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BA1451 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BA1451
기능 AM radio / FM IF stereo system IC
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BA1451 데이터시트, 핀배열, 회로
Audio ICs
AM radio / FM IF stereo system IC
BA1451F
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
Vreg
AM
OSC
AM AM IF
MIX
AM
DET
AGC
FM
IF
Vcc
12
SD
DET
3
GND
4
FM
DET
5
LED
DRIVER
COMP
6789
15 14 13
SD
1/2
SW 1/2
PD
DECODER
VCO
10 11 12




BA1451 pdf, 반도체, 판매, 대치품
Audio ICs
Pin No.
Function
MPX input
14
Input the FM detector output .
MPX input
15 Input the AM detector output after
low cut.
AM/FM detector output
16
Connect to the following stage MPX and
FM low pass filter.
AM AGC
17
Connect to a capacitor.
AM IF input
18
Connect to an AM ceramic filter.
Internal circuit
VCC 2
Vreg 23
14
15
GND 4
VCC 2
GND 4
VCC 2
16
5k
17
GND 4
VCC 2
18
20k
AM mixer output
19
Connect to primary side of AM IFT.
AM antenna
20
Connect to AM antenna.
GND 4
VCC 2
Vreg 23
20
GND 4
19
BA1451F
Quiescent pin voltage (V)
FM AM
2.1 2.1
2.1 2.1
2.1 2.1
00
5.0 5.0
5.0 5.0
2.1 2.1

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BA1451 전자부품, 판매, 대치품
Audio ICs
!Application example
BA1451F
8 76 5
BA4425F
1 23 4
BPF
24 23
OSC Vreg
OUT
22 21 20 19 18 17 16 15 14 13
AM BW Adj AM IN MIXOUT IFIN AGC DET MPX MPX SD
OSC
AM AM
OUT IN IN /
MONO
BA1451F
MUTE
/
FMIN VDD SD Adj GND FM DET TUN ST IF REQ IF OUT Rch
1 2 3 4 5 6 7 8 9 10
PD
/
Lch AMFM
11 12
Vcc2 (+9V)
18 17 16 15 14 13 12 11 10
GND PD2 PD1 VDD FMIN AMIN P2 P1 P0
BU2616F
XOUT XIN CE DA CL TUN SD IFIN P3
123456789
Vcc (5V)
Lch OUT
Rch OUT
CE DA CL
µ-COM
Fig. 2
!Electrical characteristic curves
S+D+N
0
10
7 20
6 30
5 40
Vcc=5V,
4 50 fIN=10.7MHz,
3
60
fm=1kHz
f=±22.5kHzdev,
AMR
RL
SEP
LR
2
70
pilot=±7.5kHzdev
Ta=25˚C,
1 80 AMR MOD=30%,
N
D+N (100%)
fm=400Hz
D+N (30%)
0 9020 0 20 40 60 80 100 120
INPUT VOLTAGE : VIN (dBµ)
Fig.3 FM input / output characteristics
TUNING
STEREO
TO LED etc.
180 110
170 100
160 90
150 80
140 70
130 60
120 50
110 40
100 30
90 20
80 10
70 0
11
10
9
8
7
6
5
RL
4
3
LR
VO
fIN=10.7MHz,
VIN=100dBµ,
f=±22.5kHzdev.
(pilot=±7.5kHzdev)
fIN=1kHz,
Ta=25˚C,
RSD=20k
TUNED ON
3dB L.S.
2
1
0
3
45
D+N (100%)
D+N (30%)
678
9
POWER SUPPLY VOLTAGE : VCC (V)
Fig.4 FM characteristics vs.
power suppy voltage

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