{"product_id":"mt8870-dtmf-audio-decoder-telefontasten-auswerten","title":"MT8870 DTMF decoder - DIP-28 IC, 5 V, 16 key codes","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eDecoder for dual-tone multifrequency signals from telephone keys\u003c\/li\u003e \u003cli\u003eDecodes DTMF tones into parallel four-digit binary codes\u003c\/li\u003e \u003cli\u003eInput voltage 5 V\u003c\/li\u003e \u003cli\u003eOutputs for key codes and control logic\u003c\/li\u003e \u003cli\u003eDIP-28 IC package with integrated oscillator\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eProduct Description\u003c\/h3\u003e \u003cp\u003eThe DTMF decoder converts the acoustic signals from telephone keys into digital codes and is suitable wherever voice-frequency commands need to be detected and processed. Telephone devices emit two superimposed sine tones when a key is pressed; this decoder recognizes each of the 16 possible combinations and outputs the result as a four-digit binary code.\u003c\/p\u003e \u003cp\u003eThe component filters the two frequency components of each tone, decodes them, and provides the result on four parallel outputs. An additional control signal indicates whether a valid tone has been detected. The oscillator is already integrated into the IC, so no external clock source is required. With a 5 V operating voltage, the decoder can be connected directly to microcontroller boards and standard signal-processing boards.\u003c\/p\u003e \u003cp\u003eApplications include remote-control systems operated via telephone lines and the decoding of tone-dialing sequences in industrial systems. The decoder is also used in prototypes for voice and key return-channel applications. A classic scenario: a telephone system forwards incoming tones to the decoder, whose output code then controls a connected control module, such as a relay, or triggers an interrupt on a microcontroller.\u003c\/p\u003e \u003cp\u003eThe four output lines can be evaluated via simple digital inputs on the controlled system. Calibration is not required. A suitable audio input on the telephone system or audio device and a stable 5 V power supply for the IC are required.\u003c\/p\u003e \u003ch3\u003eSafety Notice\u003c\/h3\u003e \u003cp\u003eThe component is intended exclusively for building prototypes and for testing and development purposes. Use in telephone systems that are part of a building's electrical installation is not permitted. Work on or near electrical installations must be carried out by a qualified electrician. If you have questions about integration into existing systems, consult a qualified electrician before commissioning.\u003c\/p\u003e \u003ch4\u003eScope of Delivery\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e1x MT8870 DTMF - Audio Decoder, voice decoder module\u003c\/li\u003e \u003c\/ul\u003e","brand":"Funduino","offers":[{"title":"Default Title","offer_id":66045687464285,"sku":"F23108788","price":1.6,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1074\/5649\/5965\/files\/mt8870-dtmf-audio-decoder-telefontasten-auswerten-funduino-6291599.png?v=1791493141","url":"https:\/\/funduino.com\/en\/products\/mt8870-dtmf-audio-decoder-telephone-keypad-evaluation","provider":"Funduino","version":"1.0","type":"link"}