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 Minimum Operating Supply Voltage Minimum Operating Temperature
RS Stock No. 460-819
Mfr. Part No.LM567CN/NOPB
SGD2.452
Each (In a Pack of 5)
units
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
RS Stock No. 100-0709
Mfr. Part No.LM567CN/NOPB
SGD2.506
Each (In a Tube of 40)
units
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
RS Stock No. 536-0953
Mfr. Part No.LM567CM/NOPB
SGD2.259
Each (In a Pack of 10)
units
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
RS Stock No. 173-2495
Mfr. Part No.NJM2211D
SGD2.712
Each (In a Tube of 50)
units
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS Stock No. 102-5740
Mfr. Part No.LM567CM/NOPB
SGD2.404
Each (In a Tube of 95)
units
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
RS Stock No. 885-0768
Mfr. Part No.HT9170D-18SOP
BrandHoltek
SGD1.491
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 -20 °C
RS Stock No. 313-8091
Mfr. Part No.NJM2211D
SGD2.79
Each
units
- - - - Through Hole PDIP 14 19 x 6.4 x 3.4mm 3.4mm 19mm - +85 °C - -40 °C
RS Stock No. 178-2377
Mfr. Part No.NJM567M
SGD1.254
Each (In a Tube of 100)
units
- - - - Surface Mount DMP 8 5 x 5 x 1.6mm 1.6mm 5mm - +85 °C - -40 °C
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