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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Sign up or log in Sign up using Google. Natsemi – looks familiar: The Philips data sheet makes design easy [tm].

Tone Decoder – National Semiconductor

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. Output is low when tone is ‘detected’.

Post as a guest Name. Russell McMahon k 9 Sign up using Email and Password.

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

C3 sets the band edge of a low-pass filter which attenuates frequencies outside the detection band to eliminate spurious outputs. Email Datahseet, but never shown. Shockingly poor wrt applications. 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.


National Semiconductor – datasheet pdf

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our datasheett terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Lots of ideas – each image links to a page.

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. 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. Home Questions Tags Users Unanswered. Page contains most of what you need to know, but there is also much more there that is useful.

Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical.

National Semiconductor

What you and other sources online have demonstrated is how to determine the detection frequency using C1 and R1. Link to datasheet – for the at least? Currently I use 2.

Such delay may be desirable to avoid spurious outputs due to transient frequencies. I think it comes down to the input filter capacitor and output filter capacitor connected to the By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Rl on pin 8 in the diagram below. What equation do I use for the input and output filter capacitor for the to successfully detect a 5Khz tone?

The tone I’m trying to detect is a tone at 5Khz.

TI LM data sheet here – Detailed design requirements are given in section 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. How exactly does one calculate the proper filter capacitors for l,567 tone detector?

Sign up using Facebook. Here is an online calculator for all tone related components. Andy aka k 10 I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2. LM used in IR controller. I’m making a wireless remote control system using the and IC’s. Without this the device is about as good at detecting tones as is a pillar of salt.