JVC KD-S7R Service Manual page 26

KD-S7R
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-
MUX ALIASING
4
FILTER
SCOUT 8
CLOCKED
CIN
7
COMPARATOR
VDDA
5
REFERENCE
3
Vref
VOLTAGE
VSSA
1-26
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
BANDPASS RECONSTRUCTION
(8th ORDER)
COSTAS LOOP
VARIABLE AND
FIXED DIVIDER
Vp1
CLOCK
REGENERATION
AND SYNC
6
Function
Quality indication output
RDS data output
Reference voltage output (0.5VDDA)
Multiplex signal input
+5V supply voltage for anarog part
Ground for analog part (0V)
Subcarrier input to comparator
Subcarrier output of reconstruction filter
Oscillator mode / test sontrol 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
OSCCILLATOR
AND
FILTER
DIVIDER
BIPHASE
SYMBOL
DECODER
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
9
10
MODE TEST
VDDD
12
QUAL
QUALITY BIT
1
GENERATOR
RDDA
DIFFERRENTIAL
2
DECODER
16 RDCL
15 T57
11
VSDD