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BA1442A PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BA1442A
기능 AM radio / FM IF stereo system IC
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BA1442A 데이터시트, 핀배열, 회로
Audio ICs
AM radio / FM IF stereo system IC
BA1442A
The BA1442A is an AM radio and FM IF stereo system IC developed for radio cassette players. The FM circuit is com-
prised of a differential IF amplifier, a double-balance type quadrature detector, and a PLL-type stereo MPX circuit. The
AM circuit is comprised of a local oscillator, a double-balanced mixer, an IF amplifier, a detector, and an AGC circuit.
FApplications
Radio cassette players
FFeatures
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 (3.3k) 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 opera-
tion.
9) The stereo indicator pin has a constant drive cur-
rent, and a current limiting resistor is not required.
10) Few external components required.
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
337




BA1442A pdf, 반도체, 판매, 대치품
Audio ICs
BA1442A
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BA1442A 전자부품, 판매, 대치품
Audio ICs
BA1442A
(7) AM AGC circuit
AGC is applied to the input shunt, mixer , and IF circuits.
The AGC reduces the mixer and IF circuit current, and
according the DC level of the detector output, reduces
the gain to control the output at a fixed level. In addition,
an input shunt is provided to prevent distortion caused by
strong input signals. The AGC pin is also used as the
MPX PLL filter pin. For this reason, when there is no in-
put, the AGC voltage becomes Vreg (pin 19), and when
there is a strong input signal, it is about Vreg - 0.2V.
(8) AM / FM detector circuits
There is one pin for both detector outputs (pin 6), and the
AM / FM switching is done internally. The output imped-
ance is 5k, and the DC output is 1.3V.
(9) The FM MPX circuit uses a PLL to recover the ste-
reo. For FM, the input from pin 7 is switched by the de-
coder and output on pin 11 (L channel) and pin 12 (R
channel). In the case of AM, the input is from pin 8, and
this is output through to pins 11 and 12. The audio fidelity
is improved by the low-pass filter comprised of the capac-
itor connected between pins 6 and 8 and the input imped-
ance of pin 8 (20k). The input / output gain for both AM
and FM is about 6dB. The VCO has been laser trimmed
on the chip to set its time constant. External components
and re-adjustment are not required.
FApplication example
343

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부품번호상세설명 및 기능제조사
BA1442A

AM radio / FM IF stereo system IC

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