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SI4824-DEMO Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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SI4824-DEMO Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 20 page Si4820/24-A10 Rev. 1.0 11 4. Functional Description Figure 2. Si4820/24-A10 Functional Block Diagram 4.1. Overview The Si4820/24-A10 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 Si4820/24-A10 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 Si4820/24-A10 is drop-in replaceable to the existing Si4831/35 tuner, requires a simple application circuit, and removes any requirements for manually tuning components during the manufacturing process. It is a very simple product to design, manufacture, and support across multiple product lines. Leveraging Silicon Laboratories' proven and patented digital low intermediate frequency (low-IF) receiver architecture, the Si4820/24-A10 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 Si4820/24-A10 integrates a low noise amplifier (LNA) supporting the worldwide FM broadcast band (64 to 109 MHz). 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 Si4820/24 RFGND LNA AMI AGC REG VDD1/2 2.0~3.6V XTAL OSC FMI 0/90 AM ANT FM ANT CONTROL INTERFACE TUNE1/2 BAND XTALI ADC |
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