TDA1306T/N2 Просмотр технического описания (PDF) - Philips Electronics

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TDA1306T/N2

Noise shaping filter DAC

Philips Electronics 

Philips Semiconductors

Noise shaping filter DAC

Product specification

TDA1306T

VOLUME CONTROL (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 of

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 logic 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

(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 microcontroller application mode). An

example of volume control in this application mode is

illustrated in Fig.6.

(1) INCR and DECR in repeat mode.

Fig.6 Volume control (microcontroller application mode).

1998 Jan 06

10

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