Sharp CD-C470H Service Manual page 57

ICT21 VHiLC72720/-1:Audio Processor (LC72720)
Pin No. Terminal Name
1 VREF
2 MPXIN
3 Vdda
4 Vssa
5 FLOUT
6 CIN
7 T1
8 T2
9* T3 (RDCL)
10* T4 (RDDA)
11 * T5 (RSFT)
12 XOUT
13 XIN
14 Vddd
15 Vssd
16* T6 (ERROR/57K/BE1)
17* T7 (CORREC/ARI-ID/BE0
18* SYNC
19* RDS-ID
20 DO
21 CL
22 DI
23 CE
24 SYR
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Vdda
3
REFERENCE
VOLTAGE
Vssa
4
ANTIALIASING
MPXIN 2
FILTER
DO
20
CL
21
CCB
DI
22
CE
23
T1 7
8
T2
TEST
T3~T7
9,10,11
16,17
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CD-C470H,C470E,C480H/CP-C470H,C470E,C480H
Input/Output
Output Reference voltage output (Vdda/2)
Input Base band (multiplex) signal input
— Analog system power supply (+5V)
— Analog system ground
Output Sub-carrier input (comparator input)
Input Sub-carrier output (filter output)
Input Test input (to be always connected to ground)
Input Test input (standby control)
0: Normal operation/1: Standby state (crystal oscillation stop)
Input/Output Test I/O (RDS clock output)
Input/Output Test I/O (RDS data output)
Input/Output Test I/O (Soft judgment control data output)
Output Crystal oscillation output
Input Crystal oscillation input (external reference signal input)
— Digital system power supply
— Digital system ground
Input/Output Test I/O (Error existence/nonexistence output/playback carrier output/error block
number output)
Input/Output Test I/O (Error existence/nonexistence output/SK detection output/error block
number output)
Input/Output Block sync detection output
Output RDS detection output
Output Data output
Input Clock input
Input Data input
Input Chip enable
Input Sync and RAM address reset (positive logic)
FLOUT CIN
VREF
1 5 6
VREF
57kHz
BPF
(SCF) SMOOTHING
FILTER
RAM ERROR CORRECTION
(24 BLOCK DATA) (SOFT DECISION)
CLK(4.332MHz)
MEMORY CONTROL
13
XIN
Figure 57 BLOCK DIAGRAM OF IC
– 57 –
Function
Serial data interface (CCB)
CLOCK
PLL
RECOVERY
(57kHz)
(1187.5Hz)
DATA
DECODER
SYNC/EC CONTROLLER
SYNC
DETECT-1
DETECT-2
OSC/DIVIDER
12
XOUT
Vddd
14
Vssd
15
RDS-ID
19
SYNC
18
24 SYR
SYNC