![](/images/new-backgrounds/1179633/17963313x1.webp)
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 sync circuit | BPF |
| COIL |
|
|
| ||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
| 80 | 79 | 78 | 77 | 76 | 75 | 74 | 73 | 72 | 71 | 70 | 69 | 68 | 67 | 66 | 65 | 64 | 63 | 62 | 61 |
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
■
■Waveform interpolation processing using two noise detection circuit and software systems
■DSP software for optimum tuning, standardization, and
■Analog output pin for dedicated rear sheet output that is independent of
■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 |
|
|
|
|
| 60 |
| ||
| 2 |
|
|
|
|
|
|
|
|
| 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 |
| |||||||
|
|
|
|
|
|
|
|
|
|
| ||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 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 |
|
|
|
|
|
| FM |
|
| Limitter |
| ||||||||
|
|
|
|
|
| CIRCUIT |
|
|
|
|
|
| ||||||||||||
|
|
|
| IN |
|
|
|
|
|
|
|
| ||||||||||||
| 12 |
| convertor |
|
|
|
|
|
|
| 1stAMP | (DC/AC) |
|
| AMP | 49 |
| |||||||
| phase |
|
| IN |
|
|
|
|
|
|
|
|
| |||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |||
| 13 |
|
| IN |
|
|
|
|
|
|
|
|
| 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 |
| |
|
| |
|
| |
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 |
|
|
|
Program Memory 1 |
| Program Memory 2 | ||
|
| |||
|
|
|
10bit |
|
|
|
|
|
|
|
|
|
ADC |
|
|
|
|
|
| TEST1 | ||
10bit |
|
|
|
|
| TEST | |||
|
|
| RAM |
| RAM |
|
| ||
ADC |
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
| |
|
| Digital | Data | Data |
|
| TESTn | ||
|
| Data |
|
|
| ||||
|
|
|
|
|
|
| |||
|
| 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 |
| 9 Car Audio | 10 Car Audio |
|
|
|