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BA4424 データシート(PDF) 3 Page - Rohm

部品番号 BA4424
部品情報  FM / TV front end
Download  7 Pages
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BA4424 データシート(HTML) 3 Page - Rohm

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50
Audio ICs
BA4424N
FMeasurement circuit
FPin connections
1 FM ANT input pin
: Connect to BPF ZIN =
75
2 RF amplifier bypass pin
: Connect to bypass ca-
pacitor
3 RF amplifier output load pin : Connect to RF tuning
circuit
4 MIX output pin
: IFT or resistor load
5 GND pin
: IC ground pin
6 IF amplifier output pin
: ZOUT = 330
7 AFC diode pin
: Cathode pin (anode pin
is connected internally
to ground)
8 OSC pin
: Connect to resonating
circuit
9 VCC pin
: IC voltage supply pin
FCircuit operation
(1)
RF amplifier circuit
The RF amplifier consists of a common base transistor.
A band pass filter (BPF) is used in the ANT circuit, and
as the RF amplifier is base-grounded, a BPF with an out-
put impedance of 75
Ω should be used. If a BPF without
DC cutoff is used, a coupling capacitor will be necessary.
An LC tuning circuit is connected to form the output load
of the RF amplifier. A coil with tap or coil with secondary
winding can be used to reduce spurious ratios such as
image ratios. A coupling capacitor for the mixer circuit is
included on-chip. The bypass capacitor for the RF ampli-
fier should have good high frequency characteristics,
and it should be connected to the input BPF ground con-
nection as close as possible to Pin 5 (GND), such that the
connection pattern absolutely does not allow supply cur-
rent to flow from Pin 5.


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