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LA4815VH Datasheet(PDF) 7 Page - Sanyo Semicon Device |
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LA4815VH Datasheet(HTML) 7 Page - Sanyo Semicon Device |
7 / 15 page LA4815VH No.A1374-7/15 3. Mute control pin (Pin 3) 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 2.2k Ω) as shown in Fig. 6, is recommended. • Mute ON : Low • Mute OFF : High or open 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. Figure 6 Reverse current prevention resistor value : Rm2 (reference value) ← When V3 is set to approximately 2.5V Figure 7 4. Mute control timing When performing mute control, exercise control at the timing shown in Fig. 8. During power-on : Twu = 0 to 50ms * Pins 2 and 3 can also rise simultaneously. During power-off : Twd = 100 to 200ms Figure 8 Pin 2 (VCC) Pin 3 (MUTE) Twd Twu Rm2 – VCC 10 100 7 5 3 2 7 5 3 2 1000 610 12 14 16 18 820 Supply voltage, VCC –V Rm1 Rm2 VDD VSS CPU LA4815VH GND VCC 3 * For reverse current prevention |
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