la4815vh Sanyo Semiconductor Corporation, la4815vh Datasheet - Page 7
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la4815vh
Manufacturer Part Number
la4815vh
Description
Monaural Power Amplifier
Manufacturer
Sanyo Semiconductor Corporation
Datasheet
1.LA4815VH.pdf
(15 pages)
3. Mute control pin (Pin 3)
4. Mute control timing
The internal power amplifier circuit can be disabled and audio mute is turned on by controlling the voltage applied to
Pin 3. Control can be performed directly using the CPU output port, but digital noise from the CPU may worsen the
LA4815VH noise floor. Therefore, inserting a series resistor, Rm1 (1 to 2.2kΩ) as shown in Fig. 6, is recommended.
In addition, the Pin 3 DC voltage is dependent on the supply voltage, so a reverse current flows to the CPU power
supply line when the Pin 3 voltage is higher than the CPU supply voltage. In these cases, connect a resistor, Rm2 (see
Fig. 7) between Pin 3 and GND to lower the Pin 3 DC voltage as shown in Fig. 6.
Note that when not using the mute function, Pin 3 must be left open.
Reverse current prevention resistor value : Rm2 (reference value) ← When V3 is set to approximately 2.5V
When performing mute control, exercise control at the timing shown in Fig. 8.
• Mute ON : Low
• Mute OFF : High or open
During power-on : Twu = 0 to 50ms
During power-off : Twd = 100 to 200ms
* Pins 2 and 3 can also rise simultaneously.
V DD
V SS
CPU
(MUTE)
(V CC )
Pin 2
Pin 3
* For reverse
current prevention
1000
100
Rm1
1kΩ
10
7
5
3
2
7
5
3
2
6
8
Rm2
Twu
LA4815VH
Supply voltage, V CC – V
10
3
LA4815VH
Figure 6
Rm2 – V CC
Figure 7
Figure 8
12
10kΩ
30kΩ
14
40kΩ
30kΩ
16
Twd
18
20
V CC
GND
No.A1374-7/15