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. 100-0709
Mfr. Part No.LM567CN/NOPB
kr 16,254
Each (In a Tube of 40)
Units
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
RS Stock No. 460-819
Mfr. Part No.LM567CN/NOPB
kr 19,082
Each (In a Pack of 5)
Units
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
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
kr 3,438
Each (In a Tube of 25)
Units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS Stock No. 663-0045
Mfr. Part No.CD74HC138M
kr 5,184
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. 443-047
Mfr. Part No.SN74HC139N
kr 4,69
Each
Units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS Stock No. 663-2818
Mfr. Part No.SN74LVC138APW
kr 3,111
Each (In a Pack of 10)
Units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 3.6 V +85 °C - 1.65 V
RS Stock No. 689-8709
Mfr. Part No.MC74HC138ADG
kr 2,992
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. 145-4496
Mfr. Part No.74ACT138SC
kr 4,337
Each (In a Tube of 48)
Units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 5.5 V 85 °C - 4.5 V
RS Stock No. 125-0046
Mfr. Part No.MC74VHC139DTR2G
kr 1,312
Each (On a Reel of 2500)
Units
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 5.5 V +125 °C - 2 V
RS Stock No. 171-3517
Mfr. Part No.74LCX138FT
BrandToshiba
kr 0,876
Each (In a Pack of 25)
Units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 3.6 V +125 °C AEC-Q100 1.65 V
RS Stock No. 151-3387
Mfr. Part No.74HC4852D,118
BrandNexperia
kr 2,234
Each (On a Reel of 2500)
Units
- - - - Surface Mount SO 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS Stock No. 152-3694
Mfr. Part No.74LVC1G19GW,125
BrandNexperia
kr 1,007
Each (In a Pack of 100)
Units
- - - - Surface Mount TSSOP 6 2.2 x 1.35 x 1mm 1mm 2.2mm 5.5 V +125 °C - 1.65 V
RS Stock No. 483-6718
Mfr. Part No.74HCT238D,652
BrandNexperia
kr 4,506
Each (In a Pack of 10)
Units
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 5.5 V +125 °C - 4.5 V
RS Stock No. 806-3311
Mfr. Part No.MC14555BDG
kr 4,88
Each (In a Pack of 20)
Units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 18 V +125 °C - 3 V
RS Stock No. 709-2037
Mfr. Part No.CD4028BE
kr 4,417
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. 662-8433
Mfr. Part No.SN74LV139APWR
kr 2,423
Each (In a Pack of 10)
Units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 5.5 V +85 °C - 2 V
RS Stock No. 662-7014
Mfr. Part No.CD74HC139M96
kr 4,417
Each (In a Pack of 10)
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. 671-1582
Mfr. Part No.74LCX138M
kr 5,304
Each (In a Pack of 5)
Units
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 3.6 V +85 °C - 2 V
RS Stock No. 145-0881
Mfr. Part No.SN74AHC139D
kr 1,027
Each (In a Tube of 40)
Units
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V +85 °C - 2 V
RS Stock No. 145-0014
Mfr. Part No.SN74LS156N
kr 6,182
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
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