LA4270 Ver la hoja de datos (PDF) - SANYO -> Panasonic
Número de pieza
componentes Descripción
Fabricante
LA4270 Datasheet PDF : 9 Pages
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LA4270
External Muting
1. Lowering of potential at ripple filter pin (pin 3).
Muting can be provided by discharging resistor R
connected across pin 3 and GND to lower the po-
tential at pin 3. Too small an R value causes pop
noise to occur ; and too large an R value causes
muting to fail to work.
If no adequate R value is obtained, it is recom-
mended that the R value is made rather small and
the C5 value is increased.
2. Application of positive bias to NF pins.
Muting can be provided by positive bias applied to
the NF pins. In this case, the R value must be de-
termined so that the potential at the NF pins (pins
1, 6) does not exceed 3V at the muting mode.
Voltage Gain
The voltage gain is fixed to 40dB by the ratio of
on-chip resistors 30kΩ and 300Ω. It is impossible
to use the IC at a voltage gain greater than this. In
an application where the IC is used at a voltage
gain of less than 40dB, resistors are connected in
series with feedback resistors as shown right. In
this application, however, oscillation is liable to
occur. So, the voltage gain must not be less than
30dB.
Sample Application Circuit 2 : Bridge amplifier use
No.1724–4/9
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