SANYO LC72708E Datasheet

Overview

The LC72708E is a data demodulation IC for receiving
FM multiplex broadcasts for mobile receivers in the
DARC format. The LC72708E also includes a built-in
decoder circuit that performs VICS data processing. This
allows this IC to implement compact high-functionality
VICS reception systems. Note that a contract with VICS
Center is required to evaluate samples of this IC or to
mass produce products that support the VICS system.

Functions

• SCF-based adjustment-free 76-kHz bandpass filter

• VICS decoder circuit

• MSK delay detection circuit based on a 1T delay

• Error correction function based on a 2T delay (in the
MSK detector stage)

• Digital PLL based clock regeneration circuit

• Shift-register type 1T and 2T delay circuits

• Block and frame synchronization detection circuit

• Function for setting the number of allowable BIC errors,
the number of synchronization protection.

• Error correction using (272, 190) codes

• Layer 4 CRC code checking circuit

• On-chip frame memory and memory control circuit for
vertical correction

• 7.2-MHz crystal oscillator circuit

• Two power saving functions (Standby and EC stop)

Package Dimensions

unit: mm

3148-QIP44MA

CMOS IC

71598RM (OT) No. 5875-1/15

SANYO: QIP44MA

[LC72708E]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

FM Multiplex Broadcast Reception IC

for Mobile VICS Systems

LC72708E

Ordering number : EN5875

• 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.

No. 5875-2/15

LC72708E

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

DD

max –0.3 to +7.0 V

Input voltage

V

IN

1 CE, CL, DI, RST, STNBY –0.3 to +7.0 V

V

IN

2 Pins other than VIN1 –0.3 to VDD+0.3 V

Output voltage

V

OUT

1 DO –0.3 to +7.0 V

V

OUT

2 Pins other than V

OUT

1 –0.3 to VDD+0.3 V

Output current I

OUT

BLOCK, FLOCK, BCK, FCK, DO 0 to 4.0 mA
Allowable power dissipation Pd max 250 mW
Operating temperature Topr Ta ≤ 85°C –40 to +85 °C
Storage temperature Tstg –55 to +125 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C, VSS= 0 V

Parameter Symbol Conditions

Ratings

Unit

min typ max

Supply voltage V

DD

4.5 5.5 V

Input high-level voltage V

IH

CL, CE, DI, RST, STNBY 0.7 V

DD

5.5 V

Input low-level voltage V

IL

CL, CE, DI, RST, STNBY V

SS

0.3 V

DD

V

Oscillator frequency F

OSC

This IC operates at frequencies within a

7.2 MHz

±250 ppm precision

Input sensitivity V

XI

With a capacitance-coupled sine wave input

400 1500 mVrms

to X

IN

Input amplitude V

MPX

MPXIN, 100% modulation composite 150 500 mVrms

[Serial I/O*]

Clock low-level time t

CL

CL 0.7 µs

Clock high-level time t

CH

CL 0.7 µs

Data setup time t

SU

CL, DI 0.7 µs

Data hold time t

HD

CL, DI 0.7 µs

CE wait time t

EL

CL, CE 0.7 µs

CE setup time t

ES

CL, CE 0.7 µs

CE hold time t

EH

CL, CE 0.7 µs

Data latch change time t

LC

CE 0.7 µs

Data output time t

DD0

DO, CL 277 555 ns

Layer 4 CRC change time t

CRC

CRC4, CL 0.7 µs

Allowable Operating Ranges at Ta = –40 to +80°C, VSS= 0 V

Note *: See the serial data timing chart.

