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ADL5802ACPZ-R7 数据表(PDF) 26 Page - Analog Devices |
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ADL5802ACPZ-R7 数据表(HTML) 26 Page - Analog Devices |
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26 / 32 page  ADL5802 Rev. 0 | Page 26 of 32 RF1– RF1+ ADL5802 RF2– GND RF2+ C13 C14 T5 T3 C5 C12 RF1 RF2 23 22 21 20 19 Figure 69. ADL5802 RF Interface GND ENBL LOIP LOIN ADL5802 GND T1 LO C3 C2 7 8 9 10 11 Figure 70. ADL5802 LO Interface Table 4. Suggested Components for the RF and LO Interfaces RF and LO Frequency T1, T3, T5 C2, C3, C5, C12, C13, C14 900 MHz Mini-Circuits® TC1-1-13M+ 100 pF 1900 MHz Mini-Circuits TC1-1-13M+ 100 pF 2500 MHz Johanson Technology 2500BL14M050 3 pF 3500 MHz Johanson Technology 3600BL14M050 1.5 pF 5500 MHz Johanson Technology 5400BL15B050 3 pF IF PORT The IF port features an open-collector differential output interface. It is necessary to bias the open collector outputs using one of the schemes presented in Figure 71 and Figure 72. Figure 71 shows the use of center-tapped impedance transformers. The turns ratio of the transformer should be selected to provide the desired impedance transformation. In the case of a 50 Ω load impedance, a 4:1 impedance ratio transformer should be used to transform the 50 Ω load into a 200 Ω differential load at the IF output pins. Figure 72 shows a differential IF interface where pull-up choke inductors are used to bias the open-collector outputs. The shunting impedance of the choke inductors used to couple dc current into the mixer core should be large enough at the IF frequency of operation so as not to load down the output current before it reaches the intended load. Additionally, the dc current handling capability of the selected choke inductors must be at least 45 mA. The self-resonant frequency of the selected choke inductors must be higher than the intended IF frequency. A variety of suitable choke inductors is commercially available from manufacturers such as Coilcraft and Murata. An impedance transforming network may be required to transform the final load impedance to 200Ω at the IF outputs. ADL5802 IF1P C16 T4 VPOS C15 T2 IF2P VPOS ADL5802 GND OP1+ OP1– GND GND 1 2 3 4 5 OP2+ GND GND GND OP2– 18 17 16 15 14 Figure 71. Biasing the IF Port Open-Collector Outputs Using a Center-Tapped Impedance Transformer ADL5802 ADL5802 C18 L4 L3 C17 VPOS VPOS ZL IMPEDANCE TRANSFORMING NETWORK C1 L1 L2 C4 ZLOAD = 200Ω ZLOAD = 200Ω VPOS VPOS GND OP1+ OP1– GND GND 1 2 3 4 5 OP2+ GND GND GND OP2– 18 17 16 15 14 IMPEDANCE TRANSFORMING NETWORK IF2 OUT+ IF2 OUT– IF1 OUT+ IF1 OUT– ZL Figure 72. Biasing the IF Port Open-Collector Outputs Using Pull-Up Choke Inductors |
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