Harman Kardon AVR 3550 Service Manual ▷ View online
S5
S1
S2
6.2dB
Amp
75
dirver
6.2dB
Amp
6.2dB
Amp
S4
S3
S6
S7
20K
20K
20K
13
Vin1
V+
V-
SW2
SW1
Vout1
Vout2
Vout3
SW4
BLOCK DIAGAM (NJM2296M ) : IC41, 43, 44
SW3
GND
SW5
Vin2
Vin3
Vin4
Vin5
1
15
11
16
10
14
12
2
9
7
5
4
6
8
3
20K
20K
20K
20K
20K
75
dirver
75
dirver
NJM2068M : IC23~29 , 32~34 , 82,88
RDS demodulato
r (
SAA6579
TV1) : IC71
BLOCK DIAGRAM
handbook, full pagewidth
SAA6579
0.1
µ
F
ANTI-
ALIASING
FILTER
57 kHz
BANDPASS
(8th ORDER)
RECONSTRUCTION
FILTER
OSCILLATOR
AND
DIVIDER
CLOCKED
COMPARATOR
COSTAS LOOP
VARIABLE AND
FIXED DIVIDER
FIXED DIVIDER
CLOCK
REGENERATION
AND SYNC
BIPHASE
SYMBOL
DECODER
DIFFERENTIAL
DECODER
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
REFERENCE
VOLTAGE
2.2
µ
F
4
7
8
5
3
6
VDDA
Vref
V
P1
13
14
QUAL
RDDA
RDCL
T57
QUALITY BIT
GENERATOR
1
2
15
16
11
12
2.2 k
Ω
82 pF
47 pF
4.332/8.664 MHz
MPX
signal
330 pF
9
10
MODE
TEST
560 pF
MEH162
VSSD
V
DDD
+
5 V
+5 V
OSCO
OSCI
MUX
SCOUT
CIN
0.1
µ
F
VSSA
Fig.1 Block diagram and application circuit.
Via pin MODE two different crystal frequencies can be used.
MODE
CRYSTAL CLOCK
LOW
4.332 MHz
HIGH
8.664 MHz
PIN FUNCTION & PIN ASSIGNMENT
PINNING
SYMBOL
PIN
DESCRIPTION
QUAL
1
quality indication output
RDDA
2
RDS data output
V
ref
3
reference voltage output (0.5V
DDA
)
MUX
4
multiplex signal input
V
DDA
5
+5 V supply voltage for analog part
V
SSA
6
ground for analog part (0 V)
CIN
7
subcarrier input to comparator
SCOUT
8
subcarrier output of reconstruction filter
MODE
9
oscillator mode/test control input
TEST
10
test enable input
V
SSD
11
ground for digital part (0 V)
V
DDD
12
+5 V supply voltage for digital part
OSCI
13
oscillator input
OSCO
14
oscillator output
T57
15
57 kHz clock signal output
RDCL
16
RDS clock output
handbook, halfpage
SAA6579
MGD684
1
2
3
4
5
6
7
8
QUAL
RDDA
Vref
MUX
VDDA
VSSA
CIN
SCOUT
RDCL
T57
OSCO
OSCI
VDDD
VSSD
TEST
MODE
16
15
14
13
12
11
10
9
Fig.2 Pin configuration.
Fig.3 Pin configuration.
handbook, halfpage
MGD685
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
QUAL
RDDA
Vref
MUX
VDDA
VSSA
CIN
SCOUT
RDCL
T57
OSCO
OSCI
VDDD
VSSD
TEST
MODE
SAA6579T
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