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LTC5582IDD-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC5582IDD-PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC5582 5582f applicaTions inForMaTion Figure 4. Differential Input Configuration Figure 5. Single-Ended-to-Differential Conversion Figure 7. Output Voltage vs RF Input Power while the overall dynamic range remains the same. At high frequency, additional LC elements may be needed for the input impedance matching due to the parasitics of the transformer and PCB traces. J1 RF INPUT IN– 4 IN+ VCC T1 1:8 5582 F04 200 200 LTC5582 2 DEC 3 50pF Figure 6. RF Input Return Loss Due to the high input impedance of the LTC5582, a narrow band L-C matching network can be also used to convert a single-ended input to differential signal as shown in Figure 5. By this means, the sensitivity and overall linear dynamic rangeofthedetectorwillbeverysimilartotheoneusing1:8 RF input balun. The conversion gain is strongly dependent on the loss (or Q) of the matching network, particularly at high frequency. The lower the Q, the lower the conversion gain.However,thematchingbandwidthiscorrespondingly wider. The following formulas are provided to calculate the input matching network for single-ended-to-differential conversion at low RF frequency (i.e., below 1GHz). C C fc R fc pF S S IN 1 2 9 1 50 2 25 10 = = = π . • ( ) L R fc fc nH M IN = = 50 2 2 25 1010 π . • ( ) where RIN is the differential input resistance (400Ω) and fc is the center RF operating frequency. As an example, Figure 6 shows that good input return loss is achieved from 300MHz to 400MHz when Cs1= Cs2 = 6.8pF and LM = 66nH. Figure 7 show the sensitivity is also improved by 8dB at 350MHz while the dynamic range remains the same. Although these equations give a good starting point, it is usually necessary to adjust the component values after building and testing the circuit. As the RF operating frequency increases, the real values of CS1, CS2, LM will deviate from the above equations due to parasitics of the components, device and PCB layout. For a 50Ω input termination, the approximate RF input power range of the LTC5582 is from –60dBm to 2dBm, RF INPUT CS1 6.8pF CS2 6.8pF TO IN– TO IN+ 5582 F05 MATCHING NETWORK LM 66nH FREQUENCY (MHz) 0 0 –5 –10 –15 –20 –25 –30 5582 F06 1000 900 800 700 600 500 400 300 200 100 RF INPUT POWER (dBm) –75 –65 –25 –45 –5 5582 F07 5 –35 –55 –15 SINGLE-ENDED-TO- DIFFERENTIAL INPUTS SINGLE-ENDED 2.8 2.4 1.6 0.8 2.0 1.2 0.4 |
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