la4800v Sanyo Semiconductor Corporation, la4800v Datasheet - Page 6

• Manufacturer Part Number: la4800v
• Description: 3 V Stereo Headphone Power Amplifier
• Manufacturer: Sanyo Semiconductor Corporation

External Components Description
Operating Notes
Beep tone operating principle
The design of the above when mute is ON (pin 16 open) is as follows:
The output voltage V
V
For example, if R
V
The beep tone output voltage V
connected to the PWR output and hence these RC components will also influence the actual value of V
tone, the impedance of C10, connected to the common output (pin 13), must be greater than the impedance of C9 and C11, i.e.
C10 must be greater than C9 and C11.
O
O
C9, C10, C11
Components
=
=
R3, R4, R5
C1, C2
C3, C4
C5, C4
R1, R2
16
C12
R
C6
C8
R6
L
+ 3k+ 1k
R
+ 3k+ 1k
16
L
Signal from microcontroller
L
= 16
O
as function of R
Recommended value
V
A
0.5
0.22 to 0.47 µF
and V
3.3 to 10 µF
4.7 to 10 µF
0.1 to 1.0µF
0.5 to 4.3
1 to 4.7 µF
0.1 to 1 µF
220 µF
100 k
O
2 mV
A
is determined by the above equation. However, the oscillation damping RC components are
= 0.5 V (V
L
is
A
Input coupling capacitors
Reference bias (V
Ripple filter capacitors. Increasing the capacitance also increases the distortion and
the supply rise time at turn ON.
Input coupling capacitor for the beep tone. Choose a value that does not attenuate the
beep tone signal.
Supply line coupling capacitor
Oscillation damping capacitors. Film capacitors are recommended.
Mute time setting capacitor. See the description in the Operating Notes.
Beep tone input signal adjustment resistors. Follow the manufactures instructions.
Power amplifier oscillation damping resistors.
Mute OFF pin 16 bias setting resistor. The internal 300 k
resistor together set the mute switch (pin 16) threshold.
is the adjusted input voltage on pin 9),
LA4800V
REF
) decoupling capacitors
Description
Unit (resistance:
O
. When using the beep
resistor and this 100 k
, capacitance: F)
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