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PDF BA3426AS Data sheet ( Hoja de datos )

Número de pieza BA3426AS
Descripción Double cassette tape recorder system preamplifier
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA3426AS Hoja de datos, Descripción, Manual

Audio ICs
Double cassette tape recorder system
preamplifier
BA3426AS
The BA3426AS is a record / playback system preamplifier for radio cassette decks. It also has a CD input. It has three
control switches for function and tape mode switching and mic on / off.
It requires far fewer external components than its predecessors which means simplified assembly and overall savings.
FApplications
Dual-cassette radio cassette players.
FFeatures
1) Built-in switch for recording / playback equalize.
2) Motor control output provided.
3) CD input.
4) Smoothing capacitors to suppress switching noise
are not required.
5) Built-in bias oscillator transistor.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
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BA3426AS pdf
Audio ICs
BA3426AS
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BA3426AS arduino
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.
310

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