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BA4424N

Rohm
Part Number BA4424N
Manufacturer Rohm
Description FM / TV front end
Published Apr 1, 2005
Detailed Description Audio ICs FM / TV front end BA4424N The BA4424N is a monolithic IC designed for FM front end use. It consists of an RF ...
Datasheet PDF File BA4424N PDF File

BA4424N
BA4424N

Overview
Audio ICs FM / TV front end BA4424N The BA4424N is a monolithic IC designed for FM front end use.
It consists of an RF amplifier circuit, mixer circuit, local oscillation circuit, IF buffer amplifier, and a variable capacitor-diode for AFC.
FFeatures 1) An RF amplifier, mixer, local oscillator, IF buffer amplifier, and AFC diode are included on-chip.
2) Reception of VHF terrestrial TV channels is possible.
3) Uses a double balance mixer to improve intermodulation characteristics.
4) Includes a clamp diode in the mixer output.
5) Local oscillation buffer on-chip for improved response to strong input.
6) The output impedance of the IF buffer amplifier is matched with the ceramic filter impedance at 330Ω.
FAbsolute maximum ratings (Ta = 25_C) 7) A resistive load can also be used for the mixer output.
8) Mixer input coupling capacitor included on-chip.
9) Includes a feedback capacitor for the local oscillation circuit.
10) Compact 9-pin SIP package.
Pins arranged for convenient mounting.
FRecommended operating conditions (Ta = 25_C) 48 Audio ICs FBlock diagram BA4424N FElectrical characteristics DC characteristics (unless otherwise noted, Ta = 25_C, VCC = 4V, no input) AC characteristics (unless otherwise noted, Ta = 25_C and VCC = 4V) 49 Audio ICs FMeasurement circuit BA4424N FPin connections 1 FM ANT input pin 2 3 4 5 : Connect to BPF ZIN = 75Ω RF amplifier bypass pin : Connect to bypass capacitor RF amplifier output load pin : Connect to RF tuning circuit MIX output pin : IFT or resistor load GND pin : IC ground pin 6 IF amplifier output pin 7 AFC diode pin 8 OSC pin 9 VCC pin : ZOUT = 330Ω : Cathode pin (anode pin is connected internally to ground) : Connect to resonating circuit : 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 output impedance of 75Ω should be used.
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