an7124 Panasonic Corporation of North America, an7124 Datasheet - Page 4

• Manufacturer Part Number: an7124
• Description: Dual 3.1 W Audio Power Amplifier
• Manufacturer: Panasonic Corporation of North America

AN7124
4
1.Voltage gain
2.Standby function
3.Muting
provide a constant current (I) for driving other parts of the circuit. The RC is to create a TIME CONSTANT for the
standby pulse during charging and discharging.
V. The threshold is set
discharging.
The close loop gain of AN7124 is fixed at 45 dB(typ.)
Standby is ON when Pin1 is set to "L". By applying a 5 V to the standby pin, transistor Q1 will be turned ON to
By controlling Pin2 from "H" to "L", the mute function is set from ON to OFF. When Pin2 is floating, DC
Application Note
Off
Off
5 V
5 V
On
On
Mute
2.8 V. The RC is to create a TIME CONSTANT for the mute pulse during charging and
Stb
R
R
2
R
C
C
84
Z
Z
MUTE
STBY
15 k
R
1
2
1
Bias
G
V
Q
V
CC
ICs for Audio Common Use
1
I
20 log(
Threshold voltage (at Pin1) :
ON 2.8 V OFF
Impedance, Z
Threshold voltage (at Pin2) :
10 % mute
90 % mute
Impedance, Z
R
R
1
2
)
1.5 V
2.8 V
STBY
MUTE
1 kHz
45 k
0.02