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

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

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