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ADL5920ACPZ-R7 数据表(PDF) 22 Page - Analog Devices |
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ADL5920ACPZ-R7 数据表(HTML) 22 Page - Analog Devices |
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22 / 26 page ![]() ADL5920 Data Sheet Rev. B | Page 22 of 26 DC-COUPLED OPERATION The ADL5920 RFIN and RFOUT pins can be dc-coupled as shown in Figure 43. However, to drive the inputs with signals that are biased at 0 V, apply a negative supply of −2.5 V to the two VNEG pins as shown in Figure 43. If dc-coupled operation is required for the sake of applying low input frequencies, connect capacitors to the CHPF and CHPR pins to reduce the corner frequency of the offset compensation loops as previously detailed. In addition, connect the DECL pin (Pin 12) to ground to ensure that the specified directivity is achieved at low frequencies. REVERSE PATH RMS DETECTOR TEMPERATURE SENSOR 1.4V VREF 2.5V FORWARD PATH RMS DETECTOR BIDIRECTIONAL BRIDGE VTEMP VRMSR VREV CRMSR CHPR– CHPR+ VNEG1 RFIN TADJI C13 1µF C7 1µF 1kΩ VTGT VTGT VREF VOCM VOCM DECL VRMSF VFWD EPAD GND1 GND2 GND3 GND4 GND5 GND6 VPOS1 VPOS2 VPOS3 VDIFF+ C11 100pF C9 0.1µF C18 0.1µF VDIFF OUTPUT C1 0.1µF +5V –2.5V C6 100pF C14 100pF VDIFF– CRMSF CHPF– CHPF+ VNEG2 RFOUT 5 ADL5920 C16 100pF C5 0.1µF PWDN/TADJS 3.6kΩ R1 RFOP 0.1µF C12 0.1µF C8 RFIP –2.5V C17 100pF C15 0.1µF ×1 25 28 1 24 27 29 30 21 23 22 16 12 19 15 20 5 10 18 32 3 2 26 31 4 9 6 7 11 17 8 13 14 Figure 43. Basic Connections for DC-Coupled Operation |
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