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參數資料
| 型號： | LC75412E |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數： | 11/21頁 |
| 文件大小： | 204K |
| 代理商： | LC75412E |
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 LC75412E and 75412W 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.
LC75412E, 75412W Zero-Cross Detection Circuit
No. 7053-19/21
LC75412E, 75412W
Volume
Tone
Switch
Fader
Zero-cross
comparator
Selector
(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.
Zero-cross detection
mode setting
Volume block
setting
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 25 ms,
using T = 0.69CR and C = 0.033 F,
we obtain
Normally, a value between 10 ms and 50 ms is set.
R=
1.1 M
25
× 10–3
0.69
× 0.033 × 10 –6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LC75412EH-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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 |
| LC75412W | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Electronic Volume Controller for Car Audio Systems |
| LC75412WH-D-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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 |
| LC75412WH-E | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產品: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 |
| LC75412WS | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Electronic Volume Controller for Car Audio Systems |
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