參數(shù)資料
型號(hào)： TEA6324T-T
廠商： NXP SEMICONDUCTORS
元件分類： 音頻／視頻放大
英文描述： 2 CHANNEL, AUDIO PREAMPLIFIER, PDSO24
文件頁(yè)數(shù)： 20/36頁(yè)
文件大?。?/td> 164K
代理商： TEA6324T-T
1997 Mar 13
27
Philips Semiconductors
Preliminary specication
Sound control circuit
TEA6324T
Selection of input signals by using the zero crossing
mute mode
The zero cross mute mode provides for a selection of input
sources (A and B) for both left and right channels.
The following example (see Fig.15), shows a typical
selection for the left input source signals IAL and IBL.
The initial selection of these channels produces a
modulation click. The click is determined by the difference
of the signal values at the time of switching.
At t1 the maximum possible difference between signals is
7 V (p-p) (see Fig.15) and gives a large click. Using the
cross detector no modulation click is audible.
With the selection enabled at t1, the microcontroller sets
the zero cross bit (ZCM = 1) and then the mute bit
(GMU = 1) via the I2C-bus. The output signal follows the
input A signal from
4 V, until the next zero crossing
occurs and then activates mute.
After a fixed delay time at t2, the microcontroller sends the
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 up to 3 V.
With a delay time of 40 ms (t2 t1), the external capacitor
Cm = 3.3 nF. This results with the zero cross function
operating at the lowest frequency of 40 Hz determined by
the Cm capacitor.
Fig.15 Zero cross function; only one channel shown.
handbook, full pagewidth
V
t
t1
4
0
1
2
3
4
1
2
3
t2
MED436
(1)
(2)
(3)
(1) Input A (IAL).
(2) Output.
(3) Input B (IBL).
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