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AT86RF231-ZF Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT86RF231-ZF Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 198 page  10 8111C–MCU Wireless–09/09 AT86RF231 4. General Circuit Description This single-chip radio transceiver provides a complete radio transceiver interface between an antenna and a microcontroller. It comprises the analog radio, digital modulation and demodula- tion including time and frequency synchronization and data buffering. The number of external components is minimized such that only the antenna, the crystal and decoupling capacitors are required. The bidirectional differential antenna pins (RFP, RFN) are used for transmission and reception, thus no external antenna switch is needed. The AT86RF231 block diagram is shown in Figure 4-1 on page 10. Figure 4-1. AT86RF231 Block Diagram The received RF signal at pins RFN and RFP is differentially fed through the low-noise amplifier (LNA) to the RF filter (PPF) to generate a complex signal, driving the integrated channel filter (BPF). The limiting amplifier provides sufficient gain to drive the succeeding analog-to-digital converter (ADC) and generates a digital RSSI signal. The ADC output signal is sampled by the digital base band receiver (RX BBP). The transmit modulation scheme is offset-QPSK (O-QPSK) with half-sine pulse shaping and 32- length block coding (spreading) according to [1] and [2]. The modulation signal is generated in the digital transmitter (TX BBP) and applied to the fractional-N frequency synthesis (PLL), to ensure the coherent phase modulation required for demodulation of O-QPSK signals. The fre- quency-modulated signal is fed to the power amplifier (PA). A differential pin pair DIG3/DIG4 can be enabled to control an external RF front-end. Two on-chip low-dropout voltage regulators (A|DVREG) provide the analog and digital 1.8V supply. AVREG LNA PLL PA PPF BPF Limiter ADC AGC ext. PA and Power Control Configuration Registers SPI (Slave) RSSI IRQ CLKM /RST SLP_TR /SEL MISO MOSI SCLK DIG3/4 RFP RFN TX Data Control Logic DIG2 Antenna Diversity FTN, BATMON XOSC Analog Domain Digital Domain AES DIG1/2 AD DVREG RX BBP Frame Buffer TX BBP |
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