TDA7266S Datasheet, PDF (3/8 Pages) STMicroelectronics – 5+5W DUAL BRIDGE AMPLIFIER

ELECTRICAL CHARACTERISTICS (Continued)
Symbol
VT_ST-BY
I_ST-BY
e_N
Parameter
St-by Threshold
ST-BY current V6 = GND
Total Output Noise Voltage
Test Condition
A curve
f = 20Hz to 20kHz
TDA7266S
Min. Typ. Max. Unit
0.8
1.3
1.8
V
100
µA
150
µV
APPLICATION SUGGESTION
the amplifier, this to avoid "POP" and "CLICK" on
the outputs.
STAND-BY AND MUTE FUNCTIONS
When this voltage reaches the St-by threshold
(A) Microprocessor Application
In order to avoid annoying "Pop-Noise" during
) Turn-On/Off transients, it is necessary to guaran-
t(s ^{tee the right St-by and mute signals sequence.}
It is quite simple to obtain this function using a mi-
c _{croprocessor (Fig. 1 and 2).}
du ^{At first St-by signal (from mP) goes high and the}
ro ^{voltage across the St-by terminal (Pin 7) starts to}
) _{increase exponentially. The external RC network}
te ^{P t(s is intended to turn-on slowly the biasing circuits of}
c _{Figure 1: Microprocessor Application}
level, the amplifier is switched-on and the external
capacitors in series to the input terminals (C3,
C5) start to charge.
It’s necessary to mantain the mute signal low until
the capacitors are fully charged, this to avoid that
the device goes in play mode causing a loud "Pop
Noise" on the speakers.
A delay of 100-200ms between St-by and mute
signals is suitable for a proper operation.
- ^{Obsole te Produ C1 0.22µF}
) ^{le 4}
IN1
ct(s bso ST-BY R1 10K
7
du ^{- O C2}
ro ^{) 10µF}
VCC
3
13
C5
470µF
+
1 OUT1+
-
C6
100nF
te ^{P uct(s} _µP
S-GND
9
bsole ^{ProdC3 0.22µF}
O ^te IN2
Vref
12
ole _{MUTE R2 10K}
s₆
Ob ^C4
-
2 OUT1-
+
+
15 OUT2+
-
1µF
PW-GND
8
-
14 OUT2-
+
D95AU258A
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