BA1451 Datasheet PDF - ROHM Semiconductor
| Part Number | BA1451 | |
| Description | AM radio / FM IF stereo system IC | |
| Manufacturers | ROHM Semiconductor | |
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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
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Audio ICs
Pin No.
Function
FM detector bandwidth adjustment
21 Connect a resistor from this pin to the
reference voltage supply to set the
required detector bandwidth.
Reference voltage supply
23 Connected to a capacitor.
AM local oscillator
22
Connect to the AM OSC circuit.
AM local oscillator output
24
AM OSC output.
BA1451F
Internal circuit
VCC 2
21
GND 4
4.3kΩ
Quiescent pin voltage (V)
FM AM
2.1 2.1
2.1 2.1
Vreg 23
GND 4
22
2.1 2.1
24
1.7 1.4
!Electrical characteristics (Unless otherwise specified, Ta=25°C and VCC=5V)
FM IF MPX signal source : fiN=10.7MHz, modulation 1kHz, 75kHzdev (100%)
19kHz 7.5kHzdev (10%)
AM : fiN=1000kHz, modulation 1kHz 30%
Parameter
Quiescent current FM
Quiescent current AM
<FM IF MPX>
Detector output voltage
−3dB limiting sensitivity
Signal-to-noise ratio
Channel balance
AM suppression ratio
Channel separation
Total harmonic distortion
Station detector sensitivity
Station detector bandwidth
IF OUT output voltage
<AM>
Detector output voltage
Usable sensitivity
Signal-to-noise ratio
Total harmonic distortion
Station detector sensitivity
IF OUT output voltage
Local buffer output voltage
Symbol
IQ (FM)
IQ (AM)
Min.
13
11
VO
L.S
S/N
C.B
AMR
SEP
THD
SDS
SDSW
VIF
340
34
72
−2
45
35
−
34
70
300
VO
Q.S
S/N
THD
SDS
VIF
VOBuff
70
22
42
−
21
300
140
Typ.
21
19
480
37
80
0
55
45
0.5
39
100
400
90
25
52
0.6
26
400
200
Max.
29
27
Unit
mA No input
mA No input
Conditions
670 mVrms VIN=100dBµV,mono
40 dBµV mono
− dB VIN=100dBµV, mono
+2 dB VIN=100dBµV, mono
− dB AM : V IN=60dBµV, mod=30% , 400Hz
− dB VIN=100dBµV, main
1.6 % VIN=100dBµV, main
44 dBµV Input for pin 6 current ≥ 1mA
150 kHz VIN=100dBµV, mono
530 mVP-P IF request ON
120 mVrms VIN=68dBµV
28 dBµV Input for S / N = 20dB
− dB VIN=68dBµV
1.8 % VIN=68dBµV
31 dBµV Input for pin 6 current ≥ 1mA
530 mVP-P IF request ON
280 mVrms
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BA1451 electronic component. |
| Information | Total 8 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ BA1451.PDF Datasheet ] | |
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