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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RS庫存編號 145-0381
製造零件編號SN74LS259BN
HK$7.923
毎管:25 個
單位
- - - - 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庫存編號 304-942
製造零件編號SN74LS259BN
HK$9.35
單位
- - - - 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庫存編號 305-406
製造零件編號SN7447AN
HK$24.78
單位
- - - - 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庫存編號 368-4724
製造零件編號SN7447AN
HK$21.784
毎管:25 個
單位
- - - - 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庫存編號 833-709
製造零件編號CD74HCT138M
HK$6.61
單位
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V +125 °C - 4.5 V
RS庫存編號 145-6398
製造零件編號CD74HCT138M96
HK$1.967
個 (在毎卷:2500)
單位
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V 125 °C - 4.5 V
RS庫存編號 662-7244
製造零件編號CD74HCT138M96
HK$3.461
/個 (每包:10個)
單位
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V +125 °C - 4.5 V
RS庫存編號 145-0082
製造零件編號CD74HCT138M
HK$5.026
毎管:40 個
單位
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 5.5 V 125 °C - 4.5 V
RS庫存編號 662-9698
製造零件編號CD4511BE
HK$5.108
/個 (每包:5個)
單位
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS庫存編號 922-2903
製造零件編號CD4511BE
HK$4.007
毎管:25 個
單位
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 18 V +125 °C - 3 V
RS庫存編號 144-9994
製造零件編號SN74HCT138N
HK$4.316
毎管:25 個
單位
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V +85 °C - 4.5 V
RS庫存編號 443-031
製造零件編號SN74HC138N
HK$3.88
單位
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 6 V +85 °C - 2 V
RS庫存編號 527-158
製造零件編號SN74HC138D
HK$3.409
毎管:40 個
單位
- - - - Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm 6 V +85 °C - 2 V
RS庫存編號 709-1983
製造零件編號SN74HCT138N
HK$3.981
/個 (每包:10個)
單位
- - - - Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm 5.5 V +85 °C - 4.5 V
RS庫存編號 662-8430
製造零件編號SN74LV138APWR
HK$2.657
/個 (每包:10個)
單位
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 5.5 V +85 °C - 2 V
RS庫存編號 483-6421
製造零件編號74HC154D,652
BrandNexperia
HK$6.87
/個 (每包:5個)
單位
- - - - Surface Mount SOIC 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V
RS庫存編號 178-6959
製造零件編號74HC154D,652
BrandNexperia
HK$5.263
毎管:30 個
單位
- - - - Surface Mount SOIC 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V
RS庫存編號 885-0702
製造零件編號HT12D-18DIP
BrandHoltek
HK$5.931
毎管:25 個
單位
- - - - Through Hole PDIP 18 23.37 x 7.11 x 4.95mm 4.95mm 23.37mm 12 V +75 °C - 2.4 V
RS庫存編號 162-7426
製造零件編號SN74LV138APWR
HK$0.961
個 (在毎卷:2000)
單位
- - - - Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm 5.5 V +85 °C - 2 V
RS庫存編號 170-8040
製造零件編號74HC154D,653
BrandNexperia
HK$2.432
個 (在毎卷:1000)
單位
- - - - Surface Mount SO 24 15.6 x 7.6 x 2.45mm 2.45mm 15.6mm 6 V +125 °C - 2 V