Sanyo EP93F - page 7

LV25300MLV25300MLV25300M

LC75030W

BPF

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MIX

COIL CF 10.7MHz CF 10.7MHz AM TRANS CF 10.7MHz

AM-NC

NC STOP TRIG

NOIZE

AGC

NOIZE

AMP

2ndMIX

IF AGC

S-METER

2ndIFAM

DETECTET

1stAMP

Low cut

AMP

Limitter

AMP

S-METER

(DC/AC)

FM IF

1stAMP

SD 2ndMIX

DETECTOR

MUTE

CIRCUIT

AUDIO

CIRCUIT

AFC

2.7V REG

450kHz

CF 450kHz

450kHz

OUTPUT

BUFFER

XTAL 10.25MHz

XTAL

OSC

3V REG

LOGIC

DIVIDER

NOIZE AMP

MAIN FIX

CIRCUIT

COUNTER

CURRENT

DRIVER

ANT selector

Diversity

charge

pump

R-CTR BUS

IN 1

IN 2

IN 3-1

IN 3-2

IN 3-3

IN 3-4

BUS-

6/8bit AD

convertor

COUNTER

ECT

1/4.1/6

1/8.1/10

NMOS Tr

swallow

counter

P-CTR

phase

det

PLL

POWER ON

RESET

DAC

CIRCUIT

Lo/DX

M AGC

AGC

Lo/DX

OSC

LPF

ANT-D

RF RF

Keyed

AGC N

AGC W

AGC

ANT-D

1st

MIX

1st

MIX

4.9V

REG

AMNCT

TEST1

TESTn

(VOUT1L)

(VOUT1R)

(VOUT2L)

(VOUT2R)

SUB Woofer

(VOUT3L)

Center

(VOUT3R)

BCLKO

LRCKO

FDATO

RSTB

PWDB

BUSY

IIS WS

IIS IN

IIS CLK

DIR AUX

DIR CD

DIR MD

PDO

VCO

XIN

XOUT

RDS_C

RDS_D

RDS_ID

SM-DC

SM-AC

MIC O

MIC P

MIC N

TEL O

TEL P

TEL N

CHG L (BTL)

CHG R (BTL)

CD L (OTL)

CD R (OTL)

MD L (OTL)

MD R (OTL)

AUX L (OTL)

AUX R (OTL)

REAR R

REAR L

NAV O

NAV P

NAV N

FM/AM

IF Signal

14bit

ADC

10bit

ADC

10bit

ADC

AM/FM Detector

FM Stereo

de-modulator

Digital

Data

Buffer

ADC

Control

24bit

ADC1L

ADC2R

R.S.E

Selector

RDS

Decoder

EVR

ADC Input Selector

Gain Control

PLL & VCO

FAVOR-30

CORE-1

Program Memory 1

Bus-Interface

FAVOR-30

CORE-2

Program Memory 2

Bus-Interface

DATA

Buffer

Data RAM

PERIPHERAL Control

Timing Control

Digital Interface

Receiver

IIS Digital Input CCB Interface

DAC EVR

DAC

EVR

Buffer

DAC

Control

Analog

Mixing

TEST

9 Car Audio 10 Car Audio

Features

Block DiagramBlock Diagram

Features

Tuner/IF-DSP

■ FM F.E

■ FM IF

■ AM

■ PLL

■ Bass control

■ Switching control

■ Automatic adjustment

■ Connection to LC75030W (Interface)

■ Diversity function

■ Package: QFP80 (14 14)

■ IF signal input (450 kHz)

■ Processing for variable IF filter bandwidth

■ FM/AM demodulation processing, noise cancellation processing

■ FM stereo demodulation

■ RDS data demodulation circuit

■ Analog source selector and ADC

■ Electronic volume

■ DAC: 6 channels

■ Interrupt voice mixing

■ High-accuracy adjacent station detection algorithm and variable IF bandwidth filter

■ Waveform interpolation processing using two noise detection circuit and software systems

■ DSP software for optimum tuning, standardization, and adjustment-free operation

■ Analog output pin for dedicated rear sheet output that is independent of 6-channel DAC

■ Realization of low power consumption through optimized design of tuner circuit and DSP software

■ Package: SQFP144 (20 20)

The LC75030W is a DSP for car tuner

audio

1-chip Tuner 1-chip Tuner

1-chip Tuner

FM antenna sync circuit

FM-RF amp circuit

Differential

amp 1

Differential

amp 2

AM demodulation

FM antenna circuit

DAC block

AM block

FM RF amp circuit

FM RF sync circuit

Time constant

generator

Coil sync

circuit

Under

development

Under

development Under

Under

development

Under

development

CCB is a SANYO’s ori

inal bus format and all the

bus addresses are controlled by SANYO.

The LV25300M is a tuning system that supports the LC75030W (SANYO audio DSP) that allows the creation of standard

tuner modules. Various setting changes can be performed with the software of the control microcontroller according to the

intended application, making the LV25300M ideal for combined use with the LC75030W. Small tuner modules can be

developed with a smaller number of parts compared to conventional tuners and at a lower total cost. Since the LV25300M

has a serial bus (CCB SANYO bus), the number of communication lines with the microcontroller is reduced by 4 and line

routing problems during set production can be avoided, making a smaller board size possible. AM/FM wave demodulation

is done through digital processing by outputting the IF signal (450 kHz) of the LV25300M to the LC75030W.

Since the LC75030W has a function to change the IF selectivity according to the level of adjacent interference, just two

10.7 MHz ceramic filters suffice to achieve both high sound quality and adjacent interference, which used to be difficult until

now because these are somewhat mutually exclusive characteristics. Moreover, the LV25300M comes with an antenna

switching diversity function that switches two antennas in response to various electric field changes during operation, a

malfunction prevention circuit that operates through antenna switching frequency detection, and a weak electric field

detection and antenna fixing circuit that uses S meter voltage, making stable reception possible.

Optimum tuner reception is possible by outputting the voltages of the LV25300M' S meter output and the AM/FM IF outputs

to a DSP and judging the radio wave status in real time, and performance combinations and specification differentiation can

be performed by software.