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MRF89XA 数据表(PDF) 14 Page - Microchip Technology |
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MRF89XA 数据表(HTML) 14 Page - Microchip Technology |
14 / 140 page MRF89XA DS70000622D-page 14 Preliminary 2010-2017 Microchip Technology Inc. 2.1 Power Supply and Ground Block Pins To provide stable sensitivity and linearity characteristics over a wide supply range, the MRF89XA is internally voltage regulated. This internal regulated power supply block structure is illustrated in Figure 2-2. The power supply bypassing is essential for better handling of signal surges and noise in the power line. To ensure correct operation of the regulator circuit, the decoupling capacitor connection (shown in Figure 2-2) is recommended. These decoupling components are recommended for any design. The power supply block generates four regulated supplies for the analog, digital, VCO, and the PLL blocks to reduce the voltages for their specific requirements. However, Power-on Reset (POR), Configuration registers, and the SPI use the VDD supply given to the MRF89XA. The large value decoupling capacitors should be placed at the PCB power input. The smaller value decoupling capacitors should be placed at every power point of the device and at bias points for the RF port. Poor bypassing can lead to conducted interference, which can cause noise and spurious signals to couple into the RF sections, thereby significantly reducing the performance. It is recommended that the VDD pin have two bypass capacitors to ensure sufficient bypass and decoupling. However, based on the selected carrier frequency, the bypass capacitor values vary. The trace length (VDD pin to bypass capacitors) should be made as short as possible. FIGURE 2-2: POWER SUPPLY BLOCK DIAGRAM TABLE 2-2: POWER SUPPLY PIN DETAILS Blocks Biasing Through Associated Pins Regulated Voltage (in Volts) POR, SPI and Configuration Registers VDD VDD 2.1–3.6 Regulated Supply (VINTS)VDD VDD 1.4 Analog VINTS AVRS 1.0 Digital VINTS DVRS 1.0 VCO VINTS VCORS 0.85 PA VDD PARS 1.8 VDD – Pin 26 2.1 – 3.6V External Supply Internal Regulator 1.4 V Digital Regulator 1.0 V VCO Regulator 0.85 V PA Regulator 1.80 V VCORS Pin 3 PARS Pin 29 Biasing: - PA Driver - Ext. PA Choke Biasing: - VCO Circuit - Ext. VCO Tank Biasing Digital Blocks DVRS Pin 28 Biasing Analog Blocks AVRS Pin 27 Analog Regulator 1.0 V Biasing: - SPI - Config. Registers - POR 1 µF Y5V 1 µF Y5V 0.22 µF X7R 0.1 µF X7R 0.047 µF X7R VBAT VINTS |
类似零件编号 - MRF89XA |
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类似说明 - MRF89XA |
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