TDA7265
APPLICATIONS SUGGESTION
(Demo Board Schematic)
The recommended values of the external compo-
COMPONENTS
R1
R2
R3
R4
R5, R8
R6, R9
R7, R10
C1, C2
C3
C4, C6
C5, C7
C8, C9
Dz
Q1
RECOMMENDED
VALUE
10K
Ω
15KΩ
18KΩ
15KΩ
18KΩ
560Ω
4.7Ω
1µF
1µF
1000
µ
F
0.1µF
0.1
µ
F
5.1V
BC107
PURPOSE
Mute Circuit
Mute Circuit
Mute Circuit
Mute Circuit
Closed Loop Gain
Setting (*)
Frequency Stability
Input DC
Decoupling
St-By/Mute Time
Constant
Supply Voltage
Bypass
Supply Voltage
Bypass
Frequency Stability
Mute Circuit
Mute Circuit
Larger On/Off Time
nents are those shown are the demo board sche-
matic different values can be used: the following
table can help the designer.
LARGER THAN
RECOMMENDED VALUE
Increase of Dz
Biasing Current
V
pin
# 5 Shifted Downward
V
pin
# 5 Shifted Upward
V
pin
# 5 Shifted Upward
Increase of Gain
Decrease of Gain
Danger of Oscillations
Danger of Oscillations
Higher Low Frequency
Cutoff
Smaller On/Off Time
Danger of Oscillations
Danger of Oscillations
V
pin
# 5 Shifted Upward
V
pin
# 5 Shifted Downward
V
pin
# 5 Shifted Downward
SMALLER THAN
RECOMMENDED VALUE
(*) Closed loop gain has to be => 25dB
MUTE, STAND-BY TRUTH TABLE
SW1
B
B
A
A
SW2
A
B
A
B
STAND-BY
STAND-BY
MUTE
PLAY
8/11
STMICROELECTRONICS [ STMICROELECTRONICS ]
