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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADPA7008 датащи(PDF) 21 Page - Analog Devices |
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ADPA7008 датащи(HTML) 21 Page - Analog Devices |
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21 / 28 page  Data Sheet ADPA7008 BIASING THE ADPA7008 WITH THE LOW NOISE LTM8063 analog.com Rev. 0 | 21 of 28 The LTM8063 is a Silent Switcher voltage regulator that meets the bias requirement for the positive drain supply of the ADPA7008. The regulator provides a drain bias voltage that is constant over load current variations. Figure 70 shows a circuit that derives the 5 V VDD supply voltage from an input rail that can vary from 6.5 V to 40 V (which is the VIN range of the LTM8063). The LTC8063 is configured using external components to generate a 5 V VDD supply capable of up to 2 A. Figure 71 shows a plot of the measured noise figure vs. frequency of this circuit with a comparison to that measured with a bench supply, for reference. Figure 70. Application Circuit Using the LTM8063 for Low Noise Drain Voltage Generation for the ADPA7008 Figure 71. ADPA7008 Noise Figure vs. Frequency Measured for VDD Using the LTM8063 vs. a Bench Supply for Reference A low current (<<1 mA) negative VGG is also required to provide the constant VGG bias voltage. For this, the ADP5600 is recommended. As previously noted, the ADPA7008 VDD and VGG voltages must be correctly sequenced during power-on and power-off. Figure 72 shows a complete circuit that includes positive drain voltage generation, negative gate voltage generation, and the pow- er-on and power-off sequencing. This circuit supports an external input voltage (VIN) range of 12 V to 16 V. |
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