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AD8350AR15-REEL 데이터시트(PDF) 8 Page - Analog Devices |
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AD8350AR15-REEL 데이터시트(HTML) 8 Page - Analog Devices |
8 / 11 page REV. 0 AD8350 –8– APPLICATIONS Using the AD8350 Figure 27 shows the basic connections for operating the AD8350. A single supply in the range +5 V to +10 V is required. The power supply pin should be decoupled using a 0.1 µF capacitor. The ENBL pin is tied to the positive supply or to +5 V (when VCC = +10 V) for normal operation and should be pulled to ground to put the device in sleep mode. Both the inputs and the outputs have dc bias levels at midsupply and should be ac-coupled. Also shown, in Figure 27, are the impedance balancing require- ments, either resistive or reactive, of the input and output. With an input and output impedance of 200 Ω, the AD8350 should be driven by a 200 Ω source and loaded by a 200 Ω impedance. A reactive match can also be implemented. Figure 28 shows how the AD8350 can be driven by a single- ended source. The unused input should be ac-coupled to ground. When driven single-ended, there will be a slight imbal- ance in the differential output voltages. This will cause an in- crease in the second order harmonic distortion (at 50 MHz, with VCC = +10 V and VOUT = 1 V p-p, –59 dBc was measured for the second harmonic on AD8350-15). 8 7 6 5 1 2 3 4 AD8350 – ENBL (+5V) +VS (+5V TO +10V) C5 0.1 F C4 0.001 F C3 0.001 F LOAD Z = 200 C2 0.001 F C1 0.001 F SOURCE Z = 100 Z = 100 Figure 27. Basic Connections for Differential Drive 8 7 6 5 1 2 3 4 AD8350 – ENBL (+5V) +VS (+5V TO +10V) C5 0.1 F C4 0.001 F C3 0.001 F LOAD Z = 200 C2 0.001 F SOURCE Z = 200 C1 0.001 F Figure 28. Basic Connections for Single-Ended Drive Reactive Matching In practical applications, the AD8350 will most likely be matched using reactive matching components as shown in Figure 29. Matching components can be calculated using a Smith Chart and the AD8350’s S-Parameters (see Tables I and II) along with those of the devices that are driving and loading it. The S- Parameters in Tables I and II assume a differential source and load impedance of 50 Ω. Because the load impedance on the output of the AD8350 affects the input impedance, a simulta- neous conjugate match must be performed to correctly match both input and output. 8 7 6 5 1 2 3 4 AD8350 – ENBL (+5V) +VS (+5V TO +10V) C2 0.1 F C2 C2 C1 C1 L1 L2 Figure 29. Reactively Matching the Input and Output |
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