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SI4831-B30 Datenblatt(PDF) 10 Page - Silicon Laboratories |
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SI4831-B30 Datenblatt(HTML) 10 Page - Silicon Laboratories |
10 / 20 page Si4831/35-B30 10 Rev. 1.0 4. Functional Description Figure 2. Si4831/35-B30 Functional Block Diagram 4.1. Overview The Si4831/35-B30 is the industry's most advanced fully integrated, mechanical-tuned 100% CMOS AM/FM/SW radio receiver IC. Offering unmatched integration and PCB space savings, the Si4831/35-B30 requires minimum external components and a small board area. The Si4831/35-B30 AM/FM/SW radio provides space savings and low power consumption while delivering the high performance and design simplicity desired for all AM/FM/SW solutions. Leveraging Silicon Laboratories' proven and patented digital low intermediate frequency (low-IF) receiver architecture, the Si4831/35-B30 delivers superior 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 Si4831/35-B30 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. Refer to "AN555: Si483x-B Antenna, Schematic, Layout, and Design Guidelines." The Si4831/35-B30 also has advanced stereo blending that employs adaptive noise suppression. As a signal quality degrades, the Si4831/35-B30 gradually combines the stereo left and right audio channels to a mono audio signal to maintain optimum sound fidelity under varying reception conditions. The Si4831/35-B30 can drive a stereo light with the stereo/mono information so that the user can easily discern the signal quality. Si4830/34 ADC ADC DSP DAC DAC ROUT LOUT AFC Si4831/35 RFGND LNA AMI AGC REG VDD1/2 2.0~3.6V XTAL OSC FMI 0/90 ADC XTALI AM ANT FM/SW ANT CONTROL INTERFACE TUNE 1/2 BAND |
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