TB2905HQ 查看數據表（PDF） - Toshiba
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TB2905HQ Datasheet PDF : 17 Pages
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TB2905HQ
5. Output Clipping Detection Function (Pin 25)
Pin 25 has open-collector output (active low) structure, as shown in Figure 7.
If the output waveform is clipped, the clipping detection circuit in the IC activates and turns the Q1 NPN
transistor on.
The microcontroller can use this signal to control the volume and tone control circuits, thus improving
sound quality.
Pin 25 should be left open when this function is not used.
(Example application)
5V
Q1 25
Output clipping
detector
L.P.F.
smoothing
circuit
Volume control circuit
Tone control circuit
Pin 25: Open-collector output (active low)
(A) Output AC waveform
AC
(A)
DC
(B) Clipping detection circuit
(B)
Clipped level
t
Clipped level
t
(C) Clipping detection pin
(output of pin 25)
DC
(C)
5V
GND
t
Figure 8 Clipping detection mechanism
6
2005-08-17
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