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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LM used in IR controller. 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.
Natsemi – looks familiar: Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. By clicking “Post Your Datashewt, 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.
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. The Philips data ln567 makes design easy [tm]. Here is an online calculator for all tone related components.
Sign up or log in Sign up using Google. 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.
LM datasheet, Pinout ,application circuits Tone Decoder – National Semiconductor
Russell McMahon k 9 Post Your Answer Discard By clicking “Post Your Answer”, you datashfet 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. Sign up using Email and Password. Lots of ideas – each image links to a page. Currently I use 2. Home Questions Tags Users Unanswered. Sign up using Facebook. C3 sets the band edge of a low-pass filter which attenuates frequencies outside the detection band to eliminate spurious outputs.
Rl on pin 8 in the diagram below.
Shockingly poor wrt applications. TI LM data sheet here – Detailed design requirements are given lm5677 section What you and other sources online have demonstrated is how to determine the detection frequency using C1 and R1. Without this the device is about as good at detecting tones as is a pillar of salt. Post as a guest Name. I think it comes down to the input filter capacitor and output filter capacitor connected to the Link to datasheet – for the at lm657
I’m making a wireless remote control system using the and IC’s. 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. The tone I’m trying to detect is a tone at catasheet.
By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Page contains most of what you need to know, but there is also much more there that is useful. How exactly does datasheer calculate the proper filter capacitors for the tone detector?
Email Required, but never shown. Such delay may be desirable to avoid spurious outputs due to transient frequencies.
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.
Output is low when tone is ‘detected’. What equation do I use for the input and output filter capacitor for the to successfully detect a 5Khz tone?