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TDA7266 Datenblatt(PDF) 3 Page - STMicroelectronics

Teilenummer TDA7266
Bauteilbeschribung  7W7W DUAL BRIDGE AMPLIFIER
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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TDA7266SA
APPLICATION SUGGESTION
STAND-BY AND MUTE FUNCTIONS
(A) Microprocessor Application
In order to avoid annoying "Pop-Noise" during Turn-On/Off transients, it is necessary to guarantee the right St-
by and mute signals sequence. It is quite simple to obtain this function using a microprocessor (Fig. 1 and 2).
At first St-by signal (from
µP) goes high and the voltage across the St-by terminal (Pin 7) starts to increase ex-
ponentially. The external RC network is intended to turn-on slowly the biasing circuits of the amplifier, this to
avoid "POP" and "CLICK" on the outputs.
When this voltage reaches the St-by threshold level, the amplifier is switched-on and the external capacitors in
series to the input terminals (C3, C53) 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.
Figure 1. Microprocessor Application
Ri
Input Resistance
25
30
K
VTMUTE
Mute Threshold
for VCC > 6.4V; Vo = -30dB
2.3
2.9
4.1
V
for VCC < 6.4V; Vo = -30dB
VCC/2
-1
VCC/2
-075
VCC/2
-0.5
V
VTST-BY
St-by Threshold
0.8
1.3
1.8
V
IST-BY
St-by Current V6 = GND
100
µA
eN
Total Output Voltage
A Curve; f = 20Hzto 20KHz
150
µV
ELECTRICAL CHARACTERISTCS (continued)
(VCC = 11V, RL = 8Ω, f = 1KHz, Tamb = 25°C unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
1
2
4
Vref
ST-BY
7
IN1
C1 0.22
µF
VCC
13
3
D95AU258A
+
-
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C3 0.22
µF
+
-
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C5
470
µF
C6
100nF
R1 10K
C2
10
µF
µP
R2 10K
C4
1
µF


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