DescriptionThe TC9434AFN is second-order - modulation system 1 bit DA converters incorporating an 8-times oversampling digital filter, an analog filter and digital bass boost function developed for digital audio equipment.Because the TC9434AFN IC includes an analog filter, it can output a direct analog waveform, thus reducing the size and cost of the DA converter.
Features of the TC9434AFN are:(1)built-in 8-times oversampling digital filter; (2)low-voltage operations (2.7V) possible; (3)built-in digital de-emphasis filter; (4)in serial control mode, output amplitude can be set in 128 steps of resolution using microcontroller commands; (5)in parallel control mode, soft mute can be set for the output signal in 64 steps in 20ms; (6)built-in LR common digital zero detection output circuit; (7)DAC converter oversampling ratio (OSR):192fs; (8)two types of built-in digital bass boost function; (9)sampling frequency:44.1 kHz; (10)built-in third-order analog filter; (11)the digital filter and DA converter characteristics are shown on the next page.
The absolute maximum ratings of the TC9434AFN 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.DATA and the LRCK are loaded to the LSI internal shift registers on the BCK signal rising edge.It is consequently necessary for the DATA and LRCK signals to be synchronized and input on the BCK signal falling edge as indicated in the timing example below. Also, as DATA has been designed so that the 16 bits before the change point of LRCK are regarded as valid data, the data must be input afterwards when the BCK is 48fs or 64fs, etc.IC will also operate when a system clock is input from an external source through the XI pin(pin 15). However, in this situation, due consideration must be given to the fact that waveform characteristics, such as fitter and rising/falling characteristics of the system clock, significantly affect the DA converter's noise distortion and the S/N ratio.
TC9434AFN Data Sheet
