JVC KD-SX979R Service Manual page 26

SAA6579T-X (IC71) : RDS demodulator
1. Pin layout
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8 9
3. Block diagram
ANTI-
4
ALIASING
MUX
FILTER
8
SCOUT
7
CLOCKED
CIN
COMPARATOR
5
VDDA
3
REFERENCE
Vref
VOLTAGE
6
VSSA
2. Pin function
Pin
Symbol
No.
1 QUAL
2 RDDA
3 Vref
4 MUX
5 VDDA
6 VSSA
7 CIN
8 SCOUT
9 MODE
10 TEST
11 VSSD
12 VDDD
13 OSCI
14 OSCO
15 T57
16 RDCL
57kHz
RECONSTRUCTION
BAND PASS
FILTER
(8th ORDER)
COSTAS LOOP
VARIABLE AND
FIXED DIVIDER
Vp1
CLOCK
REGENERATION
AND SYNC
Function
Quality indication output
RDS data output
Reference voltage output (0.5VDDA)
Multiplex signal input
+5V supply voltage for analog part
Ground for analog part (0V)
Subcarrier input to comparator
Subcarrier output of reconstruction filter
Oscillator mode / test control input
Test enable input
Ground for digital part (0V)
+5V supply voltage for digital part
Oscillator input
Oscillator output
57kHz clock signal output
RDS clock output
OSCI OSCO
13 14
OSCILLATOR
AND
DIVIDER
BIPHASE
SYMBOL
DECODER
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
9 10
MODE TEST
KD-SX979R/KD-SX925R
KD-SX924R/KD-SX909R
VDDD
12
QUAL
1
QUALITY BIT
GENERATOR
RDDA
2
DIFFERENTIAL
DECODER
16
RDCL
15
T57
11
VSDD
2-23