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Title: [req] looking for a datasheet about this IC: "TDA 1077 P" Post by: zuisti on June 14, 2010, 10:22:05 10:22 Hi all;
I'm looking a long ago for any info about this old phone IC (TDA 1077 P, Philips ?). I think this is a DTMF encoder (generator ?) for a normal phone 3x4 key matrix. Google cannot help, at least to me ... I need a datasheet (PDF) or any app info with a working schematic. Please help me! Thanks zuisti Title: Re: [req] looking for a datasheet about this IC: "TDA 1077 P" Post by: zuisti on June 18, 2010, 10:23:49 10:23 Hi my friends;
Please help me! Looked :) an article at ieeexplore: "The TDA1077-an I/sup 2/L circuit for two-tone telephone dialing" The link: ieeexplore.ieee.org/iel5/4/22554/01050884.pdf?arnumber=1050884 Unfortunately I cannot download it... Abstract The circuit-design aspects of an integrated circuit to perform two-tone telephone dialing are described. The circuit is believed to be unique in that it combines both the crystal-controlled frequency synthesizer and the output amplifier on the same chip. Moreover, no external power supplies are required; the circuit is powered by the telephone-line current. Designed to require a minimum number of external components, the LSI chip provides an economical and accurate two-tone dialing unit. A typical application circuit for existing telephone apparatus is shown and aspects of future development are discussed ... Please upload this PDF to a file sharing site eq. ifile.it or ... Thanks a lot! zuisti Title: Re: [req] looking for a datasheet about this IC: "TDA 1077 P" Post by: 30f4011 on June 18, 2010, 10:35:08 10:35 Hi,
you may request ieee xplore material here: http://www.sonsivri.com/forum/index.php?topic=10773.0 |