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BA1451F

Rohm
Part Number BA1451F
Manufacturer Rohm
Description AM radio / FM IF stereo system IC
Published Apr 1, 2005
Detailed Description BA1451F Audio ICs AM radio / FM IF stereo system IC BA1451F The BA1451F is a tuner system IC for electronic tuning for ...
Datasheet PDF File BA1451F PDF File

BA1451F
BA1451F

Overview
BA1451F Audio ICs AM radio / FM IF stereo system IC BA1451F The BA1451F is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX.
It has been developed for HiFi 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 HiFi 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.
!Block diagram 24 23 22 21 20 19 18 17 16 15 14 13 AM OSC Vreg AM MIX AM IF SD AM DET AGC 1/2 SW PD FM IF Vcc 1 2 FM DET SD DET 3 GND 4 5 6 7 8 9 10 11 12 VCO 1/2 LED DRIVER DECODER COMP BA1451F Audio ICs !Absolute maximum ratings Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 9.
0 450∗ 1 Unit V mW ˚C ˚C −25∼+75 −55∼+125 ∗ 1 Reduced by 4.
5mW for each increase in Ta of 1˚C over 25˚C.
!Recommended operating conditions (Ta=25°C) Parameter Power supply voltage Symbol VCC Min.
3.
8 Typ.
5.
0 Max.
8.
0 Unit V !Input and output circuits Pin No.
Function VCC 2 Vreg 23 Internal circuit Quiescent voltage (V) FM AM 1 FM IF amplifier input Connect to an FM ceramic filter.
1 330Ω 2.
1 2.
1 GND 4 2 VCC 3 VCC 2 5.
0 5.
0 FM tuning ON level adjustment 3 Connect a resistor from this pin to GND to set the required ON level for the tuni...


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