LA3401 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA3401

VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories

SANYO -> Panasonic 

LA3401

Muting output

Since the muting signal is delivered at the muting output (pin 11) in the following mode, external transistors can be

used to provide external muting.

¡ AM → FM changeover mode (muting in the changeover mode)

™ Muting mode

£ VCC–ON/OFF mode

Fig. 11 shows a sample application of external muting.

Muting in the VCC-ON mode

1. Muting time

Muting is turned ON for a certain period of time fixed

by external capacitor C13. Fig. 12 shows the relation

between the muting time and C13.

2. Values of AM/FM input coupling capacitors (C1, C2) and value of C13

If muting is released before the DC voltage on the AM input (pin 1) or FM input (pin 2) is stabilized after VCC is

turned ON, pop noise is generated. Therefore, the value of C13 must be determined by the input coupling capacitor

value. The adequate value of C13 for C1, C2 of 10µF is 10µF or thereabouts. If the value of C1, C2 is increased, the

value of C13 is also increased accordingly.

Feedback resistance of post amplifier and total gain, de-emphasis constant values

Table 1 shows the feedback resistance of post amplifier and total gain, de-emphasis

Table 1. Feedback resistance of post amplifier and total gain, de-emphasis

R1 (R2)

33kΩ

39kΩ

51kΩ

62kΩ

82kΩ

100kΩ

130kΩ

150kΩ

180kΩ

Total

3.0dB

4.5dB

6.5dB

8.5dB

11.0dB

13.0dB

15.0dB

16.0dB

17.5dB

C13 (C14) 50µs

1500pF

1200pF

1000pF

750pF

620pF

510pF

390pF

330pF

270pF

C13 (C14) 50ms

2200pF

2000pF

1500pF

1200pF

910pF

750pF

560pF

510pF

390pF

Total gain : Value in monaural mode

R1 · C15=R2 · C14=50µs, 75µs

No.1868–9/15

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