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參數(shù)資料
| 型號： | LA4815M |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.62 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | 0.225 INCH, MFP-8 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 233K |
| 代理商： | LA4815M |
LA4815M
3. Mute control pin (Pin 7)
The internal power amplifier circuit can be disabled and audio mute is turned on by controlling the voltage applied to
Pin 7. Control can be performed directly using the CPU output port, but digital noise from the CPU may worsen the
LA4815M 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 7 DC voltage is dependent on the supply voltage, so a reverse current flows to the CPU power
supply line when the Pin 7 voltage is higher than the CPU supply voltage. In these cases, connect a resistor, Rm2 (see
Fig. 7) between Pin 7 and GND to lower the Pin 7 DC voltage as shown in Fig. 6.
Note that when not using the mute function, Pin 7 must be left open.
Rm1
* For reverse
current prevention
1k
Ω
Rm2
VDD
VSS
CPU
I/O
port
LA4815M
GND
VCC
30k
Ω
30k
Ω
40k
Ω
10k
Ω
7
Figure 6
Reverse current prevention resistor value : Rm2 (reference value)
← When V7 is set to approximately 2.5V
Rm2 – VCC
10
100
7
5
3
2
7
5
3
2
1000
711
13
91
Supply voltage, VCC –V
Impedance,
Rm2
–
kΩ
5
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 6 and 7 can also rise simultaneously.
During power-off : Twd = 100 to 200ms
Pin 6
(VCC)
Pin 7
(MUTE)
Twd
Twu
Figure 8
No.A1373-7/14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA4815M_10 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815M-TLM-H | 功能描述:功率放大器 MONAURAL POWER AMPLIFIER RoHS:否 制造商:TriQuint Semiconductor 封裝 / 箱體: 工作電源電壓:28 V 電源電流:2.5 A 工作溫度范圍: 封裝: |
| LA4815VH | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH_12 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monaural Power Amplifier |
| LA4815VH-MPB-H | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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