TC9279F

The TC9279F is a second-order - modulation system 1-bit DA converter incorporating an 8-times oversampling digital filter, dynamic digital bass boost function for use with compressor operations and an analog filter developed for digital audio equipment.Because the TC9279F IC is small package (SOP20, DIP20) and includes the digital de-emphasis filter, it is possible to constitute reducing the size and cost of the DA converter.

Features of the TC9279F are:(1)built-in 8-times oversampling digital filter; (2)low voltage operations (3.3 V) possible; (3)built-in digital de-emphasis filter; (4)DA converter oversampling ratio (OSR) is 192 fs; (5)sampling frequency:32 kHz, 48 kHz.The information contained herein is presented only as a guide for the applications of our products.No  responsibility  is assumed  by TOSHIBA  CORPORATION  for  any  infringements of intellectual property or other rights of the third  parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others.

The absolute maximum ratings of the TC9279F can be summarized as:(1)supply voltage:-0.3 to 6.0 V;(2)input voltage:-0.3 to Vdd+0.3V;(3)storage temperature:-55 to 150;(4)operating temperature:-35 to 85;(5)power dissipation:200mW.The de-emphasis ON/OFF is controlled by EMP pin, and fs selection is controlled by FS pin.Digitization of the de-emphasis filter has eliminated the necessity for external parts such as resistor,capacitor, analog switch, etc.Further, to reduce the characteristic error of the de-emphasis filter, coefficients have been adjusted.The construction and characteristics of the de-emphasis filter are shown below.The digitalization of the de-emphasis filter eliminates the need for such external components as resistors, condensers and analog switches. In addition to this, the coefficients are aligned to reduce error in the de-emphasis filter characteristics.In this circuit, output data waveform is shaped, and forward and reverse signals of bit stream data are output to the outside through a buffer.By differentiating these forward signal and the reverse signal in the external analog circuit, DA conversion output of low distortion and high S/N ratio can be obtained.