(China (Mainland))
Product Summary
The 75T204-IL is a complete Dual-Tone Multifrequency(DTMF) receiver that detects 16 standard digits. No front-end pre-filtering is needed. The only external component of the 75T204-IL required are an inexpensive 3.58-MHz television “colorburst” crystal for frequency reference and a bias resistor. The 75T204-IL employs state-ofthe-art “switched-capacitor” filter technology, resulting in approximately 40 poles of filtering, and digital circuitry on the same CMOS chip. The analog input signal is pre-processed by 60-Hz reject and band split filters and then zero-cross detected to provide AGC.
Parametrics
75T204-IL absolute maximum ratings: (1)DC Supply Voltage - VP: +7V; (2)Operating Temperature: -40℃ to +85℃ Ambient; (3)Storage Temperature: -65℃ to +150℃; (4)Power Dissipation (25℃): 65mW; (5)Input Voltage (All inputs except ANALOG IN): (VP + 0.5V) to -0.5V; (6)ANALOG IN Voltage: (VP + .5V) to (VP - 10V); (7)DC Current into any Input: ±1.0mA; (8)Lead Temperature - Soldering, 10 sec.: 300℃.
Features
75T204-IL features: (1)Intended for applications with less requirements than the 75T202/75T203; (2)14-pin plastic DIP or 16-pin SO package for high system density; (3)NO front-end band-splitting filters required; (4)Single low-tolerance 5-volt supply; (5)Detects all 16 standard DTMF digits.; (6)Uses an inexpensive 3.579545-MHz crystal; (7)Excellent speech immunity; (8)Output in 4-bit hexadecimal code; (9)Three-state outputs for microprocessor interface.
Diagrams
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75T2091 |
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