BA1449F [ETC]
AM/FM Receiver Circuit ; AM / FM接收器电路\n
| 型号： | BA1449F |
| 厂家： | 
ETC |
| 描述： | AM/FM Receiver Circuit
|
| 文件： | 总9页 (文件大小：184K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Audio ICs
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. 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,
and FM stereo demodulator.
6) FM MPX VCO is laser locked and requires no ad-
justment or external components.
2) DTS compatible (both SD and IF count).
3) Built-inreference voltage supply for good short-wave
band frequency stability.
7) Built-in forced monaural function for the MPX (VCO
stops, LED off).
8) Audio can be low-cut to improve AM fidelity.
9) VCO for the MPX switches off during AM operation.
10) Mute possible for IF request.
4) Good FM stability.
5) FM detector does not require adjustment (ceramic
discriminator).
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
354
Audio ICs
BA1448S / BA1449F
FBlock diagram
355
Audio ICs
BA1448S / BA1449F
FInput/output circuits
356
Audio ICs
BA1448S / BA1449F
357
Audio ICs
BA1448S / BA1449F
358
Audio ICs
BA1448S / BA1449F
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 5V)
Signal source FM IF MPX: fIN = 10.7MHz, 1kHz modulation 22.5kHz dev (30%),
Signal source FM IF MPX fIN = 10.7MHz, 19kHz modulation 7.5kHz dev (10%)
Signal source AM IF MPX: fIN = 1000kHz, 1kHz modulation 30%
359
Audio ICs
BA1448S / BA1449F
FMeasurement circuit
360
Audio ICs
BA1448S / BA1449F
FApplication example
FElectrical characteristic curves
361
Audio ICs
BA1448S / BA1449F
FExternal dimensions (Units: mm)
362
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