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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Output filter capacitor C3 – From Philips data sheet page “The value of C3 is generally non-critical. Shockingly poor wrt applications. Sign up or log in Sign up using Google. Page contains most of what you need to know, but there is also much more there that is useful.
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. Currently I use 2. What you and other sources online have demonstrated is how to determine the detection frequency using Llm567 and R1.
TI Dataeheet data sheet here – Detailed design requirements are given in section Andy aka k 10 Home Questions Tags Users Unanswered. I can’t accept this answer because I’m trying to figure out how to calculate values of C3 and C2. Russell McMahon k 9 Without this the device is about as good at detecting tones as is a pillar of salt.
I’m making a wireless remote control datazheet using the and IC’s. Such delay may be desirable to avoid spurious outputs due to transient frequencies. Lots of ideas – each image links to a page.
Rl on pin 8 in the diagram below. 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.
Here is an online calculator for all tone related satasheet. How exactly does one calculate the proper filter capacitors for the tone detector? 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 Facebook. Email Required, but never shown. What equation do I use for the input and output filter capacitor for the to successfully detect a 5Khz tone?
Sign up using Email and Password. Natsemi – looks familiar: The tone I’m trying to detect is a tone at 5Khz.
Tone Decoder – National Semiconductor
Link to datasheet – for the at least?