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TDA1546T Arkusz danych(PDF) 6 Page - NXP Semiconductors |
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TDA1546T Arkusz danych(HTML) 6 Page - NXP Semiconductors |
6 / 40 page January 1995 6 Philips Semiconductors Preliminary specification Bitstream Continuous Calibration DAC with digital sound processing (BCC-DAC) TDA1546T 4 GENERAL DESCRIPTION The TDA1546T is the first Bitstream Continuous Calibration digital-to-analog converter (BCC-DAC) to feature unique signal processing functions. In addition to the basic functions of digital filtering and digital-to-analog conversion, it offers such advanced digital signal processing functions as volume control, tone control, bass boost, peak or spectrum analyzer readout and many more convenient functions. The digital processing features are of high sound quality due to the wide dynamic range of the bitstream conversion technique. The TDA1546T accepts I2S-bus data input formats with word lengths of up to 20 bits and various Japanese serial data input formats with word lengths of 16, 18 and 20 bits. The circuit can operate as a master or slave with different system clocks (256fs or 384fs) and is therefore, eminently suitable for use in various applications such as DCC, CD, DAT and MD. The range of applications is further extended by an incorporated Digital Speaker System mode (DSS) with digital crossover filter. Four cascaded FIR filters and a sample-and-hold function increase the oversampling rate from 1fs to 96fs (384fs system clock) or 128fs (256fs system clock). A second-order noise shaper converts this oversampled data to a bitstream for the 5-bit DACs. The DACs are of the continuous calibration type and incorporate a special data coding technique, which contributes to a high signal-to-noise ratio and dynamic range. On-board amplifiers convert the output current to a voltage signal capable of driving a line output. Externally connected capacitors perform the required first-order filtering. Additional post filtering is not required. Fig.1 Digital audio reconstruction system using the TDA1546T. |
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