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參數(shù)資料
| 型號： | LA7578 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 252K |
| 代理商： | LA7578 |
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.4037-9/18
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