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PDF BA3430FS Data sheet ( Hoja de datos )
| Número de pieza | BA3430FS | |
| Descripción | Stereo pre-amplifiers with mute detection circuits for car stereos | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Audio ICs
Stereo pre-amplifiers with mute
detection circuits for car stereos
BA3430S / BA3430F / BA3430FS
The BA3430S, BA3430F, and BA3430FS are stereo pre-amplifiers with mute detection circuits which have been de-
signed for use in car stereos. The analog circuitry including the pre-amplifier and mute detection and the digital circuitry
such as control logic circuits have been combined together on a single chip. This has made it possible to reduce the
interface with the microcontroller to five parallel inputs and outputs, and enables a very compact circuit configuration
around the tape head.
The BA3430S, BA3430F, or BA3430FS makes it possible to easily incorporate an ultra-compact, high-precision pre-am-
plifier board into the mechanical components of a car stereo.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
269
1 page  
Audio ICs
FMeasurement circuit
BA3430S / BA3430F / BA3430FS
FAudio signal amplification circuit
(1) Input switch circuit
This circuit switches between head A and head B as
needed for the auto reverse function.
A 10kΩ or less resistor must be connected to the input pin
to limit the input current.
Equivalent circuit schematic
The electrolytic capacitor between the input pin and
ground is for preventing switch noise. Although it is pos-
sible to prevent switch noise in the audio output without
this capacitor by using the mute circuit, switch noise in
the mute detection circuit will not be prevented and noise
will be recognized as a song.
Truth table
273
5 Page 
Audio ICs
FOperation notes
(1) Application circuit
The application circuit is an example of a circuit we re-
commend, however, before using it further examination
of characteristics and patent issues is necessary. If any
of the values of the external connections are changed, be
sure to take into consideration both the quiescent and
transient characteristics of the IC and external compo-
nents, and also deviations in the characteristics.
(2) Resistor values for switch pins
To prevent incorrect operation of the switch pins, use a
3k to 10kΩ resistor at Pins 20 and 23, and a 2k to 22kΩ
resistor at Pins 21 and 22.
(3) Capacitors for switch pins
The capacitors connected to Pins 20 and 23 are for pre-
venting incorrect operation of the mute detection circuit.
Without these capacitors, the switching sound which oc-
curs when the internal switches are switched will cause
the mute detection output pin (Pin 24) to go low even
when there is no signal, and this error will continue
throughout the mute detection time. If a short mute detec-
tion time is set and the error can be tolerated, the capaci-
tors can be omitted. The capacitors at Pins 21 and 22 are
for preventing a “pop” sound in the audio signal. If the pop
sound is muted at a latter stage, the capacitors can be
omitted. Naturally, the mute detection circuit will still op-
erate correctly if they are omitted.
BA3430S / BA3430F / BA3430FS
(4) Song detection output / input level
The song detection output / input level can be set with the
resistors connected to Pins 3 and 4. Small values for
these resistors will create a large amplifier gain, lowering
the song detection output / input level. The song detec-
tion output / input level in the application circuit is
*93.5dBV (5kHz) during playback and *81dBV
(10kHz) during fast forward.
(5) Frequency characteristics of sensitivity switch am-
plifier
The low cutoff frequency during playback can be set with
the capacitor and resistor values of Pin 3. The low cutoff
frequency during fast forward can be set with the capaci-
tor and resistor values of Pin 4, and the high cutoff fre-
quency can be set with the capacitor connected to Pin 5
and the internal resistor.
(6) Song detection time
The song detection time can be set with the capacitor
connected to Pin 2. If the time is too short, short noise sig-
nals will also cause the circuit to operate. Set the time as
long as possible.
(7) Mute detection time
The mute detection time is proportional to the product of
the capacitor and resistor between the supply voltage
and Pin 2. Taking into consideration the allowed IC cur-
rent, select a resistor which is 22kΩ or more.
279
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet BA3430FS.PDF ] | |
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