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ADL5331 データシート(PDF) 9 Page - Analog Devices |
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ADL5331 データシート(HTML) 9 Page - Analog Devices |
9 / 15 page Data Sheet ADL5331 Rev. A | Page 9 of 15 APPLICATIONS INFORMATION ADL5331 VPS1 COM1 INHI INLO COM1 VPS1 VPS2 COM2 OPHI OPLO COM2 VPS2 C7 100pF L1 0.68µH L2 0.68µH C5 10nF C6 10nF C13 10nF C14 10nF C9 10nF C10 10nF C8 0.1µF C1 0.1µF C16 100pF C15 0.1µF C11 100pF C12 0.1µF C2 100pF C3 0.1µF C4 100pF VPOS RFOUT VPOS VPOS RFIN VPOS VPOS GAIN Figure 15. Basic Connections BASIC CONNECTIONS Figure 15 shows the basic connections for operating the ADL5331. There are two positive supplies, VPS1 and VPS2, which must be connected to the same potential. Connect COM1 and COM2 (common pins) to a low impedance ground plane. Apply a power supply voltage between 4.75 V and 5.25 V to VPS1 and VPS2. Connect decoupling capacitors with 100 pF and 0.1 µF power supplies close to each power supply pin. The VPS2 pins (Pins 13 and Pin 18 through Pin 22) can share a pair of decoupling capacitors because of their proximity to each other. The outputs of the ADL5331, OPHI and OPLO, are open collectors that need to be pulled up to the positive supply with 120 nH RF chokes. The ac-coupling capacitors and the RF chokes are the principle limitations for operation at low frequencies. For example, to operate down to 1 MHz, use 0.1 µF ac coupling capacitors and 1.5 µH RF chokes. Note that in some circumstances, the use of substantially larger inductor values results in oscillations. Because the differential outputs are biased to the positive supply, ac-coupling capacitors (preferably 100 pF) are needed between the ADL5331 outputs and the next stage in the system. Similarly, the INHI and INLO input pins are at bias voltages of about 3.3 V above ground. The nominal input and output impedance looking into each individual RF input/output pin is 25 Ω. Consequently, the differential impedance is 50 Ω. To enable the ADL5331, the ENBL pin must be pulled high. Taking ENBL low puts the ADL5331 in sleep mode, reducing current consumption to 250 µA at an ambient temperature. The voltage on ENBL must be greater than 1.7 V to enable the device. When enabled, the device draws 100 mA at low gain to 215 mA at maximum gain. The ADL5331 is primarily designed for differential signals; however, there are several configurations that can be imple- mented to interface the ADL5331 to single-ended applications. Figure 16 and Figure 17 show options for differential-to-single- ended interfaces. Both configurations use ac-coupling capacitors at the input/output and RF chokes at the output. RFIN 10nF 10nF INHI INLO RFOUT 10nF 10nF OPHI OPLO ADL5331 RF VGA 120nH 120nH +5V ETC1-1-13 ETC1-1-13 Figure 16. Differential Operation with Balun Transformers Figure 16 illustrates differential balance at the input and output using a transformer balun. Input and output baluns are recom- mended for optimal performance. Much of the characterization for the ADL5331 was completed using 1:1 baluns at the input and output for a single-ended 50 Ω match. Operation using M/A-COM ETC1-1-13 transmission line transformer baluns is recommended for a broadband interface; however, narrow- band baluns can be used for applications requiring lower insertion loss over smaller bandwidths. |
同様の部品番号 - ADL5331_17 |
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同様の説明 - ADL5331_17 |
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