CMOS IC
Ordering number : EN5877
51398RM (OT) No. 5877-1/14
LC72720N, 72720NM
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Overview
The LC72720N and LC72720NM are single-chip system
ICs that implement the signal processing required by the
European Broadcasting Union RDS (Radio Data System)
standard and by the US NRSC (National Radio System
Committee) RDBS (Radio Broadcast Data System)
standard. These ICs include band-pass filter, demodulator,
synchronization, and error correction circuits as well as
data buffer RAM on chip and perform effective error
correction using a soft-decision error correction technique.
Functions
Band-pass filter: Switched capacitor filter (SCF)
Demodulator: RDS data clock regeneration and
demodulated data reliability information
Synchronization: Block synchronization detection (with
variable backward and forward protection conditions)
Error correction: Soft-decision/hard-decision error
correction
Buffer RAM: Adequate for 24 blocks of data (about 500
ms) and flag memory
Data I/O: CCB interface (power on reset)
Features
Error correction capability improved by soft-decision
error correction
The load on the microcontroller can be reduced by
storing decoded data in the on-chip data buffer RAM.
Two synchronization detection circuits provide
continuous and stable detection of the synchronization
timing.
Data can be read out starting with the backward-
protection block data after a synchronization reset.
Fully adjustment free
Operating power-supply voltage: 4.5 to 5.5 V
Operating temperature: 40 to +85C
Packages: DIP24S, MFP24
Package Dimensions
unit: mm
3067-DIP24S
unit: mm
3045B-MFP24
SANYO: DIP24S
[LC72720N]
SANYO: MFP24
[LC72720NM]
CCB is a trademark of SANYO ELECTRIC CO., LTD.
CCB is SANYO's original bus format and all the bus
addresses are controlled by SANYO.
Single-Chip RDS
Signal-Processing System LSI
Pin Assignment
Block Diagram
No. 5877-2/14
LC72720N, 72720NM
T3 to T7
Pin Descriptions
No. 5877-3/14
LC72720N, 72720NM
Pin No.
Pin name
Function
I/O
Equivalent circuit
1
VREF
Reference voltage output (Vdda/2)
Output
2
MPXIN
Baseband (multiplexed) signal input
Input
5
FLOUT
Subcarrier output (filter output)
Output
6
CIN
Subcarrier input (comparator input)
Input
3
Vdda
Analog system power supply (+5 V)
--
--
4
Vssa
Analog system ground
--
--
12
XOUT
Crystal oscillator output (4.332/8.664 MHz)
Output
13
XIN
Crystal oscillator input (external reference signal input)
7
T1
Test input (This pin must always be connected to ground.)
Input
8
T2
Test input (standby control)
0: Normal operation, 1: Standby state (crystal oscillator stopped)
9
T3 (RDCL)
Test I/O (RDS clock output)
10
T4 (RDDA)
Test I/O (RDS data output)
11
T5 (RSFT)
Test I/O (soft-decision control data output)
16
T6 (ERROR/57K/BE1)
Test I/O (error status output, regenerated carrier output, error block count
I/O
*
output)
17
T7 (CORREC/ARI-ID/BE0)
Test I/O (Error correction status output, SK detection output, error block count
output)
18
SYNC
Block synchronization detection output
19
RDS-ID
RDS detection output
Output
20
DO
Data output
21
CL
Clock input
22
DI
Data input
Input
23
CE
Chip enable
24
SYR
Synchronization and RAM address reset (active high)
14
Vddd
Digital system power supply (+5 V)
--
--
15
Vssd
Digital system ground
--
--
Note:
*
Normally function as an output pin. Used as an I/O pin in test mode, which is not available to user applications.
