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. 709-2315
Mfr. Part No.CD4056BEE4
$0.928
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. 145-0006
Mfr. Part No.CD4056BEE4
$0.666
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. 709-2160
Mfr. Part No.SN74LS247N
$2.042
Each (In a Pack of 5)
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. 121-9249
Mfr. Part No.SN74LS247N
$2.51
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. 885-0768
Mfr. Part No.HT9170D-18SOP
BrandHoltek
$2.228
Each (In a Tube of 42)
units
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
RS Stock No. 806-1413
Mfr. Part No.MC74HC138ADR2G
$0.527
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. 689-8709
Mfr. Part No.MC74HC138ADG
$0.612
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. 662-9698
Mfr. Part No.CD4511BE
$0.856
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. 922-2903
Mfr. Part No.CD4511BE
$0.796
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. 122-0107
Mfr. Part No.MC74HC138ADG
$0.446
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. 170-3561
Mfr. Part No.MC74HC138ADR2G
$0.166
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. 662-7070
Mfr. Part No.CD74HC238PWR
$0.673
Each (In a Pack of 10)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 6 V +125 °C - 2 V
RS Stock No. 663-0045
Mfr. Part No.CD74HC138M
$1.06
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. 162-6945
Mfr. Part No.CD74HC238PWR
$0.277
Each (On a Reel of 2000)
units
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 6 V +125 °C - 2 V
RS Stock No. 802-1358
Mfr. Part No.74VHC138M
$0.871
Each (In a Tube of 48)
units
- - - - Surface Mount SOIC 16 10 x 3.988 x 1.499mm 1.499mm 10mm 5.5 V +85 °C - 2 V
RS Stock No. 662-8102
Mfr. Part No.SN74HC139DR
$0.498
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 +85 °C - 2 V
RS Stock No. 144-9900
Mfr. Part No.SN74HC139N
$0.745
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. 144-9997
Mfr. Part No.CD74HC238E
$0.787
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 +125 °C - 2 V
RS Stock No. 178-9211
Mfr. Part No.SN74LS47D
$3.972
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. 709-2034
Mfr. Part No.CD74HC238E
$0.448
Each (In a Pack of 10)
units
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +125 °C - 2 V
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