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TDA1388T Datenblatt(PDF) 11 Page - NXP Semiconductors |
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TDA1388T Datenblatt(HTML) 11 Page - NXP Semiconductors |
11 / 24 page 1996 Jul 17 11 Philips Semiconductors Objective specification Bitstream continuous calibration filter-DAC for CD-ROM audio applications TDA1388 TREBLE: a 5-bit value to program the treble setting. The used set depends on the MODE bits. Table 14 Treble settings TR4 TR3 TR2 TR1 TR0 TREBLE FLAT SET (dB) MIN SET (dB) MAX SET (dB) 00000 0 0 0 00001 0 0 0 00010 0 2 2 00011 0 2 2 00100 0 4 4 00101 0 4 4 00111 0 6 6 00110 0 6 6 01001 0 6 6 01000 0 6 6 01011 0 6 6 01010 0 6 6 01101 0 6 6 01100 0 6 6 01111 0 6 6 01110 0 6 6 ::::: : : : 11110 0 6 6 Flat/min/max setting selection In the TDA1388 has three setting for the digital sound features bass boost and treble. The possible settings are called ‘flat’, ‘min’ and ‘max’. The flat setting has no influence on the audio signal, the minimum setting has a small influence on the audio signal and the maximum setting has a large influence on the audio signal. In the static-pin mode, the flat setting is used for the bass boost and treble filters. In the microcontroller mode, all three settings can by controlled by a register. Channel manipulation modes In the TDA1388 there is a channel manipulation function implemented. This function has a fixed value in the static-pin mode, the left signal on the left channel and the right signal on the right channel. In the microcontroller mode several option are possible. The different modes are as follows: • Normal stereo output • Left/right reverse output • Mono left/right output: 1⁄ 2(L+R) • Output muting with soft mute. De-emphasis De-emphasis is controlled by an external pin in the static-pin mode and by a register in the microcontroller mode.The digital de-emphasis filter is dimensioned to produce the de-emphasis frequency characteristics for the sample rate 44.1 kHz. With its 18-bit dynamic range, the digital de-emphasis filter of the TDA1388 is a convenient and component saving alternative to analog de-emphasis. De-emphasis is synchronized to the sample clock, so that operation always takes place on complete samples. |
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