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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Omschrijving Prijs 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-stocknr. 885-0768
FabrikantnummerHT9170D-18SOP
FabrikantHoltek
1,089 €
Each (In a Tube of 42)
Aantal stuks
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-stocknr. 460-819
FabrikantnummerLM567CN/NOPB
1,926 €
Each (In a Pack of 5)
Aantal stuks
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
RS-stocknr. 100-0709
FabrikantnummerLM567CN/NOPB
1,631 €
Each (In a Tube of 40)
Aantal stuks
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-stocknr. 313-8091
FabrikantnummerNJM2211D
FabrikantNew Japan Radio
1,45 €
Each
Aantal stuks
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS-stocknr. 173-2495
FabrikantnummerNJM2211D
FabrikantNew Japan Radio
1,314 €
Each (In a Tube of 50)
Aantal stuks
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS-stocknr. 102-5740
FabrikantnummerLM567CM/NOPB
1,687 €
Each (In a Tube of 95)
Aantal stuks
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-stocknr. 536-0953
FabrikantnummerLM567CM/NOPB
1,69 €
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 178-2377
FabrikantnummerNJM567M
FabrikantNew Japan Radio
0,882 €
Each (In a Tube of 100)
Aantal stuks
- - - - Surface Mount DMP 8 5 x 5 x 1.6mm 1.6mm 5mm - +85 °C - -40 °C
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