LA3460M データシートの表示（PDF） - SANYO -> Panasonic

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LA3460M

FM NC + MPX Demodulator for Car Stereo Tuners

SANYO -> Panasonic 

LA3460M

Usage Notes

1. Noise Canceller Block

• The noise canceller input (pin 23) has an input impedance of about 50 kΩ. Carefully consider low-area frequency

characteristics when determining the value of the coupling capacitor. In an application circuit that uses a 1 µF

capacitor, fc will be about 3 Hz.

• Pins 1 and 2 are used to set the noise detector sensitivity and the noise AGC level. Setting up these values is easier

if the noise sensitivity is set with pin 1 for a medium field strength (an antenna input of about 50 dBµ) first, and

then the AGC is adjusted with pin 2 for a weak field strength (20 to 30 dBµ). A point that requires caution is that

although the AGC action is improved if the noise detector sensitivity is increased, the weak field sensitivity will,

inversely, be lowered.

• The time constant of the monostable multivibrator (pin 3) will be about 30 µs when C is 0.001 µF and R is 100 kΩ.

The noise exclusion efficiency increases if the gate time is increased. However, distortion due to multipath and

overmodulation is increased.

2. MPX Block

• HCC (high cut control) frequency characteristics (pin 7)

The value of the external capacitor connected to pin 7 determines the output signal frequency characteristics during

HCC control.

No. 4842-11/13

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