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CD-C1H/CP-C1H
– 59 –
1 VREF Output Reference voltage output (Vdda/2)
2 MPXIN Input Base band (multiplex) signal input
3 VDDA — Analog system power supply (+5V)
4 VSSA — Analog system ground
5 FLOUT Output Sub-carrier input (comparator input)
6 CIN Input Sub-carrier output (filter output)
7 T1 Input Test input (to be always connected to ground)
8 T2 Input Test input (standby control)
0: Normal operation/1: Standby state (crystal oscillation stop)
9* T3 (RDCL) Input/Output Test I/O (RDS clock output)
10* T4 (RDDA) Input/Output Test I/O (RDS data output)
11 * T5 (RSFT) Input/Output Test I/O (Soft judgment control data output)
12 XOUT Output Crystal oscillation output
13 XIN Input Crystal oscillation input (external reference signal input)
14 VDDD — Digital system power supply
15 VSSD — Digital system ground
16* T6 (ERROR/57K/BE1) Input/Output Test I/O (Error existence/nonexistence output/playback carrier output/error block
number output)
17* T7 (CORREC/ARI-ID/BE0 Input/Output Test I/O (Error existence/nonexistence output/SK detection output/error block
number output)
18* SYNC Input/Output Block sync detection output
19* RDS-ID Output RDS detection output
20 DO Output Data output
21 CL Input Clock input Serial data interface (CCB)
22 DI Input Data input
23 CE Input Chip enable
24 SYR Input Sync and RAM address reset (positive logic)
ICT21 VHiLC72720/-1: RDS Microcomputer (LC72720)
Terminal NamePin No. Input/Output
Function
Figure 59 BLOCK DIAGRAM OF IC
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
ICT21 VHiLC72720/-1: RDS Microcomputer (LC72720)
VDDA
VREF
VREF
FLOUT
CIN
VSSA
VDDD
VSSD
RDS-ID
SYNC
SYR
XOUTXIN
DO
CL
DI
CE
T1
T2
REFERENCE
VOLTAGE
57kHz
BPF
(SCF)
ANTIALIASING
FILTER
CCB
TEST
SMOOTHING
FILTER
RAM
(24 BLOCK DATA)
ERROR CORRECTION
(SOFT DECISION)
PLL
(57kHz)
CLOCK
RECOVERY
(1187.5Hz)
DATA
DECODER
SYNC
DETECT-1
OSC/DIVIDER
MEMORY CONTROL
CLK(4.332MHz)
SYNC
DETECT-2
SYNC/EC CONTROLLER
156
3
4
2
20
21
22
23
7
8
13 12
24
18
19
15
14
MPXIN
9
10
11
17
T3
T4
T5
T7
16
T6
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