BA1442A - Rohm

BA1442A AM radio / FM IF stereo system IC

338 Audio ICs BA1442A 339 Audio ICs BA1442A 340 Audio ICs BA1442A FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V, FM IF MPX: fin = 10.7MHz, 400Hz modulation, 22.5kHz dev (30%), 19kHz 7.5kHz dev (10%) AM: fin = 1000kHz, fm = 400Hz 30%) FMeasurement circuit 341 Audio ICs FTechnical reference materials (unless otherwise n.

Features

1) The “S” curve characteristic of the FM detector can be used for upper heterodyne (“N” curve) operation. 2) Audio high cut and low cut can be used to improve the AM fidelity. 3) A reference voltage supply is provided to ensure good frequency stability in the shortwave bands. 4) Good FM stability. 5) Built-in damping resistor (3.3kΩ) for the quadrature coil. 6) The FM MPX uses a Laser Locked Loop, making adjustment of the VCO and addition of external components unnecessary. 7) Built-in forced monaural function for the MPX (VCO stops, LED off). 8) VCO of the MPX is switched off during AM oper.