TEA6320T Philips Semiconductors (Acquired by NXP), TEA6320T Datasheet - Page 28

• Manufacturer Part Number: TEA6320T
• Description: TEA6320; Sound Fader Control Circuit;; Package: SOT287-1 (SO32)
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
Selection of input signals by using the zero crossing
mute mode
A selection from input A (IAL) to input B (IBL) left sources
produces a modulation click depending on the difference
of the signal values at the time of switching.
At t
7 V(p-p) (see Fig. 16) and gives a large click. Using the
cross detector no modulation click is audible.
For example: The selection is enabled at t
microcontroller sets the zero cross bit (ZCM = 1) and then
the mute bit (GMU = 1) via the I
1995 Dec 19
handbook, full pagewidth
Sound fader control circuit
1
(1) Input A (IAL).
(2) Output.
(3) Input B (IBL).
the maximum possible difference between signals is
V
4
3
2
1
0
1
2
3
4
2
C-bus. The output signal
Fig.16 Zero cross function; only one channel shown.
1
t 1
, the
28
follows the input A signal, until the next zero crossing
occurs and then activates mute.
After a fixed delay time at t
bits for input switching and mute inactive.
The output signal remains muted until the next signal zero
crossing of input B (IBL) occurs, and then follows that
signal.
The delay time t
C
lowest frequency of 40 Hz determined by the C
m
= 3.3 nF. The zero cross function is working at the
t 2
(1)
(2)
(3)
2
t
1
is e.g. 40 ms. Therefore the capacity
2
, the microcontroller sends the
MED436
Preliminary specification
t
TEA6320
m
capacitor.