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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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BK4819 Fiches technique(PDF) 2 Page - Beken Corporation |
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BK4819 Fiches technique(HTML) 2 Page - Beken Corporation |
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2 / 22 page  BK4819 Rev.1.0 Copyright©2018 by Beken Corporation BK4819 1 Functional Description FSK Mod. Com press Emphasis Scrambling CTCCS PLL Modulator De- Emphasis DAC ADC Tra nsm itter Receiver Squelc h PLL Filter Demod RSSI ADC ADC MUX MUX MUX Voice Act ivate Switch De- Scrambling FSK Demod. LPF CTCCS BPF 26MHz SPI M C U AGC MIS C CDCCS SELCALL DTMF CDCCS SELCALL DTMF Expander Figure 1. Functional Block Diagram 1.1 Overview The BK4819 integrates high performance PLL, ADC, DAC, and advanced digital signal processing capability on a single chip. The digital low-IF image rejection architecture enables it to work with a very simple MCU as a two way radio communication system. On-chip flexible and precise continuous and discrete tone generator and detector enable a secure link and digital signaling. 1.2 RF Transceiver BK4819 includes an integrated RF transceiver which is compliant with the specification most country in the world. The RF transceiver requires the following external components to operate: 1) A 26MHz crystal; 2) Simple input matching and output matching; 3) Several SMD capacitors for decoupling and DC blocking. 1.2.1 FM Receiver The receiver implements a low-IF image rejection architecture, which is composed with two parts: RF front-end and IF part. The RF front-end comprises a LNA and a quadrature mixer. The IF part comprises a low-pass filter (LPF) for matching 相同 相似配对 decoupling分离 front-end 前置 comprises组成构成 |
Description similaire - BK4819 |
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