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LT5500EGN Datasheet(PDF) 8 Page - Linear Technology |
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LT5500EGN Datasheet(HTML) 8 Page - Linear Technology |
8 / 12 page 8 LT5500 5500f APPLICATIONS INFORMATION LO MIX_IN LO+ LO– LNA_OUT LNA_IN RF OUT LNA_GND GND GS EN LT5500 MIX_GND VCC *REFER TO FIGURE 6 FOR POWER SUPPLY PINS BYPASSING RECOMMENDATION VCC IF– 5500 F03 IF+ VCC •• T1 IF RF C4 100pF 100pF C17 L3 L5 4.7nH L7 IF OUTPUT RF INPUT L4 100pF 100pF L2 GAIN SELECT ENABLE LO INPUT MIXER RF INPUT C2 100pF APPLICATION DEPENDENT COMPONENT VALUES RF INPUT L4 L2 L3 C4 C17 L9 C23 L7 T1 1.8GHz 4.7nH 12nH 4.7nH 220pF 10pF 5.6nH 1.8pF 280MHz IF OUTPUT 2.5GHz 2.7nH 4.7nH 1.8nH 220pF 10pF 2.7nH 1.5pF BIAS C23 L9 VCC 15nH TC8-1 MINI-CIRCUITS * Figure 3. Simplified Test Schematic for 1.8GHz and 2.5GHz Applications An IF transformer can be used to create a single-ended output. The additional discrete components necessary to achieve a 50Ω match are tabulated in Figure 3. Alterna- tively, the discrete solution shown in Figure 4 can be used to perform differential to single-ended conversion. For best LO and RF signal suppression at the IF output, a transformer should be used. If it is desirable to reduce the gain of the mixer, a resistor between the IF outputs can be used. LO Buffer The LO inputs can be driven either differentially or single ended. A single-ended configuration is shown along with example component values in Figure 3. Optionally, the LO can be driven differentially as shown in Figure 5. C14 C12 L10 VCC L11 100pF 5500 F04 13 12 50Ω IF OUTPUT LT5500 IF+ IF– IF OUTPUT L10, L11 C12 C14 280MHz 27nH 3.3pF 2.2pF Figure 4. Alternative Mixer IF Output Matching Figure 5. Optional Transformer-Based Differential LO Drive L3 5500 F05 TX1 4:1 LO INPUT L3 TX1 2.22GHz 3.3nH TOKO-BF4 LO INPUT 19 18 LT5500 LO– LO+ |
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