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AN7124 Datasheet(PDF) 4 Page - Panasonic Semiconductor

Part No. AN7124
Description  Dual 3.1 W Audio Power Amplifier
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Maker  PANASONIC [Panasonic Semiconductor]
Homepage  http://www.panasonic.com/industrial/
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 4 page
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4
AN7124
ICs for Audio Common Use
s Application Note
1.Voltage gain
The close loop gain of AN7124 is fixed at 45 dB(typ.)
GV = 20 log(
R1
)
R2
2.Standby function
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
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.
Threshold voltage (at Pin1) :
ON
<2.8 V<OFF
Impedance, ZSTBY ≈ 1 kHz
3.Muting
By controlling Pin2 from "H" to "L", the mute function is set from ON to OFF. When Pin2 is floating, DC
≈ 0.02
V. The threshold is set
≈ 2.8 V. The RC is to create a TIME CONSTANT for the mute pulse during charging and
discharging.
Threshold voltage (at Pin2) :
10 % mute
= 1.5 V
90 % mute
= 2.8 V
Impedance, ZMUTE ∞ 45 kΩ
15 k
84
R1
R2
R
C
1
Stb
Off
On
ZSTBY
VCC
Q1
I
5 V
R
C
2
Bias
Mute
Off
On
ZMUTE
5 V




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