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SLOS162D – MARCH 1997 – REVISED FEBRUARY 2007
APPLICATION INFORMATION (continued)
is a reference schematic that provides TTL-level control of the M/SB terminal. A diode network is also
included which helps reduce turn-on pop noises. The diodes serve to drain the charge out of the output coupling
capacitors while the amplifier is in shutdown mode. When the M/SB voltage is in the normal operating range, the
diodes have no effect on the ac performance of the system.
V
CC
C
IR
Right
1
µF
1
IN1
60 k
+
–
+
–
+
×
1
OUT1 4
C
OR
470
µF
7
C
S
V
CC
1
µF
1N914
2.1 V
ref
220
Ω
18 kΩ
2
5
S1
See
Note A
V
CC
Ref
SGND
PGND
15 kΩ
V
CC
2 kΩ
Mute
Standby
3 SVRR
C
B
2.2
µF
15 kΩ
×
1
M/SB 8
Q1
10 kΩ
10 kΩ
47 kΩ
Q2
1N914
S2
See
Note B
47 kΩ
47 kΩ
2 kΩ
TTL Control
Low – Mute
High – On
18 kΩ
2.1 V
ref
6.8 kΩ
10 kΩ
C
OL
60 k
C
IL
Left
1
µF
9 IN2
–
+
+
–
+
×
1
OUT2 6
470
µF
GND/HS
10 – 20
Copper Plane
A.
B.
C.
When S1 is closed, the depop circuitry is active during standby mode.
When S2 is open, activating S1 places the TPA1517 in mute mode. When S2 is closed, activating S1 places the
TPA1517 in standby mode.
The terminal numbers are for the 20-pin NE package.
Figure 25. TTL Control with POP Reduction
13
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