LA3450 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA3450

PLL FM MPX Stereo Demodulator with Adjustment-Free VCO and Measure Against Adjacent Channel Interference

SANYO -> Panasonic 

Sample Printed Circuit Pattern

LA3450

Proper Cares in Applications

1. Ceramic resonator

Shown below are ceramic resonators recommended for use in the LA3450 and their suppliers.

CSB456F11 Murata Piezoelectric Division

TEL : 0762-40-2381

KBR-457HS Kyocera Electronic Parts Division

TEL : 075-592-3851

2. Loop filter constants

Loop filter constants (C3, C4, R1) connected to pins 3, 4 must be set to the optimum value according to an input pilot

level. The recommended values are shown in Table 1.

Input Pilot Level

C3

C4

R1

20mV or greater

0.47µF

1µF

3.3kΩ

14mV or greater

0.22µF

1µF

3.3kΩ

8mV or greater

0.1µF

0.47µF

6.8kΩ

Table 1. Input Pilot Level – Loop Filter Constants

Note : For example, when the loop filter constants are C3=0.22µF, C4=1µF, R1=3.3kΩ, stereo operation can be per-

formed with an input pilot level of 14mV or greater, even with the temperature characteristics of the OSC

circuit, the initial tolerance and secular chage of a ceramic resonator considerd.

No.2393–8/15

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