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 Prix 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
N° de stock RS 171-3556
Référence fabricant74HC138D
MarqueToshiba
0,26 €
Each (In a Pack of 50)
Unité
- - - - Surface Mount SOIC 16 10.2 x 3.9 x 1.38mm 1.38mm 10.2mm 6 V +125 °C - 2 V
N° de stock RS 171-3447
Référence fabricant74VHC139FT
MarqueToshiba
0,06 €
Each (In a Pack of 50)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V
N° de stock RS 171-3405
Référence fabricant74VHCT138AFT
MarqueToshiba
0,10 €
Each (In a Pack of 50)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 4.5 V
N° de stock RS 171-3332
Référence fabricant74VHC238FT
MarqueToshiba
0,07 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V
N° de stock RS 171-3478
Référence fabricant74VHC238FT
MarqueToshiba
0,072 €
Each (In a Pack of 50)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V
N° de stock RS 171-3360
Référence fabricant74VHCT138AFT
MarqueToshiba
0,09 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 4.5 V
N° de stock RS 171-3291
Référence fabricant74LCX138FT
MarqueToshiba
0,082 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 3.6 V +125 °C AEC-Q100 1.65 V
N° de stock RS 171-3433
Référence fabricant74VHC138FT
MarqueToshiba
0,221 €
Each (In a Pack of 50)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V
N° de stock RS 171-3517
Référence fabricant74LCX138FT
MarqueToshiba
0,084 €
Each (In a Pack of 25)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 3.6 V +125 °C AEC-Q100 1.65 V
N° de stock RS 171-3382
Référence fabricant74HC138D
MarqueToshiba
0,091 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount SOIC 16 10.2 x 3.9 x 1.38mm 1.38mm 10.2mm 6 V +125 °C - 2 V
N° de stock RS 171-3320
Référence fabricant74VHC139FT
MarqueToshiba
0,064 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V
N° de stock RS 171-3318
Référence fabricant74VHC138FT
MarqueToshiba
0,077 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm 5.5 V +125 °C AEC-Q100 2 V