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 885-0768
Référence fabricantHT9170D-18SOP
MarqueHoltek
1,108 €
Each (In a Tube of 42)
Unité
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
N° de stock RS 100-0709
Référence fabricantLM567CN/NOPB
1,63 €
Each (In a Tube of 40)
Unité
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
N° de stock RS 460-819
Référence fabricantLM567CN/NOPB
1,914 €
Each (In a Pack of 5)
Unité
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
N° de stock RS 806-1413
Référence fabricantMC74HC138ADR2G
0,264 €
Each (On a Tape of 50)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
N° de stock RS 170-3561
Référence fabricantMC74HC138ADR2G
0,082 €
Each (On a Reel of 2500)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
N° de stock RS 368-6039
Référence fabricantSN74LS138N
0,60 €
Each (In a Tube of 25)
Unité
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
N° de stock RS 689-8709
Référence fabricantMC74HC138ADG
0,306 €
Each (In a Pack of 5)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
N° de stock RS 122-0107
Référence fabricantMC74HC138ADG
0,224 €
Each (In a Tube of 48)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
N° de stock RS 663-0509
Référence fabricantCD74HCT154M
0,77 €
Each (In a Pack of 5)
Unité
- - - - Surface Mount SOIC 24 15.4 x 7.52 x 2.35mm 2.35mm 15.4mm 5.5 V +125 °C - 4.5 V
N° de stock RS 798-8897
Référence fabricant74AHC138S16-13
MarqueDiodesZetex
0,055 €
Each (In a Pack of 25)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 5.5 V +125 °C - 2 V
N° de stock RS 527-158
Référence fabricantSN74HC138D
0,321 €
Each (In a Tube of 40)
Unité
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +85 °C - 2 V
N° de stock RS 709-2037
Référence fabricantCD4028BE
0,347 €
Each (In a Pack of 10)
Unité
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
N° de stock RS 144-9997
Référence fabricantCD74HC238E
0,394 €
Each (In a Tube of 25)
Unité
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +125 °C - 2 V
N° de stock RS 355-9460
Référence fabricantHEF4543BT,652
MarqueNexperia
0,14 €
Each
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
N° de stock RS 145-6103
Référence fabricantSN7445N
2,14 €
Each (In a Tube of 25)
Unité
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
N° de stock RS 162-6504
Référence fabricantCD4511BPW
0,351 €
Each (In a Tube of 90)
Unité
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 18 V +125 °C - 3 V
N° de stock RS 809-6220
Référence fabricantCD4511BPW
0,351 €
Each (In a Pack of 15)
Unité
- - - - Surface Mount TSSOP 16 5.1 x 4.5 x 1.05mm 1.05mm 5.1mm 18 V +125 °C - 3 V
N° de stock RS 178-6970
Référence fabricantHEF4543BT,652
MarqueNexperia
0,118 €
Each (In a Tube of 50)
Unité
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
N° de stock RS 307-575
Référence fabricantSN74LS42N
1,89 €
Each
Unité
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.25 V +70 °C - 4.75 V
N° de stock RS 662-8617
Référence fabricantSN74LVC138ADR
0,232 €
Each (In a Pack of 10)
Unité
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 3.6 V +85 °C - 1.65 V