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LT5525EUF Datasheet(PDF) 9 Page - Linear Technology |
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LT5525EUF Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LT5525 5525f APPLICATIO S I FOR ATIO single-ended drive, though differential drive can be used if desired. The LO input is internally matched to 50Ω. A simplified schematic for the LO input is shown in Figure 7. Measured return loss is shown in Figure 8. If the LO source has a DC voltage present, then a coupling capacitor should be used in series with the LO input pin due to the internal resistive match. The LO port input impedance and reflection coefficient (S11) versus frequency are shown in Table 2. The listed data is referenced to the LO+ pin with the LO– pin grounded. Table 2. Single-Ended LO Input Impedance FREQUENCY INPUT REFLECTION COEFFICIENT (MHz) IMPEDANCE MAG ANGLE 100 93.1 – j121 0.686 –30 250 55.8 – j54 0.457 –57 500 47.7 – j28 0.276 –79 1000 42.3 – j14 0.171 –110 1500 38.5 – j9.3 0.166 –135 2000 35.8 – j7.8 0.187 –146 2500 34.8 – j7.8 0.281 –148 3000 34.2 – j8.7 0.214 –149 IF Output Port A simplified schematic of the IF output circuit is shown in Figure 9. The output pins, IF+ and IF–, are internally con- nected to the collectors of the mixer switching transistors. Both pins must be biased at the supply voltage, which can be applied through the center-tap of a transformer or Figure 7. LO Input Schematic Figure 9. IF Output with External Matching Figure 8. LO Input Return Loss Figure 5. Wideband RF Input Matching Figure 6. RF Input Return Loss Using Wideband Matching Network 2 RF+ RFIN L3 1.5nH C5 4.7pF LT5525 5525 F05 3 RF– RF FREQUENCY (MHz) 500 –30 –25 –20 –15 –10 –5 0 1000 1500 2000 2500 5525 F06 3000 SERIES 1.5nH AND 4.7pF NO EXTERNAL RF MATCHING 14 LO– 480Ω 20pF 20pF LOIN 50Ω LT5525 5525 F07 15 LO+ VCC 54Ω FREQUENCY (MHz) 0 –20 –15 –10 –5 0 500 1000 1500 2000 5525 F08 2500 3000 10 11 575Ω C3 5525 F09 VCC L3 IFOUT T2 4:1 L2 VCC 0.7pF LT5525 IF– IF+ |
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