Sanyo EP93F manual LV25300M Under

1-chip Tuner

LV25300M Under

development

Functions

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

10.7MHz 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.

Features

■ FM F.E	■ Bass control	■ Diversity function
■ FM IF	■ Switching control	■ Package: QFP80 (14 14)
■ AM	■ Automatic adjustment
■ PLL	■ Connection to LC75030W (Interface)

											CCB is a SANYO’s original bus format and all the
Block Diagram											bus addresses are controlled by SANYO.
		FM antenna circuit
FM antenna sync circuit		FM RF amp circuit			MIX		CF 10.7MHz						CF 10.7MHz			AM TRANS			CF 10.7MHz
FM-RF amp circuit	FM RF sync circuit		BPF		COIL
	80	79	78	77	76	75	74	73	72	71	70	69	68	67	66	65	64	63	62	61

Tuner/IF-DSP

LC75030W30W UnderUnder

developmentdevelopment

Functions

The LC75030W is a DSP for car tuner/audio.

Features

■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

Features

■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)

Block Diagram

FE

1

4.9V

AMblock

AM-NC

60

2

ANT-D

ANT-D

AM

59

FM

AM

REG

NC STOP

TRIG

1stAMP

3

1st

1st

58

MIX

MIX

NOIZE

NOIZE

4

RF

RF

AMP

AGC

57

Keyed

N

W

W

M AGC

SD

5

AGC

AGC AGC

AGC

IF AGC

AM

56

S-METER

2ndMIX

Coil sync

6

OSC

FM

AM

AM demodulation

2ndIFAM

55

CF 450kHz

Lo/DX

Lo/DX

circuit

7

Low cut

Differential

Differential

54

DETECTET

8

PLL

DAC block

AMP

amp 2

amp 1

53

9

ECT

POWER ON

52

NMOS Tr

1/4.1/6

RESET

10

1/8.1/10

BUS-

51

swallow

IF

IN 1

FM IF

11

counter

COUNTER

IN 2

50

LPF

DAC

6/8bit AD

IN 3-1

FM

S-METER

Limitter

P-CTR

CIRCUIT

IN 3-2

12

convertor

1stAMP

(DC/AC)

AMP

49

phase

IN 3-3

13

R-CTR

IN 3-4

SD

48

det

2ndMIX

BUS

charge

14

47

pump

15

Diversity

AFC

AUDIO

MUTE

DETECTOR

46

CIRCUIT

CIRCUIT

16

ANT selector

45

CURRENT

LOGIC

17

DRIVER

44

2.7V REG

18

COUNTER

43

Time constant

DIVIDER

generator

450kHz

19

3V REG

42

MAIN FIX

XTAL

450kHz

NOIZE AMP

OUTPUT

20

CIRCUIT

OSC

41

BUFFER

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

XTAL 10.25MHz

AMNCT
FM/AM
IF Signal
SM-DC
SM-AC
MIC O
MIC P
MIC N
TEL O
TEL P
TEL N
CHG L (BTL)	SelectorInputADC ControlGain
CHG R (BTL)
CD L (OTL)
CD R (OTL)
MD L (OTL)
MD R (OTL)
AUX L (OTL)
AUX R (OTL)
REAR R	EVR
REAR L	EVR

NAV O

NAV P

NAV N

14bit	AM/FM Detector
ADC	FM Stereo
	de-modulator	Program Memory 1	Program Memory 2

10bit
ADC			Bus-Interface		Bus-Interface				TEST1
10bit								TEST
				RAM		RAM
ADC
		Digital	FAVOR-30	Data	FAVOR-30	Data			TESTn
		Data	CORE-1		CORE-2
		Buffer
		&
24bit		ADC		DATA			Analog
	L	Control
ADC1				Buffer			Mixing
									FL
						DAC	SW	EVR
ADC2	R		PERIPHERAL Control						(VOUT1L)
						DAC	SW	EVR	FR
			Timing Control						(VOUT1R)
						DAC	SW	EVR	RL
					Buffer				(VOUT2L)
						DAC	SW	EVR	RR
					&				(VOUT2R)
					DAC	DAC	EVR		SUB Woofer
R.S.E					Control				(VOUT3L)
									Center
Selector						DAC	EVR
									(VOUT3R)
						DAC
RDS						DAC
			Digital Interface
Decoder					CCB Interface
		PLL & VCO	Receiver						BCLKO
			IIS Digital Input						LRCKO
									FDATO

RDS ID RDS D RDS C XOUT XIN VCO PDO DIR MD DIR CD DIR AUX IIS CLK IIS IN IIS WS CE CL DI DO BUSY PWDB RSTB

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