TDA1306T/N2 查看數據表（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

A digital level control is incorporated in the TDA1306T

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 where:

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

1/120fs. For example, when fs = 44.1 kHz, the time taken

is approximately 3 ms.

VOLUME CONTROL (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 (−infinity 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).

1998 Jan 06

9

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