LA3242 データシートの表示（PDF） - SANYO -> Panasonic

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LA3242

Preamplifier for Compact Cassette Recorder Recording-only Use

SANYO -> Panasonic 

LA3242

IC usage Notes

(1) The base of a PNP transistor is connected to input pins 2 and 23.

When a voltage is applied to input pins 2 and 23 externally, connect a

capacitor to the input pins. The recommended value of capacitor C is

0.1 µF to 10 µF. DC voltage VINDC with input pins 2 and 23 open is

50 mV max (VINDC = 20 mV typ).

For the relation between supply voltage VCC and VINDC, refer to the VCC – VINDC characteristic.

(2) Output waveform starting time (Refer to Data ts – Cr.)

Rise waveform at pin 7 or 18

When supply voltage VCC is switched ON, the amplifier output (pins 7 and 18) will rise. Output waveform ON time ts can be

varied by capacitor Cr connected to pin 12. The minimum value of Cr is 33 µF. If the value of Cr is made less than 33 µF, more

pop noise will occur and the ripple rejection will worsen at the time supply voltage VCC is switched ON. (ts = 0.7 s. typ at

Cr = 100 µF)

(3) Electronic switch control circuit

The control circuit for control pins 9 and 16 is configured as

shown left.

Control

pin

Electronic

SW ON

signal

Control level VCONT of the control circuit is given by:

VCONT = 1/2 × (VCC – 0.9) [V]

. 4 µAmin

(4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data VCONT – VCC.)

Electronic SW OFF

Electronic SW ON

Threshold region (. 1 V)

The control level at electronic switch CONT pin 9 and 16 is fixed

by supply voltage VCC. The threshold region has a range of

approximately 1 V. The middle point of threshold region at a

given value of supply voltage VCC is represented by approximately

1/2 × (VCC – 0.9) V.

The electronic switch can be turned ON/OFF by applying a

voltage of the middle point voltage ±0.5 V or more/less,

respectively, to electronic switch CONT pins 9 and 16.

No.2620-6/12

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