Serial data interface (CCB)
No. 5877-4/14
LC72720N, 72720NM
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
DD
max
Vddd, Vdda (Vdda
Vddd + 0.3 V)
0.3 to +7.0
V
V
IN
1 max
CL, DI, CE, SYR, T1, T2, T3, T4, T5, T6, T7, SYNC
0.3 to +7.0
V
Maximum input voltage
V
IN
2 max
XIN
0.3 to Vddd +0.3
V
V
IN
3 max
MPXIN, CIN
0.3 to Vdda +0.3
V
V
O
1 max
DO, SYNC, RDS-ID, T3, T4, T5, T6, T7
0.3 to +7.0
V
Maximum output voltage
V
O
2 max
XOUT
0.3 to Vddd +0.3
V
V
O
3 max
FLOUT
0.3 to Vdda +0.3
V
I
O
1 max
DO, T3, T4, T5, T6, T7
6.0
mA
Maximum output current
I
O
2 max
XOUT, FLOUT
3.0
mA
I
O
3 max
SYNC, RDS-ID
20.0
mA
Allowable power dissipation
Pd max
Ta
85C
DIP24S:
350
mW
MFP24:
300
mW
Operating temperature
Topr
40 to +85
C
Storage temperature
Tstg
55 to +125
C
Specifications
Absolute Maximum Ratings
at Ta = 25C, Vssd = Vssa = 0 V
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Supply voltage
V
DD
1
Vddd, Vdda (Vddd = Vdda)
4.5
5.0
5.5
V
V
DD
2
Vddd: Serial data hold voltage
2.0
V
Input high-level voltage
V
IH
CL, DI, CE, SYR, T1, T2
0.7 Vddd
6.5
V
Input low-level voltage
V
IL
CL, DI, CE, SYR, T1, T2
0
0.3 Vddd
V
Output voltage
V
O
DO, SYNC, RDS-ID, T3, T4, T5, T6, T7
6.5
V
V
IN
1
MPXIN : f = 57 2 kHz
50
mVrms
Input amplitude
V
IN
2
MPXIN : 100% modulation composite
100
mVrms
V
XIN
XIN
400
1500
mVrms
Guaranteed crystal oscillator frequencies
Xtal
XIN, XOUT : CI
120
(XS = 0)
4.332
MHz
XIN, XOUT : CI
70
(XS = 1)
8.664
MHz
Crystal oscillator frequency deviation
TXtal
XIN, XOUT : f
O
= 4.322 MHz, 8.664 MHz
100
ppm
Data setup time
t
SU
DI, CL
0.75
s
Data hold time
t
HD
DI, CL
0.75
s
Clock low-level time
t
CL
CL
0.75
s
Clock high-level time
t
CH
CL
0.75
s
CE wait time
t
EL
CE, CL
0.75
s
CE setup time
t
ES
CE, CL
0.75
s
CE hold time
t
EH
CE, CL
0.75
s
CE high-level time
t
CE
CE
20
ms
Data latch change time
t
LC
1.15
s
t
DC
DO, CL: Differs depending on the value of the
0.46
s
Data output time
pull-up resistor used.
t
DH
DO, CE: Differs depending on the value of the
0.46
s
pull-up resistor used.
Allowable Operating Ranges
at Ta = 40 to +85C, Vssd = Vssa = 0 V
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Input resistance
Rmpxin
MPXINVssa : f = 57 kHz
23
k
Rcin
CINVssa : f = 57 kHz
100
k
Internal feedback resistance
Rf
XIN
1.0
M
Center frequency
fc
FLOUT
56.5
57.0
57.5
kHz
3 dB bandwidth
BW 3 dB FLOUT
2.5
3.0
3.5
kHz
Gain
Gain
MPXINFLOOUT : f = 57 kHz
28
31
34
dB
Att1
FLOUT :
f = 7 kHz
30
dB
Stop band attenuation
Att2
FLOUT : f < 45 kHz, f > 70 kHz
40
dB
Att3
FLOUT : f < 20 kHz
50
dB
Reference voltage output
Vref
VREF : Vdda = 5 V
2.5
V
Electrical Characteristics
in the allowable operating ranges
Continued on next page.
Note: A capacitor of at least 1000 pF must be inserted between the power supply pins Vdd and Vss.
No. 5877-5/14
LC72720N, 72720NM
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Hysteresis
V
HIS
CL, DI, CE, SYR, T1, T2
0.1 Vddd
V
Output low-level voltage
V
OL
1
DO, T3, T4, T5, T6, T7 : I = 2 mA
0.4
V
V
OL
2
SYNC, RDS-ID : I = 8 mA
0.4
V
Input high-level current
I
IH
1
CL, DI, CE, SYR, T1, T2 : V
I
= 6.5 V
5.0
A
I
IH
2
XIN : V
I
= Vddd
2.0
11
A
Input low-level current
I
IL
1
CL, DI, CE, SYR, T1, T2 : V
I
= 0 V
5.0
A
I
IL
2
XIN : V
I
= 0 V
2.0
11
A
Output off leakage current
I
OFF
DO, SYNC, RDS-ID, T3, T4, T5, T6, T7 :
5.0
A
V
O
= 6.5 V
Current drain
Idd
Vddd + Vdda
12
mA
Continued from preceding page.
CCB Output Data Format
Each block of output data consists of 32 bits (4 bytes), of which 2 bytes are RDS data and 2 bytes are flag data.
Any number of 32-bit output data blocks can be output consecutively.
When there is no data that can be read out in the internal memory, the system outputs blocks of all-zero data
consecutively.
If data readout is interrupted, the next read operation starts with the 32-bit data block whose readout was interrupted.
However, if only the last bit remains to be read, it will not be possible to reread that whole block.
The check bits (10 bits) are not output.
To judge whether or not the data is valid, refer to the error information flags E0 to E2, but the offset word detection
flags (OWD) should never be reffered to.
If the first four-bits are not "1010", since the readout data is invalid, readout operation must be halted.
1. Offset word detection flag (1 bit): OWD
2. Offset word information flag (3 bits): B0 to B2
OWD
Offset word detection
1
Detected
0
Not detected (protection function operating)
B
B
B
Offset word
2
1
0
0
0
0
A
0
0
1
B
0
1
0
C
0
1
1
C'
1
0
0
D
1
0
1
E
1
1
0
Unused
1
1
1
Unused
CCB address 6C
Output data/first bit
Last bit
(8) RDS data
(7) Error information flags
(6) Synchronization established flag
(5) ARI (SK) detection flag
(4) RAM data remaining flag
(3) Consecutive RAM read out possible flag
(2) Offset word information flag
(1) Offset word detection flag
Fixed pattern (1010)
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