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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 1C over 25C.
!Recommended operating conditions (Ta=25C)
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.
1 330
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 tuning indicator.
GND 4
0.25
15k
0
4
GND
5 VCC 2
0
0
5
FM discriminator Connect to the discriminator coil.
5.0
5pF
5.0
GND 4
6
Tuning indicator Connect to a tuning indicator display device (eg. LED) Stereo indicator Connect to a stereo indicator display device (eg. LED)
6/7
-
-
7
GND 4
-
-
BA1451F
Audio ICs
Pin No.
Function * IF request Output the IF signal to pin9 excess of 4.0V. Stops the IF signal at equal to or less than 3.0V. * MUTE Apply to muting excess of 2.0V. Off the muting at equal to or less than 1.0V. Internal circuit
MUTE 10k IF OUT
Quiescent pin voltage (V) FM AM
10k 8
8
0
0
GND 4
VCC 2
9
IF output Output for the IF signal.
9
4.2
4.2
GND 4
VCC 2
10
R-channel output
1.5
1.5
10/11
11
5k
L-channel output
GND 4
1.5
1.5
12
* PLL filter Connect to a lag/lead filter.
82k
Vreg 23
12
* AM / FM band switch AM band when connected to GND.
GND 4
AM/FM
2.1
0
13
* Forced monaural Forced monaural operation connecting to get a resistor to mediate. (Recommended value : 10k to ground.) * Pilot filter Connect to a capacitor.
13 Vreg 23
4k
MONO
2.1
2.1
GND 4
BA1451F
Audio ICs
Pin No.
Function Internal circuit Quiescent pin voltage (V)
FM
AM
MPX input
14
Input the FM detector output .
VCC 2
100k
20k
2.1
2.1
Vreg 23
14
MPX input
15
15
Input the AM detector output after low cut.
2.1
GND 4
2.1
VCC 2
AM/FM detector output
16
Connect to the following stage MPX and FM low pass filter.
GND 4
5k
16
2.1
2.1
17
VCC 2
AM AGC
17
Connect to a capacitor.
20k
0
0
GND 4 VCC 2 18
3k
AM IF input
18
Connect to an AM ceramic filter.
5.0
5.0
GND 4
19
AM mixer output
VCC 2 Vreg 23
19
Connect to primary side of AM IFT.
5.0
30k
5.0
20
AM antenna
20
Connect to AM antenna.
GND 4
2.1
2.1
BA1451F
Audio ICs
Pin No.
Function Internal circuit
21 VCC 2
Quiescent pin voltage (V) FM AM
FM detector bandwidth adjustment
21
Connect a resistor from this pin to the reference voltage supply to set the required detector bandwidth.
GND 4
2.1
4.3k
2.1
23
Reference voltage supply Connected to a capacitor. AM local oscillator
2.1
2.1
22
Connect to the AM OSC circuit.
100
22
Vreg 23
2.1
2.1
24
AM local oscillator output
24
AM OSC output.
GND 4
1.7
1.4
!Electrical characteristics (Unless otherwise specified, Ta=25C 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 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 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) VO L.S S/N C.B AMR SEP THD SDS SDSW VIF VO Q.S S/N THD SDS VIF VOBuff Min. 13 11 340 34 72 -2 45 35 - 34 70 300 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 27 670 40 - +2 - - 1.6 44 150 530 120 28 - 1.8 31 530 280 Unit mA mA mVrms dBV dB dB dB dB % dBV kHz mVP-P mVrms dBV dB % dBV mVP-P mVrms Conditions
No input No input
VIN=100dBV,mono mono VIN=100dBV, mono VIN=100dBV, mono AM : V IN=60dBV, mod=30% , 400Hz VIN=100dBV, main VIN=100dBV, main Input for pin 6 current 1mA VIN=100dBV, mono IF request ON VIN=68dBV Input for S / N = 20dB VIN=68dBV VIN=68dBV Input for pin 6 current 1mA IF request ON
BA1451F
Audio ICs
!Test circuit
L4 47p 0.022 100 OSC OUT 20k 0.022 AM SG SG OSC MIX DET 0.022 24 23 Vreg 22 21 20 19 18 17 16 15 14 13 100 6800p 1 22 50 100p MONO 10 10k
AM STEREO T2
STEREO
Vreg MPX SD
DET
LED
MUTE REQ.
1
2 Vcc 0.022
3 GND
4
5
6
7
8
9
10
11
12
FM SG FM STEREO SG SG SG 1 50 100 0. 022 24k 3.9k
TUN.
