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 Minimum Operating Supply Voltage Minimum Operating Temperature
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 -20 °C
N° de stock RS 100-0709
Référence fabricantLM567CN/NOPB
1,674 €
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 0 °C
N° de stock RS 460-819
Référence fabricantLM567CN/NOPB
1,822 €
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 0 °C
N° de stock RS 173-2495
Référence fabricantNJM2211D
1,268 €
Each (In a Tube of 50)
Unité
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
N° de stock RS 313-8091
Référence fabricantNJM2211D
1,47 €
Each
Unité
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
N° de stock RS 102-5740
Référence fabricantLM567CM/NOPB
1,752 €
Each (In a Tube of 95)
Unité
0.5MHz Bipolar - - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C 4.75 V 0 °C
N° de stock RS 536-0953
Référence fabricantLM567CM/NOPB
1,919 €
Each (In a Pack of 10)
Unité
0.5MHz Bipolar 12mA - Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 1.45mm 4.9mm 9 V +70 °C 4.75 V 0 °C
N° de stock RS 178-2377
Référence fabricantNJM567M
0,898 €
Each (In a Tube of 100)
Unité
- - - - Surface Mount DMP 8 5 x 5 x 1.6mm 1.6mm 5mm - +85 °C - -40 °C