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ST7538Q 데이터시트(PDF) 25 Page - STMicroelectronics |
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ST7538Q 데이터시트(HTML) 25 Page - STMicroelectronics |
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25 / 44 page ![]() ST7538Q Functional description 25/44 Figure 11. CD_PD timing during RX Figure 12. Receiving path block diagram TDCD TCD CD_PD RAI D03IN1418 TDCD TCD RxD (UART/SPI="1") demodulation active on RxD pin RxD (UART/SPI="0") noise demodulated noise demodulated Low Pass Band Pass PRE-FILTER IF FILTER FSK DEMODULATOR DIGITAL FILTER MIXER CARRIER/ PREAMBLE DETECTION AGC GAIN CONTROL LOCAL OSC 32 Bit 23 Bits 0 -2 Bits 3-4 &14 Bits 0-2 RAI Bits 9-10 Bits 12-13 & 22 Carrier Detection 3 RxD 8 CLR/T 1 CD_PD 9 BU PLL Bits 3-4 Low Pass BAND IN USE Bits 3-4 & 22 Band Pass CHANNEL FILTER Band Pass D03IN1419 HEADER RECOGN. Bits 18-21 & 24-47 RXFO 31 |
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