TDA1305T Stereo 1fs Data Input Up-sampling Filter With Bitstream Continuous Dual DAC (BCC-DAC2)

The TDA1305T is a new generation of filter-DAC which features a unique combination of bitstream and continuous calibration techniques. The converter functions as a bitstream converter for low signals while large signals are generated using the dynamic continuous calibration technique, thus resulting in low power consumption, small chip size and easy application. The TDA1305T is a dual CMOS DAC with up-sampling Filter and noise shaper. The combination of high oversampling up to 16fs , 2nd order noise shaping and continuous calibration conversion ensures that only simple 1st order Analog post filtering is required.The TDA1305T supports the I2S-bus data input mode with word lengths of up to 20 bits (at fsys = 256fs ) and the LSB fixed serial data input format with word lengths of 16, 18 and 20 bits (at fsys = 384fs ). Four cascaded FIR Filters increase the oversampling rate to 16 times. A sample-and-hold function increases the oversampling rate to 96 times (fsys = 384fs ) or 128 times (fsys = 256fs ). A 2nd 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 date coding. This ensures an extremely high signal-to-noise ratio, superior dynamic range and immunity to process variation and component ageing.Two on-board Operational Amplifiers convert the digital-to-analog current to an output voltage. Externally connected capacitors perform the required 1st order filtering so that no further post filtering is required. The unique combination of bitstream and continuous calibration techniques, together with a high degree of Analog and digital integration, results in a single filter-DAC with 18-bit dynamic range, high linearity and simple low cost application.
By NXP Semiconductors