using Email and Password. Such delay may be desirable to avoid spurious outputs due to transient frequencies.

Tone Decoder – National Semiconductor

I think it comes down to the input filter capacitor and output filter capacitor connected to the Here is an online calculator for all tone related components. I’m making a wireless remote control system using the and IC’s.

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