Parameter Symbol Conditions

Ratings

Unit

min typ max

Output high-level voltage V

OH

1

I

O

= 2 mA, BCK, FCK, BLOCK, FLOCK,

V

DD

– 0.4 V

CRC4, INT, CLK16, DATA, IC1, IC2

Output low-level voltage

V

OL

1 IO= 2 mA, applies to the same pins as VOH1 0.4 V

V

OL

2 IO= 2 mA, DO 0.4 V

Input high-level current

I

IH

1 VIN= 5.5 V, CE, CL, DI, RST, STNBY 1.0 µA

I

IH

2 VIN= VDDD, input pins other than IIH1 1.0 µA

Input low-level current I

IL

VIN= VSSD, CL, CE, DI, RST, STNBY,

–1.0 µA

TP0 to TP8, TPC1 to 2, TOSEL1 to 2, TEST

Input resistance R

MPX

MPXIN-Vssa, f = 0 to 100 kHz 50 kΩ

Reference supply voltage output V

REFVREF

, Vdda = 5 V 2.5 V

Bandpass filter center frequency F

C

FLOOUT 76.0 kHz

–3 dB bandwidth F

BW

FLOUT 19.0 kHz

In-band delay time difference D

GD

FLOUT ±5 µs

Gain Gain MPXIN-FLOUT, f = 76 kHz 20 dB

ATT1 FLOUT, f = 50 kHz 25 dB

Stop band attenuation

ATT2 FLOUT, f = 100 kHz 15 dB
ATT3 FLOUT, f = 30 kHz 50 dB
ATT4 FLOUT, f = 150 kHz 50 dB

Electrical Characteristics at VDD= 4.5 to 5.5 V, in the allowable operating ranges

Continued on next page.

No. 5875-3/15

LC72708E

Block Diagram

Pin Assignment

1T delay

Synchronization

regeneration

PN

decoding

Output control

(CPU interface)

Antialiasing

filter

VICS processing

circuit

Timing
control

Memory array

Error

correction

Layer 2

CRC

Data

Address

Layer 4 CRC

2T delay

Clock

regeneration

MSK

correction

Parameter Symbol Conditions

Ratings

Unit

min typ max

Output off leakage current I

OFFVO

= VDDD, DO 5 µA

Hysteresis voltage V

HIS

CL, CE, DI, RST, STNBY 0.1 V

DD

V

Internal feedback resistor R

f

XIN, X

OUT

1.0 MΩ

Current drain I

DD

18 25 mA

Continued from preceding page.

No. 5875-4/15

LC72708E

Pin Descriptions

Pin No. Pin Name Function I/O Circuit type

CL
CE

DI

RST

STNBY

TEST

28
29
30
33
32
40

CCB serial interface Clock input

Data control input

Data input
System reset input (active low)
Standby mode (active high)
Test (Must be connected to ground during normal operation.)

Input

Input

TP0
TP1
TP2
TP3
TP4
TP5
TP6
TP7

TP8
TPC1
TPC2

TOSEL1
TOSEL2

9
12
13
14
15
16
17
18
19
41
42

5

6

Must be connected to either V

DD

or VSS.

Output

Output

CLK16

DATA

FCK

BCK
FLOCK
BLOCK

CRC4

INT

7

8
20
21
22
25
26
27

Clock regeneration monitor
Demodulated data monitor
Frame start signal output
Block start signal output
Outputs a high level during frame synchronization.
Outputs a high level during block synchronization.
Layer 4 CRCC check result output

External CPU interrupt signal
IC1
IC2

3
4

Internal connections. These pins must be left open.

DO31 Data output used by the CCB serial interface

Input

Output

XIN

XOUT

44

1

System clock generation crystal oscillator element connections

InputMPXIN36 Baseband (multiplex) signal input

OutputFLOUT38 Subcarrier output (76-kHz filter output)

InputCIN39 Subcarrier input (comparator input)

Continued on next page.

Data I/O Techniques

• CCB Technique
Sanyo audio ICs input and output data using the Sanyo CCB (computer control bus) standard, which is a serial bus
format. This IC uses an 8-bit address CCB and uses the following addresses.

• Data Input Timing

No. 5875-5/15

LC72708E

I/O mode

Address

Function

B0 B1 B2 B3 A0 A1 A2 A3

Input 0 1 0 1 1 1 1 1 16-bit control data input

Output 1 1 0 1 1 1 1 1 Data output for the input clock (CL)

Input 0 0 1 1 1 1 1 1 Data input (in 8-bit units) for the layer 4 CRC check circuit

• Data Output Timing

Note:The DO pin is normally left open.

Since the DO pin is an n-channel open drain pin, the time required for the data to change from the low level to the high level depends on the value of
the pull-up resistor.

Internal data latching

Continued from preceding page.

Note: A capacitor of at least 2000 pF must be inserted between VDDD and VSSD when using this IC.

Pin No. Pin Name Function I/O Circuit type

V

REF

35 Reference voltage output (Vdda/2) Output

VDDA
V

SS

A

V

DD

D

V

SS

D

37

34
2, 10, 24
11,23, 43

Analog system power supply
Analog system ground
Digital system power supply (4.5 to 5.5 V)
Digital system ground

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