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TDA1548TZ データシート(PDF) 2 Page - NXP Semiconductors |
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TDA1548TZ データシート(HTML) 2 Page - NXP Semiconductors |
2 / 20 page 1995 Nov 15 2 Philips Semiconductors Product specification Bitstream continuous calibration filter-DAC with headphone driver and DSP TDA1548T FEATURESPRODUCT SPECIFICATION Easy application • Only first-order analog post-filtering required • Headphone amplifiers and digital filter integrated • Component saving common headphone output • Selectable system clock (SYSCLK) 64f s, 256fs or 384fs • 16, 18 or 20 bits I2S-bus or LSB justified serial input format • Input pins suitable with 5 V low supply voltage interfacing • Small package (SSOP28) • Single rail supply (3 V). High performance • Superior signal-to-noise ratio • Wide dynamic range • Continuous calibration digital-to-analog conversion combined with noise shaping technique. Features • Low power dissipation • Digital volume control • Soft mute • Digital tone control (Bass Boost and Treble) • Digital de-emphasis • Analog control of digital sound control functions. GENERAL DESCRIPTION The TDA1548T is a dual CMOS digital-to-analog converter (DAC) with up-sampling filter and noise shaper and integrated headphone driver featuring unique signal processing functions. The digital processing features are of high sound processing quality due to the wide dynamic range of the bitstream conversion technique. The TDA1548T supports the I2S-bus data input mode with word lengths of up to 20 bits and the LSB justified serial data input format with word lengths of 16, 18 or 20 bits. The clock system is selectable (64fs, 256fs or 384fs) by means of selection pins. Two cascaded half band filters, linear interpolator and a sample-and-hold function increase the oversampling rate from 1fs to 64fs. A second-order noise shaper converts this oversampled data into a bitstream for the 5-bit continuous calibration DACs. On board amplifiers convert the output current to a voltage signal capable of driving a headphone or line output. The common operational amplifier application eliminates the need for capacitors. The TDA1548T has some sound processing functions which are controllable by a potentiometer. These functions are volume, bass boost and treble. The flat/min/max switch can also be controlled by a potentiometer. The analog values are converted to a digital code, which is then further translated internally to a set of coefficients for either volume, bass boost or treble. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA1548T SO28 plastic small outline package; 28 leads; body width 7.5 mm SOT136-1 TDA1548TZ SSOP28 plastic shrink small outline package; 28 leads; body width 5.3 mm SOT341-1 |
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