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參數(shù)資料
| 型號： | TDA7297SA |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封裝： | CLIPWATT-15 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 571K |
| 代理商： | TDA7297SA |
3/11
TDA7297SA
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
P) 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, 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.
Figure 1. Microprocessor Application
Ri
Input Resistance
25
30
K
VTMUTE
Mute Threshold
Vo = -30dB
2.3
2.9
4.1
V
VTST-BY
St-by Threshold
0.8
1.3
1.8
V
IST-BY
St-by Current V6 = GND
100
A
eN
Total Output Voltage
A Curve;
f = 20Hz to 20KHz
150
220
500
V
ELECTRICAL CHARACTERISTCS (continued)
(VCC = 13V, RL = 8, 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
F
VCC
13
3
D95AU258A
+
-
+
OUT1+
OUT1-
15
14
12
MUTE
6
IN2
C3 0.22
F
+
-
+
OUT2+
OUT2-
8
9
S-GND
PW-GND
C5
470
F
C6
100nF
R1 10K
C2
10
F
P
R2 10K
C4
1
F
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