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PDF BA3308 Data sheet ( Hoja de datos )
| Número de pieza | BA3308 | |
| Descripción | Dual preamplifier with ALC | |
| Fabricantes | ROHM Semiconductor | |
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Audio ICs
Dual preamplifier with ALC
BA3308 / BA3308F / BA3308FV
The BA3308, BA3308F and BA3308FV are dual preamplifier ICs with built-in ALC circuits, and have been designed for
use in stereo radio-cassette recorders and tape recorders. They come in compact 9-pin SIP (BA3308), 14-pin MF
(BA3308F) and 14-pin SSOP (BS3308FV) packages, and have two record / playback preamplifiers, and an ALC circuit.
The preamplifiers have high gain and low distortion, and can be directly coupled to the tape head without coupling capaci-
tors. This prevents tape head magnetization and “pop” noise generation.
A built-in rectifier means that an ALC circuit with good channel balance and large dynamic range can be constructed
with addition of just an external time constant circuit.
The ICs also include power-on mute circuits that suppress “pop” noise generation.
FApplications
Stereo radio cassette recorders, cassette decks and
home stereo systems and music centers
FFeatures
1) Built-in ALC rectifier diode.
2) Wide operating power supply voltage range (VCC =
4.5V to 14V).
3) Low current dissipation (IQ = 3.5mV).
4) High gain (GVO = 80dB).
5) Low distortion (THD = 0.1%).
6) Low noise (VNIN = 1µVrms)
7) Input coupling capacitors and not necessary.
8) Good ALC channel balance.
9) Power-on mute circuit.
10) ALC dynamic range can be varied by the addition
of an external input resistor.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
193
1 page  
Audio ICs
(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
BA3308 / BA3308F / BA3308FV
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.
197
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA3308.PDF ] | |
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