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TDA1549T Datasheet(PDF) 2 Page - NXP Semiconductors |
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TDA1549T Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 20 page  August 1994 2 Philips Semiconductors Objective specification Stereo 4fs data input up-sampling filter with bitstream continuous calibration DAC (BCC-DAC1) TDA1549T FEATURES • Easy application • Finite-duration impulse-response (FIR) filtering and noise shaping incorporated • 2nd-order noise shaper • Wide dynamic range (true 18-bit resolution) • Low total harmonic distortion • No zero-crossing distortion • Superior signal-to-noise ratio • Bitstream continuous calibration conversion concept • Inherently monotonic • Voltage output (1.5 V RMS) at line drive level • Single supply rail (3.8 to 5.5 V) • Optimum output voltage level over the entire supply range • Small outline packaging (SO16) • Wide operating temperature range (−30 to +85 °C) • Standard Japanese input format • No analog post-filtering required • Low power consumption • Integrated operational amplifiers. GENERAL DESCRIPTION The TDA1549T (BCC-DAC1) is the first of a new generation of digital-to-analog converters featuring a unique combination of bitstream and continuous calibration concepts. A system of digital filtering, high oversampling, 2nd order noise shaping and continuous calibration digital-to-analog conversion ensures that only simple 1st order analog filtering is required. The circuit accepts 18-bit four times oversampled input data (4fs) in standard Japanese format. Internal FIR filters remove the main spectral components and increase the sampling rate to 96 times (96fs). A 2nd order noise shaper converts this oversampled data to a 5-bit data stream. For low signal levels the converter operates in the 1-bit bitstream mode with attendant high differential linearity. Higher level signals are reproduced using the dynamic continuous calibration technique, thereby guaranteeing high linearity independent of process variations, temperature effects and product ageing. High-precision, low-noise amplifiers convert the digital-to-analog current to an output voltage capable of driving a line output. Externally connected capacitors perform the required 1st order filtering so that no further post-filtering is required. Internal reference circuitry ensures that the output voltage is proportional to the supply voltage, thereby making optimum use of the supply voltage over a wide range (3.8 to 5.5 V). This unique configuration of bitstream and continuous calibration techniques, together with a high degree of analog and digital integration, results in a digital-to-analog conversion system with true 18-bit dynamic range, high linearity and simple low-cost application. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TDA1549T SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162 −1 |
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