TC9438FN

The TC9438FN is a second-order 2-A 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 IC includes an analog filter, TC9438FN can output a direct analog waveform, thus reducing the size and cost of the DA converter.

The features of TC9438FN can be summarized as (1)built-in 8-times oversampling digital filter; (2)low-voltage operations possible; (3)built-in digital de-emphasis filter; (4)built-in dynamic digital bass boost function; (5)in serial control mode, output amplitude can be set in 128 steps of resolution using microcontrolle commands; (6)in parallel control mode, soft mute can be set for the output signal in 64 steps in 20ms; (7)built-in LR common digital zero detection output circuit; (8)sampling frequency : 44.1kHz; (9)supports 384fs/256fs (automatic switching); (10)DA converter oversampling ratio (OSR) : 19Zfs (at 384fs); (11)stereo/monaural output selection possible; (12)built-in third-order analog filter; (13)the digital filter and DA converter characteristics are shown on the next page.

The absolute maximum ratings of TC9438FN are (1)power supply voltage VDD: -0.3~6.0V, VDA: -0.3~6.0V, VDX: -0.3~6.0V; (2)input voltage Vin: -0.3~VDD +0.3V; (3)power dissipation PD: 200 mW; (4)operating temperature Topr: -35~85°C; (5)storage temperature Tag: - 55~150°C.