BA3426 Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BA3426

Double cassette tape recorder system preamplifier

ROHM Semiconductor 

Audio ICs

BA3426AS

FOperation notes

(1) Amplifier oscillation

As the BA3426AS incorporates dual-cassette dubbing

functions on a single IC, it has extremely high input / out-

put gain. In particular, in normal-speed mode, the gain at

around the recording equalizer peaking characteristic fo

frequency is about 70dB. The phases of the input and

output are reversed to reduce the chance of oscillation

due to influence of the PCB pattern, but due consider-

ation must be given to the PCB pattern design to prevent

oscillation. In particular, the PCB tracks to the Tape A

pins (pins 1 and 4) and Tape B pins (pins 31 and 32)

should be sufficiently far apart that there is no coupling

capacitance between them, or they should be shieded by

having a GND or bias track between them.

FElectrical characteristics curves

(2) Strong RF signals

To prevent signal mixing due to strong electric fields, con-

nect a capacitor (of a few hundred pF) to each input pin.

These must be connected close to the pins of the IC to

have any effect. Design the PCB track layout so that the

capacitors can be connected as close to the base of the

pins as possible.

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