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ADL5812ACPZ-R7 数据表(PDF) 22 Page - Analog Devices |
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ADL5812ACPZ-R7 数据表(HTML) 22 Page - Analog Devices |
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22 / 28 page  ADL5812 Rev. 0 | Page 22 of 28 APPLICATIONS INFORMATION BASIC CONNECTIONS The ADL5812 mixer is designed to downconvert radio frequencies (RF) primarily between 700 MHz and 2800 MHz to lower intermediate frequencies (IF) between 30 MHz and 450 MHz. Figure 60 depicts the basic connections of the mixer. It is recommended to ac couple RF and LO input ports to prevent nonzero dc voltages from damaging the RF balun or LO input circuit. A RFIN capacitor value of 22 pF is recommended. IF PORT The mixer differential IF interface requires pull-up choke inductors to bias the open-collector outputs and to set the output match. The shunting impedance of the choke inductors used to couple dc current into the IF amplifier should be selected to provide the desired output return loss. The real part of the output impedance is approximately 200 Ω, as seen in Figure 31, which matches many commonly used SAW filters without the need for a transformer. This results in a voltage conversion gain that is approximately 6 dB higher than the power conversion gain. When a 50 Ω output impedance is needed, use a 4:1 impedance transformer, as shown in Figure 60. BIAS RESISTOR SELECTION External resistors, R1 and R2, are used to adjust the bias current of the integrated amplifier at the IF terminal. It is necessary to have a sufficient amount of current to bias both the internal IF amplifier to optimize dc current vs. optimum input IP3 performance. Figure 42 and Figure 43 provide the reference for the bias resistor selection when lower power consumption is considered at the expense of conversion gain and input IP3 performance. VCC RED BLK VPOS AGND C25 22pF C24 22pF RFIN2 C17 22pF RFIN2 C6 22pF RFIN1 30 29 28 27 26 25 24 23 22 21 1 PAD VCC VCC VCC VCC C3 120pF C4 120pF C2 0.1µF C13 10pF VCC C14 10pF C12 10pF C11 10pF C5 120pF C8 0.1µF C7 22pF C2.3 10pF 3 4 6 2 1 C1 0.1µF IFON IFOP R20 OPEN R21 0Ω R1 910Ω T1 TC4-1W+ L1 470nH L2 470nH VCC VCC VCC VCC VCC C3 120pF C4 120pF C27 0.1µF C20 10pF C19 10pF C18 10pF C16 22pF C15 10pF C30 120pF 3 4 6 2 1 C26 0.1µF IFON IFOP R23 OPEN R22 0Ω R2 910Ω T1 TC4-1W+ L3 470nH L4 470nH RF1 RFCT1 NC NC NC NC NC NC RFCT2 RF2 V1LO1 NC NC NC LOIP LOIN LE DATA CLK LE DATA CLK V2LO1 ADL5812 2 3 4 5 6 7 8 9 10 Figure 60. Evaluation Board Schematic |
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