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MFG:DIP-14  Package Cooled:.  D/C:2004+  

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75T Series Datasheet download

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Part Number: 75T204

 

MFG: DIP-14

Package Cooled: .

D/C: 2004+

Description: The 75T204 is a complete Dual-Tone Multifrequency (DTMF) receiver that detects 16 standard digits. No fron...


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75T204 General Description


   The 75T204 is a complete Dual-Tone Multifrequency (DTMF) receiver that detects 16 standard digits. No front-end pre-filtering is needed. The only external components required are an inexpensive 3.58-MHz television "colorburst" crystal for frequency reference and a bias resistor. An Alternate Time Base (ATB) is provided to permit operation of up to 10 75T204's from a single crystal. The 75T204 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. Eight bandpass filters detect the individual tones. Digital processing is used to measure the tone and pause durations and to provide output timing and decoding. The outputs interface directly to standard CMOS circuitry and are three-state enabled to facilitate bus-oriented architectures.

75T204 Maximum Ratings

PARAMETER RATING
DC Supply Voltage- VP +7V
Operating Temperature -40°C to +85°C Ambient
Storage Temperature -65°C to +150°C
Power Dissipation (25°C) 65mW
Input Voltage (All inputs except ANALOG IN) (VP + 0.5V) to -0.5V
ANALOG IN Voltage (VP + .5V) to (VP - 10V)
DC Current into any Input ±1.0mA
Lead Temperature - Soldering, 10 sec. 300°C

75T204 Features

· Intended for applications with less requirements than the 75T202/75T203
· 14-pin plastic DIP or 16-pin SO package for high system density
· NO front-end band-splitting filters required
· Single low-tolerance 5-volt supply
· Detects all 16 standard DTMF digits.
· Uses an inexpensive 3.579545-MHz crystal
· Excellent speech immunity
· Output in 4-bit hexadecimal code
· Three-state outputs for microprocessor interface

75T204 Connection Diagram

75T204 Connection Diagram

75T204 datasheet

75T204
PDF/DataSheet Download

Find 75T204 Suppliers

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