ST. OFF IFREQ MUTE 0.01 0.01 0.022
0.22
AM
FM 3.3k
+B
IF OUT
R-ch
L-ch
0.047
L4 : AM OSC T2 : AM IFT CD1 : FM DISCRIMINATOR COIL
Sumida Toko Toko Sumida Toko
2157-JPS-029 A7BRS-12445X CFMA-258 0236-JPS-101 A119ACS-19197N
Units : R [] C [F]
Fig. 1
BA1451F
Audio ICs
!Application example
24 8 7 6 5
23
22
21
20
19
18
17
16
15
14
13 SD / MONO
OSC Vreg OUT
AM BW Adj AM IN MIXOUT IFIN AGC DET MPX MPX OSC AM AM OUT IN IN
BA4425F
1
BPF
BA1451F
4 FMIN 1 VDD SD Adj GND FM DET TUN 2 3 4 5 6 MUTE / ST IF REQ IF OUT 7 8 9 PD / AMFM 12
2
3
Rch 10
Lch 11
Vcc (5V)
Lch OUT Rch OUT
18
17
16 PD1
15
14
13
12 P2
11 P1
10 P0
GND PD2 Vcc2 (+9V) XOUT 1 XIN 2
VDD FMIN AMIN
BU2616F
CE 3 DA 4 CL 5 TUN 6 SD 7 IFIN 8 P3 9
CE
DA
CL TUNING TO LED etc. STEREO
-COM
Fig. 2
!Electrical characteristic curves
TOTAL HARMONIC DISTORTION : THD (%)
160 150 140
-3dBL, S, TUNED ON (dB) SEP (dB)
0 -10
Vo, AMR, SEP (dB)
S+D+N
90 80 70 60 50 40 30 20 10 0
TOTAL HARMONIC DISTORTION : THD (%)
180 170
110 100
11 10 9 8 7 6 5 4 3 2 1 0 3 4 5 6 D+N (100%) D+N (30%) 7 8 9
RL
VO
7 6 5 4 3 2 1 0
-20 -30 -40 Vcc=5V, -50 fIN=10.7MHz, fm=1kHz -60 f=22.5kHzdev, -70 pilot=7.5kHzdev Ta=25C, -80 AMR MOD=30%, fm=400Hz -90 -20 20 40 0
AMR RL SEP LR
Vo (mVrms)
130 120 110 100
LR TUNED ON -3dB L.S.
fIN=10.7MHz, VIN=100dB, f=22.5kHzdev. (pilot=7.5kHzdev) fIN=1kHz, Ta=25C, RSD=20k
N D+N (100%) D+N (30%) 60 80 100 120
90 80 70
INPUT VOLTAGE : VIN (dB)
POWER SUPPLY VOLTAGE : VCC (V)
Fig.3 FM input / output characteristics
Fig.4 FM characteristics vs. power suppy voltage
BA1451F
Audio ICs
10.80
TOTAL HARMONIC DISTORTION : THD (%)
60 SEP
CHANNEL SEPARATION : SEP (dB)
FM BAND WIDTH : fIN (MHz)
10.75
2
50
LR
40
RL
10.70
30
10.65
1
20
10.60 RBW=20k, VIN=100dB Ta=25C 10.55 3 4 5 6 7 8 9
10
Vcc=5V fIN=10.7MHz VIN=100dB f=22.5kHzdev pilot=7.5kHzdev Ta=25C THD 50 100 200 500 1k 2k
MAIN
R L
SUB MONO
0
0
5k 10k 20k
POWER SUPPLY VOLTAGE : Vcc (V)
FREQUENCY : fm (Hz)
Fig.5 FM bandwidth vs. power supply voltage
Fig.6 Channel separation and THD vs. frequency
TOTAL HARMONIC DISTORTION : THD (%)
10
100
10
TOTAL HARMONIC DISTORTION : THD (%)
100 90
OUTPUT VOLTAGE : Vo (mVrms)
S+D+N
0
3.0
90 80
Q.S. , TUNED ON : (dB)
9 8 7 6 5 4 3 2 1 0
OUTPUT VOLTAGE : VO (dB)
Vo
-10
80 70 60 50 40 30 20 10 D+N (30%) 0 3 4 5 6 7 8 9
Q.S.
S / N=20dB VAGC
-30 -40 -50 fIN=1000kHz, -60 MOD=30%,
Ta=25C fm=1kHz VOUT=5V,
70 60 50 40 30 20 10
10 9 8 7 6 5 4 3 2 1 0
VAGC (V)
-20
2.0
fIN=1000kHz, VIN=74dB, MOD=30% fm=1kHz, Ta=25C TUNED ON
N
D+N (80%) D+N (30%)
LED ON
1.0
D+N (80%)
-70 -20
0
50
100
0 120
0
INPUT VOLTAGE : VIN (dB)
POWER SUPPLY VOLTAGE : VCC (V)
Fig.7 AM input / output characteristics
Fig.8 AM characteristics vs. power suppy voltage
!External dimensions (Units : mm)
AM DETECTOR OUTPUT VOLTAGE : VO (dBm) TOTAL HARMONIC DISTORTION : THD (%)
10 0 -10 -20 -30 -40 -50 -60 -70 50 100 200 500 1k
VCC=5V fIN=1000MHz VIN=74dB MOD=30% Ta=25C
VO
15.0 0.2 24 13
10
D+N (80%)
7.8 0.3
5.4 0.2
1.8 0.1
5
1
12
0.11
1.27
0.4 0.1
0.3Min. 0.15
D+N (30%)
2k 5k 10k 20k
0
FREQUENCY : fm (Hz)
Fig.9 AM detector output and THD vs. frequency
SOP24
0.15 0.1

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