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9 / 24 page 1998 Jan 06 9 Philips Semiconductors Product specification Noise shaping filter DAC TDA1386T Volume control A digital level control is incorporated on the TDA1386T which performs the function of soft mute and attenuation (pseudo-static application mode) or soft mute, attenuation, fade, increment and decrement (microcontroller application mode). The volume control of both channels can be varied in small step changes, determined by the value of the internal fade counter according to: Audio level = counter × maximum level/120. Where the counter is a 7-bit binary number between 0 and 120. The time taken for mute to vary from 120 to 0 is 120/fs. For example, when fs = 44.1 kHz, the time taken is approximately 3 ms. VOLUME CONTROL IN PSEUDO-STATIC APPLICATION MODE In the pseudo-static application mode (APPL = logic 0) the digital audio output level is controlled by APP0 (attenuation) and APP2 (mute) so only the final volume levels full scale, 12 dB (attenuate) and mute ( −infin dB) can be selected. The mute function has priority over the attenuation function. Accordingly, if MUSB is LOW, the state of ATSB has no effect. An example of volume control in this application mode is illustrated in Fig.5. Fig.5 Volume control; pseudo-static application mode. |
Số phần tương tự - TDA1386T |
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Mô tả tương tự - TDA1386T |
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