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BA4424 View Datasheet(PDF) - ROHM Semiconductor

Part Name
Description
View to exact match
BA4424
ROHM
ROHM Semiconductor ROHM
BA4424 Datasheet PDF : 7 Pages
1 2 3 4 5 6 7
Audio ICs
BA4424N
(2) Mixer circuit
The mixer circuit is a double balance type with minimal
OSC leakage and little spurious interference. The mixer
output includes a diode limiter for improved response to
strong input signals.
(4) IF buffer amplifier circuit
The IF buffer amplifier consists of an emitter-follower am-
plifier circuit. The output impedance is set in the IC to
330, and it can be directly connected to a ceramic filter.
In addition to an IFT, a resistive load can also be used for
the mixer output load. However, take care in this case as
the gain will fall.
(3) Local oscillation circuit
The local oscillation circuit is a Colpitts circuit with
grounded collector. The capacitor between the base and
emitter and the capacitor between the collector and emit-
ter which form the oscillation circuit are included on the
IC. A buffer has been added for input to the mixer circuit
to protect the circuit when strong input is present. R8 is
to prevent spurious radiation. Take care when setting the
value.
(5) Variable capacitor-diode for AFC
A variable capacitor-diode is included in the IC for AFC.
Utilize the FM detection output as AFC signal. The anode
is connected to ground.
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