TDA1386T Philips Semiconductors, TDA1386T Datasheet - Page 9

• Manufacturer Part Number: TDA1386T
• Description: Noise shaping filter DAC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
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
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/f
is approximately 3 ms.
1998 Jan 06
Noise shaping filter DAC
s
. For example, when f
maximum level/120.
s
= 44.1 kHz, the time taken
Fig.5 Volume control; pseudo-static application mode.
9
V
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.
OLUME CONTROL IN PSEUDO
-
STATIC APPLICATION MODE
Product specification
TDA1386T