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SI4825-A10-CS Fiches technique(PDF) 11 Page - Silicon Laboratories |
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SI4825-A10-CS Fiches technique(HTML) 11 Page - Silicon Laboratories |
11 / 21 page Si4825-A10 Rev. 1.0 11 4. Functional Description Figure 2. Si4825 Functional Block Diagram 4.1. Overview The Si4825 is the entry level mechanical-tuned digital CMOS AM/FM/SW radio receiver IC that integrates the complete receiver function from antenna input to audio output. The Si4825 extends Silicon Laboratories multi- band tuner family, and further increases the ease and attractiveness of design radio reception to audio devices through small size and board area, minimum component count, and superior, proven performance. The Si4825 requires a simple application circuit, and removes any requirements for manually tuning components during the manufacturing process. Leveraging Silicon Laboratories' proven and patented digital low intermediate frequency (low-IF) receiver architecture, the Si4825 delivers desired RF performance and interference rejection in AM, FM, and SW bands. The high integration and complete system production test simplifies design-in, increases system quality, and improves manufacturability. 4.2. FM Receiver The Si4825 integrates a low noise amplifier (LNA) supporting the worldwide FM broadcast band (64 to 109 MHz) and the TV audio stations within the frequency range in China area are also supported. Pre-emphasis and de-emphasis is a technique used by FM broadcasters to improve the signal-to-noise ratio of FM receivers by reducing the effects of high frequency interference and noise. When the FM signal is transmitted, a pre-emphasis filter is applied to accentuate the high audio frequencies. All FM receivers incorporate a de-emphasis filter which attenuates high frequencies to restore a flat frequency response. Two time constants are used in various regions. The de- emphasis time constant can be chosen to be 50 or 75 µs. Si4830/34 ADC ADC DSP DAC AOUT AFC Si4825 RFGND LNA AMI AGC REG VDD 2.0~3.6V XTAL OSC FMI 0/90 AM ANT FM ANT CONTROL INTERFACE TUNE1/2 BAND XTALI ADC |
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Description similaire - SI4825-A10-CS |
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