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BA3308 Arkusz danych(PDF) 5 Page - Rohm

Numer części BA3308
Szczegółowy opis  Dual preamplifier with ALC
Download  8 Pages
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Producent  ROHM [Rohm]
Strona internetowa  http://www.rohm.com
Logo ROHM - Rohm

BA3308 Arkusz danych(HTML) 5 Page - Rohm

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197
Audio ICs
BA3308 / BA3308F / BA3308FV
(2)
Playback (See Fig. 7)
During playback, the ch1 and ch2 amplifiers are used as
NAB equalizer amplifiers, and time constant circuits are
connected between pins 1 and 3, and 7 and 9 in the nega-
tive-feedback section to give the NAB characteristics.
The voltage gain is given by:
GV =
R11
) R9/ (I ) jϖC9 S R9) /R3
In the same way as for recording, the NAB time constant
circuit is adjusted to give the required gain (to prevent
generation of a “pop” noise when power is applied). The
output stage (pins 3 and 7) operating point is fixed at 3VF.
Therefore, as indicated in the VMax. vs, VCC characteristic
(see Fig. 19), even if the VCC voltage is made larger than
5V, the maximum output voltage will not exceed 1.2V
(typ.). The ALC circuit is not required for playback, so pin
5 is grounded. The S / N ratio during playback is better if
the external resistors R1 and R2 that are connected to the
input pins (2 and 8) for recording are switched out.


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