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1-chip Tuner
1-chip Tuner
1-chip Tuner
LV25300M
LV25300M
LV25300M
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
10.7 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.
Features
FM F.E
Bass control
FM IF
Switching control
AM
Automatic adjustment
PLL
Connection to LC75030W (Interface)
Block Diagram
FM antenna circuit
MIX
FM antenna sync circuit
FM RF amp circuit
COIL
CF 10.7MHz
FM-RF amp circuit
FM RF sync circuit
BPF
80
79
78
77
76
75
74
73
FE
1
2
ANT-D
FM
AM
ANT-D
1st
1st
3
MIX
MIX
RF
RF
4
Keyed
N
W
W
M AGC
AGC
AGC
AGC
AGC
5
FM
AM
6
Coil sync
OSC
Lo/DX
Lo/DX
circuit
7
PLL
8
ECT
POWER ON
9
NMOS Tr
1/4.1/6
RESET
1/8.1/10
BUS-
10
IF
swallow
IN 1
COUNTER
counter
IN 2
11
LPF
IN 3-1
6/8bit AD
P-CTR
IN 3-2
convertor
12
IN 3-3
phase
R-CTR
IN 3-4
13
det
BUS
charge
14
pump
15
Diversity
ANT selector
16
CURRENT
LOGIC
17
DRIVER
COUNTER
18
Time constant
DIVIDER
generator
19
3V REG
MAIN FIX
NOIZE AMP
CIRCUIT
20
21
22
23
24
25
26
27
28
9 Car Audio
Under
Under
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development
development
Diversity function
Package: QFP80 (14
14)
CCB is a SANYO's original bus format and all the
bus addresses are controlled by SANYO.
CF 10.7MHz
AM TRANS
CF 10.7MHz
72
71
70
69
68
67
66
65
64
63
62
61
AM-NC
60
AM bl o ck
4.9V
AM
REG
59
NC STOP
TRIG
1stAMP
NOIZE
NOIZE
58
AMP
AGC
57
SD
AM
IF AGC
56
S-METER
2ndMIX
AM demodulation
2ndIFAM
55
CF 450kHz
Low cut
Differential
Differential
54
DETECTET
amp 2
amp 1
AMP
DAC block
53
52
51
FM IF
50
DAC
FM
S-METER
CIRCUIT
Limitter
1stAMP
(DC/AC)
AMP
49
48
SD
2ndMIX
47
AUDIO
MUTE
46
DETECTOR
AFC
CIRCUIT
CIRCUIT
45
44
2.7V REG
43
450kHz
42
450kHz
XTAL
OUTPUT
OSC
41
BUFFER
29
30
31
32
33
34
35
36
37
38
39
40
XTAL 10.25MHz
Tuner/IF-DSP
LC75030W
LC75030W
LC75030W
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
AMNCT
AM/FM Detector
14bit
FM Stereo
FM/AM
ADC
de-modulator
IF Signal
Program Memory 1
10bit
SM-DC
ADC
Bus-Interface
10bit
SM-AC
ADC
MIC O
Digital
FAVOR-30
MIC P
CORE-1
Data
MIC N
Buffer
TEL O
&
TEL P
ADC
TEL N
24bit
L
Control
CHG L (BTL)
ADC1
CHG R (BTL)
ADC2
CD L (OTL)
R
PERIPHERAL Control
CD R (OTL)
Timing Control
MD L (OTL)
MD R (OTL)
AUX L (OTL)
AUX R (OTL)
R.S.E
REAR R
EVR
Selector
REAR L
EVR
NAV O
NAV P
RDS
NAV N
Digital Interface
Decoder
PLL & VCO
Receiver
IIS Digital Input
Under
Under
Under
development
development
development
Program Memory 2
TEST1
Bus-Interface
FAVOR-30
TESTn
CORE-2
DATA
Analog
Buffer
Mixing
FL
SW
EVR
DAC
(VOUT1L)
FR
SW
EVR
DAC
(VOUT1R)
RL
EVR
SW
DAC
(VOUT2L)
Buffer
RR
SW
EVR
&
DAC
(VOUT2R)
SUB Woofer
DAC
DAC
EVR
(VOUT3L)
Control
Center
DAC
EVR
(VOUT3R)
DAC
DAC
CCB Interface
BCLKO
LRCKO
FDATO
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