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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Description Price 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 Automotive Standard Minimum Operating Supply Voltage
RS Stock No. 122-2833
Mfr. Part No.74HC138S16-13
€0.109
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 798-9023
Mfr. Part No.74HC138S16-13
€0.289
Each (In a Pack of 25)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 460-819
Mfr. Part No.LM567CN/NOPB
€1.914
Each (In a Pack of 5)
units
0.5MHz Bipolar 12mA - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 100-0709
Mfr. Part No.LM567CN/NOPB
€1.63
Each (In a Tube of 40)
units
0.5MHz Bipolar - - Through Hole MDIP 8 9.27 x 6.35 x 3.3mm - - 9 V +70 °C - 4.75 V
RS Stock No. 145-1076
Mfr. Part No.SN74LS145D
€0.828
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V +70 °C - 4.75 V
RS Stock No. 885-0702
Mfr. Part No.HT12D-18DIP
BrandHoltek
€0.588
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 18 23.37 x 7.11 x 4.95mm 4.95mm 23.37mm 12 V +75 °C - 2.4 V
RS Stock No. 663-2410
Mfr. Part No.SN74LS145D
€0.972
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.25 V +70 °C - 4.75 V
RS Stock No. 662-9698
Mfr. Part No.CD4511BE
€0.50
Each (In a Pack of 5)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 304-065
Mfr. Part No.SN7445N
€2.50
Each
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 689-8709
Mfr. Part No.MC74HC138ADG
€0.306
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 663-0045
Mfr. Part No.CD74HC138M
€0.53
Each (In a Pack of 5)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +125 °C - 2 V
RS Stock No. 145-6103
Mfr. Part No.SN7445N
€2.14
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
RS Stock No. 806-1413
Mfr. Part No.MC74HC138ADR2G
€0.264
Each (On a Tape of 50)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 170-3561
Mfr. Part No.MC74HC138ADR2G
€0.082
Each (On a Reel of 2500)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 122-0107
Mfr. Part No.MC74HC138ADG
€0.224
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 145-0006
Mfr. Part No.CD4056BEE4
€0.325
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 922-2903
Mfr. Part No.CD4511BE
€0.392
Each (In a Tube of 25)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 709-2315
Mfr. Part No.CD4056BEE4
€0.457
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS Stock No. 145-0138
Mfr. Part No.CD4056BM
€0.351
Each (In a Tube of 40)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 18 V +125 °C - 3 V
RS Stock No. 662-9648
Mfr. Part No.CD4056BM
€0.376
Each (In a Pack of 10)
units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 18 V +125 °C - 3 V
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