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BA3430FS Datenblatt(PDF) 11 Page - Rohm

Teilenummer BA3430FS
Bauteilbeschribung  Stereo pre-amplifiers with mute detection circuits for car stereos
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Hersteller  ROHM [Rohm]
Direct Link  http://www.rohm.com
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279
Audio ICs
BA3430S / BA3430F / BA3430FS
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 10k
Ω 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.
(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 22k
Ω or more.


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