TDA7382 Datasheet, PDF (7/10 Pages) STMicroelectronics – 4 x 22W FOUR BRIDGE CHANNELS CAR RADIO AMPLIFIER

Figure 9: Output Noise vs. Source Resistance
TDA7382
Figure 10: Power Dissipation & Efficiency vs.
Output Power
P_tot (W)
P_tot
R_g (Ω)
INPUT STAGE
The TDA7382’S inputs are ground-compatible
and can stand very high input signals (± 8Vpk)
without any performances degradation.
If the standard value for the input capacitors
(0.1µF) is adopted, the low frequency cut-off will
amount to 16 Hz.
STAND-BY AND MUTING
STAND-BY and MUTING facilities are both
CMOS-COMPATIBLE. If unused, a straight con-
nection to Vs of their respective pins would be ad-
missible. Conventional low-power transistors can
be employed to drive muting and stand-by pins in
Figure 11: Input/OutputBiasing.
100KΩ
0.1µF
C1 ÷ C4
IN
absence of true CMOS ports or microprocessors.
R-C cells have always to be used in order to
smooth down the transitions for preventing any
audible transient noises.
Since a DC current of about 10 uA normally flows
out of pin 22, the maximum allowable muting-se-
ries resistance (R2) is 70KΩ, which is sufficiently
high to permit a muting capacitor reasonably
small (about 1µF).
If R2 is higher than recommended, the involved
risk will be that the voltage at pin 22 may rise to
above the 1.5 V threshold voltage and the device
will consequently fail to turn OFF when the mute
line is brought down.
About the stand-by, the time constant to be as-
+
-
8KΩ
400Ω
V_S
10KΩ
70KΩ _SVR
10KΩ
100KΩ
47µF
C6
400Ω
8KΩ
-
AC_GND ₊
0.1µF
C5
D95AU302
TOWARDS
OTHER CHANNELS
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