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参数资料
| 型号： | LC75412WS |
| 元件分类： | 音频控制 |
| 英文描述： | VOLUME CONTROL CIRCUIT, PQFP64 |
| 封装： | 10 X 10 MM, SQFP-64 |
| 文件页数： | 9/19页 |
| 文件大小： | 179K |
| 代理商： | LC75412WS |
LC75412WS
No.A1354-17/19
Usage Cautions
(1) Data transmission at power ON
The status of internal analog switches is unstable at power ON. Therefore, perform muting or some other
countermeasure until the data has been set.
(2) Description of zero-cross switching circuit operation
The LC75412WS have a function to switch zero-cross comparator signal detection locations, enabling the selection
of the optimum detection location for blocks whose data is to be updated. Basically, the switching noise can be
minimized by inputting the signal immediately following the block whose data is to be updated to the zero-cross
comparator, so it is necessary to switch the detection location every time.
LC75412WS Zero-Cross Detection Circuit
(3) Zero-cross switching control method
The zero-cross switching control method consists of setting the zero-cross control bits to the zero-cross detection
mode (D36, D37 = 0), and specifying the detection blocks (D38, D39) before transmitting the data. These control
bits are latched immediately following data transfer, that is to say beforehand in sync with the falling edge of CE, so
when updating data of volumes, etc., it is possible to perform mode setting and zero-cross switching with one data
transfer. An example of control when updating the data of the volume block is shown below.
D36
D37
D38
D39
0
1
0
(4) Zero-cross timer setting
If the input signal becomes lower than the zero-cross comparator detection sensitivity, or if only low-frequency
signals are input, zero-cross detection continues to be impossible, and data is not latched during this time.
The zero-cross timer can set a time for forcible latch during such a status when zero-cross detection is not possible.
For example, to set 25ms, using T = 0.69CR and C = 0.033
μF, we obtain
R=
≈1.1MΩ
Normally, a value between 10ms and 50ms is set.
Volume
Tone
Switch
Fader
Zero-cross
comparator
Selector
Volume block
setting
Zero-cross detection
mode setting
25×10-3
0.69×0.033×10-6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LC75412WS-UF-E | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| LC75421 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Electronic Volume Controller for Cars |
| LC75421M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Electronic Volume Controller for Cars |
| LC75421M-MPB-E | 制造商:ON Semiconductor 功能描述:ELECTRONIC VOLUME - Ammo Pack |
| LC75421M-TLM-E | 制造商:ON Semiconductor 功能描述:ELECTRONIC VOLUME - Tape and Reel |
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