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LT5570IDD-PBF Datasheet(PDF) 11 Page - Linear Technology |
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LT5570IDD-PBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LT5570 11 5570f The LT5570 is a mean-squared RF power detector, capable of measuring an RF signal over the frequency range from 40MHz to 2.7GHz, independent of input waveforms with different crest factors such as CW, CDMA, WCDMA, TD- SCDMA and WiMAX signals. A wide dynamic range is achieved with very stable output within the full temperature range from –40˚C to 85˚C. RF Inputs The differential RF inputs are internally biased at VCC – 1.224V. The differential impedance is about 200Ω. These pins should be DC blocked when connected to ground or other matching components. The impedance vs. frequency of the differential RF input is detailed in the following table. Figure 5. Single-Ended Input Configuration The LT5570’s differential inputs are optimally driven from a fully balanced source. When the signal is from a single- ended 50Ω source, conversion to a differential signal is required to achieve the maximum dynamic range. This is best achieved using a 1:4 balun to match the internal 200Ω input impedance as shown in Figures 1 and 3. This impedance transformation results in 6dB voltage gain. At high frequency, additional LC elements may be needed for input impedance matching due to the parasitics of the transformer and PCB trace. The approximate RF input power range of the LT5570 is 60dB at frequencies up to 900MHz, even with high crest factor signals such as a 4-carrier W-CDMA waveform. However the minimum detectable RF power level degrades as the input RF frequency increases. Due to the high RF input impedance of the LT5570, a narrow band L-C matching network can be used for the conversion of a single-ended to balanced signal as well. By this means, the sensitivity and overall linear dynamic range of the detector remain the same, without using an RF balun. The LT5570 can also be driven in a single-ended con- figuration. Figure 5 shows the simplified circuit of this single-ended configuration. The DEC Pin is preferably ac- coupled to ground via a capacitor rather than left floating. APPLICATIONS INFORMATION Table 1. RF Differential Input Impedance FREQUENCY (MHz) DIFFERENTIAL INPUT IMPEDANCE (Ω) S11 MAG ANGLE (°) 40 204 –j 0.6 0.606 –0.1 100 204 –j 1.8 0.606 –0.3 200 204 –j 3.6 0.606 –0.5 400 203.5 –j 7.3 0.606 –1.1 600 202.8 –j 10.9 0.605 –1.6 800 201.8 –j 14.5 0.604 –2.1 1000 200.6 –j17.9 0.603 –2.7 1200 199.1 –j21.3 0.602 –3.2 1400 197.3 –j24.7 0.601 –3.8 1600 195.4 –j27.9 0.599 –4.4 1800 193.2 –j31.1 0.598 –5.0 2000 190.8 –j34.2 0.596 –5.6 2200 188.2 –j37.4 0.593 –6.2 2400 185.3 –j40.4 0.591 –6.9 2600 181.9 –j43.5 0.589 –7.6 2800 178.3 –j46.4 0.586 –8.4 3000 174.4 –j49.3 0.582 –9.2 100 1nF IN+ DEC IN– RF INPUT 1nF 100 100 5570 F05 LT5570 |
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