BA1449F ROHM Electronics, BA1449F Datasheet

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BA1449F

Manufacturer Part Number
BA1449F
Description
Manufacturer
ROHM Electronics
Datasheet
The BA1448S and BA1449F are electronic tuning system ICs for AM, FM IF, and MPX. They have been developed for
use in radio cassette players and mini-component stereo systems.
The FM detector and MPX VCO circuits do not require adjustment, which will reduce the number of assembly line pro-
cesses. In particular, the VCO is laser locked, and requires no adjustment or external components. The characteristics
of the two chips are the same, but the packages are different (24-pin SDIP for the BA1448S and 24-pin SOP for the
BA1449F).
FApplications
Synthesized tuners in radio cassette players and mini-
component stereo systems.
FFeatures
1) Built-in mono AM radio, FM IF amplifier / detector,
2) DTS compatible (both SD and IF count).
3) Built-in reference voltage supply for good short-wave
4) Good FM stability.
5) FM detector does not require adjustment (ceramic
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
354
AM radio / FM IF stereo system IC
BA1448S / BA1449F
Audio ICs
and FM stereo demodulator.
band frequency stability.
discriminator).
10) Mute possible for IF request.
6) FM MPX VCO is laser locked and requires no ad-
7) Built-in forced monaural function for the MPX (VCO
8) Audio can be low-cut to improve AM fidelity.
9) VCO for the MPX switches off during AM operation.
justment or external components.
stops, LED off).

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BA1449F Summary of contents

Page 1

... AM radio / FM IF stereo system IC BA1448S / BA1449F The BA1448S and BA1449F are electronic tuning system ICs for AM, FM IF, and MPX. They have been developed for use in radio cassette players and mini-component stereo systems. The FM detector and MPX VCO circuits do not require adjustment, which will reduce the number of assembly line pro- cesses ...

Page 2

... Audio ICs FBlock diagram BA1448S / BA1449F 355 ...

Page 3

... Audio ICs FInput / output circuits 356 BA1448S / BA1449F ...

Page 4

... Audio ICs BA1448S / BA1449F 357 ...

Page 5

... Audio ICs 358 BA1448S / BA1449F ...

Page 6

... Audio ICs FElectrical characteristics (unless otherwise noted 25_C, V Signal source FM IF MPX 10.7MHz, 1kHz modulation 22.5kHz dev (30%), IN Signal source FM IF MPX f = 10.7MHz, IN Signal source AM IF MPX 1000kHz, 1kHz modulation 30 5V) CC 19kHz modulation 7.5kHz dev (10%) BA1448S / BA1449F 359 ...

Page 7

... Audio ICs FMeasurement circuit 360 BA1448S / BA1449F ...

Page 8

... Audio ICs FApplication example FElectrical characteristic curves BA1448S / BA1449F 361 ...

Page 9

... Audio ICs FExternal dimensions (Units: mm) 362 BA1448S / BA1449F ...

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