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AD831 数据表(PDF) 10 Page - Analog Devices |
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AD831 数据表(HTML) 10 Page - Analog Devices |
10 / 16 page AD831 –10– AD831 –11– The RF input to the AD831 is shown connected by an impedance matching network for an assumed source impedance of 50 . TPC 15 shows the input impedance of the AD831 plotted vs. frequency. The input circuit can be modeled as a resistance in parallel with a capacitance. The 82 pF capacitors (CF) connected from IFN and IFP to VP provide a low-pass filter with a cutoff frequency of approximately 140 MHz in down-conversion appli- cations (see the Theory of Operation section for more details). The LO input is connected single-ended because the limiting amplifier provides a symmetric drive to the mixer. To minimize intermodulation distortion, connect pins OUT and VFB by the shortest possible path. The connections shown are for unity-gain operation. At LO frequencies less than 100 MHz, the AD831’s LO power may be as low as –20 dBm for satisfactory operation. Above 100 MHz, the specified LO power of –10 dBm must be used. �� ������ �� ��� �� �� ��� ����� ����� ��� ����� ��� ��� ����� ��� ����� �� �� �� �� ����� �� ���� �� ���� ����� ��� ��� �� ��� �� ��� �� ��� ��� �� �� ��� ��� �� ��� ���� �� � � � � � � �� �� �� �� �� ��� ��� ��� �� �� �� �� �� � � � �� �� �������� ������� ��� ��� ����� ����� ���� ����� �������� Figure 9. Connections for ±5 V Dual-Supply Operation Showing Impedance Matching Network and Gain of 2 for Driving Reverse-Terminated IF Filter APPLICATIONS Careful component selection, circuit layout, power supply dc coupling, and shielding are needed to minimize the AD831’s susceptibility to interference from radio and TV stations, etc. In bench evaluation, we recommend placing all of the components in a shielded box and using feedthrough decoupling networks for the supply voltage. Circuit layout and construction are also critical, since stray capaci- tances and lead inductances can form resonant circuits and are a potential source of circuit peaking, oscillation, or both. Dual-Supply Operation Figure 9 shows the connections for dual-supply operation. Supplies may be as low as ±4.5 V but should be no higher than ±5.5 V, due to power dissipation. REV. C REV. C |
类似零件编号 - AD831 |
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类似说明 - AD831 |
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