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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7580 датащи(PDF) 19 Page - STMicroelectronics |
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ST7580 датащи(HTML) 19 Page - STMicroelectronics |
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19 / 33 page  DocID022644 Rev 2 19/33 ST7580 Power management 33 6 Power management Figure 8 shows the power supply structure for the ST7580. The ST7580 operates from two external supply voltages: VCC (8 to 18 V) for the power amplifier and the analog section VDDIO (3.3 or 5 V) for interface lines and digital blocks. Two internal linear regulators provide the remaining required voltages: 5 V analog front-end supply: generated from the VCC voltage and connected to the VCCA pin 1.8 V digital core supply: generated from the VDDIO voltage and connected to VDD_REG_1V8 (direct regulator output) and VDD pins. The VDD_PLL pin, supplying the internal clock PLL, must be externally connected to VDD through a ferrite bead for noise filtering purposes. All supply voltages must be properly filtered to their respective ground, using external capacitors close to each supply pin, in accordance with the supply scheme depicted in Figure 8 . Note that the internal regulators connected to VDD_REG_1V8 and to VCCA are not designed to supply external circuitry; their outputs are externally accessible for filtering purposes only. External connections between all VDD pins are not required. |
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