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TDA1386T Folha de dados(PDF) 10 Page - NXP Semiconductors |
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TDA1386T Folha de dados(HTML) 10 Page - NXP Semiconductors |
10 / 24 page 1998 Jan 06 10 Philips Semiconductors Product specification Noise shaping filter DAC TDA1386T VOLUME CONTROL IN MICROCONTROLLER APPLICATION MODE In the microcontroller application mode (APPL = logic 1, APP3 = logic 0) the audio output level is controlled by volume control bits ATSB, MUSB, FS, INCR and DECR. Mute is activated by sending the MUSB command to the mode control register via the microcontroller interface. The audio output level will be reduced to zero in a maximum 120 steps (depending on the current position of the fade counter) and taking a maximum of 3 ms. Mute, attenuation and full scale are synchronized to prevent operation in the middle of a word. • The counter is preset to 120 by the full scale command. • The counter is preset to 30 by the attenuate command when its value is more then 30. If the value of the counter is less than 30 dB the ATSB command has no effect. • The counter is preset to 0 by the mute command MUSB. • Attenuation (−12 dB) is activated by sending the ATSB command to the fade control register (D7). • Attenuation and mute are cancelled by sending the full scale command to the fade control register (D3). To control the fade counter in a continuous way, the INCREMENT and DECREMENT commands are available (fade control registers D1 and D2). They will increment and decrement the counter by 1 for each register write operation. When issuing more than 1 step-up or step-down command in sequence, the write repeat mode may be used (see microprocessor application mode). An example of volume control in this application mode is illustrated in Fig.6. Fig.6 Volume control; microcontroller application mode. (1) INCR and DECR in repeat mode. |
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