LA3241 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LA3241

Preamplifier for Compact Cassette Recording-Only Use

SANYO -> Panasonic 

LA3241

(4) Relationship between the electronic switch on and off control voltage levels and the power supply voltage

(See VCC – VCONT for the data.)

VCONT

VCC(V)

ILA00611

When the supply voltage VCC is determined, the corresponding

electronic switch control pin (pins 9 and 16) control levels will be

determined. There is a threshold area of about 1 V. The center

point of the threshold area for a given supply voltage VCC will be

roughly:

1/2 × (VCC – 0.9) [V]

Therefore, the electronic switches can be turned on and off

reliably by applying voltages that are at least ±0.5 V of this center

point voltage to the electronic switch control pins (pins 9 and 16).

(5) Add a 470 pF capacitor between pin 15 and ground to prevent oscillation at low temperature in the microphone

amplifier output.

input

11

10

+

--

10kΩ

15

+

output

ILA00612

(6) The ALC switching level can be implemented with pin 7. The IC supply voltage VCC must be turned off temporarily

when switching to prevent ALC failure.

ALC Drive

SBD × 4

18

50Ω

TR1

7

TR2

8 17

ILA00613

Rectifier Block Equivalent Circuit

(7) Although the ALC level is converted by opening (0.7 V) or shorting (0.46 V) pin 17, basically, the ALC start DC

threshold level is switched by turning transistor TR2 on (pin 17 open) or off (pin 17 shorted).

No. 2564-7/15

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