DTMF Decoders

DTMF (Dual Tone Multi-Frequency) decoders are devices that receive data transmissions in amateur radio frequency bands. They constantly monitor incoming signals for valid DTMF digits. These electronic circuits decode DTMF dial tones from telephone lines into touch-tone phones via a process known as tone dialing. 


The basic DTMF decoder identifies tones from a normal touch-tone phone. It then activates an LED to provide a 4-bit binary signal as an output code.

 

DTMF decoders are tolerant of level variations, but function optimally at a 0dB range.


What are DTMF decoders used for?

DTMF decoders increase connectivity in electronics to allow better control of applications. Home applications like alarm systems, electronic gates and garage doors, intercom systems and everyday appliances make use of DTMF functionalities. 


Public switched telephone networks (PSTN) and voice response systems are other examples where DTMF application is necessary. 


Types of DTMF decoders

The most common types of DTMF Decoders include 2-tone, 5-tone, multi-tone and burst-tone versions. Multi-tone decoders receive and translate multiple tones from the source, and burst-tone versions decode clashing frequencies into binary signals 


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Beskrivning Pris Operating Frequency Fabrication Technology Typical Supply Current Minimum CMRR Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage Minimum Operating Temperature
RS-artikelnummer 313-8091
Tillv. art.nrNJM2211D
VarumärkeNew Japan Radio
16,54 kr
Each
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- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS-artikelnummer 173-2495
Tillv. art.nrNJM2211D
VarumärkeNew Japan Radio
13,109 kr
Each (In a Tube of 50)
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- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS-artikelnummer 885-0768
Tillv. art.nrHT9170D-18SOP
VarumärkeHoltek
12,095 kr
Each (In a Tube of 42)
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3.57 → 3.58MHz CMOS - 60dB Surface Mount SOP 18 11.76 x 7.62 x 2.34mm 2.34mm 11.76mm 5.5 V +75 °C 2.5 V -20 °C
RS-artikelnummer 102-5740
Tillv. art.nrLM567CM/NOPB
VarumärkeTexas Instruments
18,591 kr
Each (In a Tube of 95)
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0.5MHz Bipolar - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C 4.75 V 0 °C
RS-artikelnummer 536-0953
Tillv. art.nrLM567CM/NOPB
VarumärkeTexas Instruments
19,842 kr
Each (In a Pack of 10)
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0.5MHz Bipolar 12mA - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C 4.75 V 0 °C
RS-artikelnummer 100-0709
Tillv. art.nrLM567CN/NOPB
VarumärkeTexas Instruments
17,992 kr
Each (In a Tube of 40)
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0.5MHz Bipolar - - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm 3.3mm 9.27mm 9 V +70 °C 4.75 V 0 °C
RS-artikelnummer 460-819
Tillv. art.nrLM567CN/NOPB
VarumärkeTexas Instruments
20,328 kr
Each (In a Pack of 5)
Enheter
0.5MHz Bipolar 12mA - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm 3.3mm 9.27mm 9 V +70 °C 4.75 V 0 °C
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