Rohm BA1450S Am radio / fm if stereo system ic Datasheet

Audio ICs
AM radio / FM IF stereo system IC
BA1450S
The BA1450S is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for Hi-Fi
component applications.
The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes.
In particular, the laser lock technique used in the VCO means that no external adjustment is required.
Applications
Synthesized tuner for Hi-Fi components.
Features
1) Built-in AM monaural radio, FM IF amplifier / detector,
and FM stereo demodulator.
2) DTS (both SD and IF count) compatible.
3) Built-in reference voltage power supply provides
good shortwave band frequency stability.
4) Good FM stability.
5) The FM MPX VCO uses laser locking making adjustment and external components unnecessary.
6) Built-in forced monaural operation function for MPX
(VCO stops, and LED goes off).
7) Low cutoff of audio is possible to improve AM fidelity.
8) MPX VCO stops in AM mode.
9) Audio muting is possible when an IF request is made.
Absolute maximum ratings (Ta = 25C)
Recommended operating conditions (Ta = 25C)
295
Audio ICs
Block diagram
296
BA1450S
Audio ICs
BA1450S
Input / output circuits
297
Audio ICs
298
BA1450S
Audio ICs
BA1450S
299
Audio ICs
300
BA1450S
Audio ICs
BA1450S
Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 5V)
FM IF MPX signal source: fIN = 10.7MHz, modulation 1kHz, 75kHzdev (100%)
FM IF MPX signal source fIN = 10.7MHz, modulation 19kHz 7.5kHzdev (10%)
IF MPX signal sourceAM: fIN = 1000kHz, modulation 1kHz 30%
301
Audio ICs
Measurement circuit
302
BA1450S
Audio ICs
BA1450S
Application example
Electrical characteristics curves
303
Audio ICs
BA1450S
External dimensions (Units: mm)
304
Similar pages