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參數(shù)資料
| 型號(hào)： | LA7578N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs(用于電視機(jī)/VCR應(yīng)用的IF信號(hào)處理（超鎖相環(huán)II VIF+SIF）電路) |
| 中文描述： | 中頻信號(hào)處理（超鎖相環(huán)-Ⅱ資料表格應(yīng)力強(qiáng)度因子）的電視和錄像機(jī)電路（用于電視機(jī)/錄像機(jī)應(yīng)用的中頻信號(hào)處理（超鎖相環(huán)二資料表格強(qiáng)度因子）電路） |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大小： | 237K |
| 代理商： | LA7578N |
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Design Materials
Fig. 5
Fig. 6 De-emphasis
0.01μF
Fig. 7
Pin 1 (FM detector output)
Pin 1 is the audio FM output pin. A 200
resistor is connected
in series with the emitter follower.
(1) Audio multiplexing applications
Depending on the audio multiplexing decoder input
application, the input impedance may be low, the L-R
signals, etc., may be distorted, or the stereo characteristics
may be degraded. In this type of situation, add a resistor
between pin 1 and GND as shown in Fig. 6.
R1
^
5.1 k
(2) Monaural applications
Add a de-emphasis circuit with external CR.
t = CR
2
Pin 2 (FM discriminator)
Pin 2 is the phase shifter pin for an FM quadrature detector.
This pin generates the 90 deg phase shift signal needed for
quadrature detection and adds it to the multiplier.
(1) The detector band characteristics are primarily determined
by the coil Q and coil damping resistance. Determine the
damping characteristics in accordance with the output level
and band characteristics.
(2) When muting is applied, DC voltage (1 V or less) is
applied to point A.
LA7578N
No.4952-9/18
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