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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Omschrijving Prijs 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-stocknr. 885-0768
FabrikantnummerHT9170D-18SOP
FabrikantHoltek
1,108 €
Each (In a Tube of 42)
Aantal stuks
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-stocknr. 100-0709
FabrikantnummerLM567CN/NOPB
1,63 €
Each (In a Tube of 40)
Aantal stuks
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-stocknr. 460-819
FabrikantnummerLM567CN/NOPB
1,914 €
Each (In a Pack of 5)
Aantal stuks
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-stocknr. 170-3561
FabrikantnummerMC74HC138ADR2G
FabrikantON Semiconductor
0,082 €
Each (On a Reel of 2500)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS-stocknr. 806-1413
FabrikantnummerMC74HC138ADR2G
FabrikantON Semiconductor
0,264 €
Each (On a Tape of 50)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS-stocknr. 689-8709
FabrikantnummerMC74HC138ADG
FabrikantON Semiconductor
0,306 €
Each (In a Pack of 5)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS-stocknr. 663-0509
FabrikantnummerCD74HCT154M
0,77 €
Each (In a Pack of 5)
Aantal stuks
- - - - Surface Mount SOIC 24 15.4 x 7.52 x 2.35mm 2.35mm 15.4mm 5.5 V +125 °C - 4.5 V
RS-stocknr. 122-0107
FabrikantnummerMC74HC138ADG
FabrikantON Semiconductor
0,224 €
Each (In a Tube of 48)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 6 V +125 °C - 2 V
RS-stocknr. 368-6039
FabrikantnummerSN74LS138N
0,60 €
Each (In a Tube of 25)
Aantal stuks
- - - - 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-stocknr. 662-8617
FabrikantnummerSN74LVC138ADR
0,232 €
Each (In a Pack of 10)
Aantal stuks
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 3.6 V +85 °C - 1.65 V
RS-stocknr. 798-8897
Fabrikantnummer74AHC138S16-13
FabrikantDiodesZetex
0,055 €
Each (In a Pack of 25)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm 5.5 V +125 °C - 2 V
RS-stocknr. 144-9997
FabrikantnummerCD74HC238E
0,394 €
Each (In a Tube of 25)
Aantal stuks
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +125 °C - 2 V
RS-stocknr. 709-2034
FabrikantnummerCD74HC238E
0,394 €
Each (In a Pack of 10)
Aantal stuks
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +125 °C - 2 V
RS-stocknr. 527-158
FabrikantnummerSN74HC138D
0,321 €
Each (In a Tube of 40)
Aantal stuks
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +85 °C - 2 V
RS-stocknr. 145-0668
FabrikantnummerSN74LS42N
1,609 €
Each (In a Tube of 25)
Aantal stuks
- - - - 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-stocknr. 304-065
FabrikantnummerSN7445N
2,50 €
Each
Aantal stuks
- - - - 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-stocknr. 526-921
FabrikantnummerSN74HC139D
0,334 €
Each (In a Tube of 40)
Aantal stuks
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +85 °C - 2 V
RS-stocknr. 178-6970
FabrikantnummerHEF4543BT,652
FabrikantNexperia
0,118 €
Each (In a Tube of 50)
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
RS-stocknr. 145-0465
FabrikantnummerCD4028BE
0,348 €
Each (In a Tube of 25)
Aantal stuks
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS-stocknr. 355-9460
FabrikantnummerHEF4543BT,652
FabrikantNexperia
0,14 €
Each
Aantal stuks
- - - - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm 15 V +85 °C - 3 V
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