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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT5560EDD датащи(PDF) 21 Page - Linear Technology |
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LT5560EDD датащи(HTML) 21 Page - Linear Technology |
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21 / 28 page  LT5560 21 5560f R1 ( Ω) 0 4 6 8 10 5 10 15 20 5560 F13 25 12 14 5 7 9 11 13 30 TA = 25°C VCC = 3V SUPPLY CURRENT (mA) 4 4 6 8 10 14 5560 F14 2 0 –2 68 12 10 12 14 SSB NF IIP3 GAIN TA = 25°C VCC = 3V fLO = 760MHz fIF = 140MHz PLO = –2dBm SUPPLY CURRENT (mA) 4 4 6 8 10 14 5560 F15 2 0 –2 68 12 10 12 14 SSB NF IIP3 GAIN MEASURED WITH InF CAP ACROSS R1 TA = 25°C VCC = 3V fLO = 760MHz fIF = 140MHz PLO = –2dBm APPLICATIO S I FOR ATIO Figure 12. Enable Input Circuit Enable Interface Figure 12 shows a simplified schematic of the EN pin interface. The voltage necessary to turn on the LT5560 is 2V. To disable the chip, the enable voltage must be less than 0.3V. If the EN pin is allowed to float, the chip will tend to remain in its last operating state, thus it is not recom- mended that the enable function be used in this manner. If the shutdown function is not required, then the EN pin should be connected directly to VCC. The voltage at the EN pin should never exceed the power supply voltage (VCC) by more than 0.3V. If this should occur, the supply current could be sourced through the EN pin ESD diode, potentially damaging the IC. Figure 13. Typical Supply Current vs R1 Value Figure 14. 900MHz Upconverting Mixer Gain, Noise Figure and IIP3 vs Supply Current Figure 15. 900MHz Downconverting Mixer Gain, Noise Figure and IIP3 vs Supply Current Adjustable Supply Current The LT5560 offers a direct trade-off between power sup- ply current and linearity. This capability allows the user to optimize the performance and power dissipation of the mixer for a particular application. The supply current can be adjusted by changing the value of resistor R1 at the center-tap of the input balun. For downconversion applications, a bypass capacitor in parallel with R1 may be desired to minimize noise figure. The bypass capacitor has a greater effect on noise figure at larger values of R1. In upmixer configurations, adding a capacitor across R1 has little effect. Figure 13 shows the supply current as a function of R1. Note that the current will also be affected by parasitic resistance in the matching components. Figure 14 il- lustrates the effect of supply current on Gain, IIP3 and NF of a 900MHz upconverting mixer. The performance LT5560 60k EN VCC 5560 F12 2 vs current of a 900MHz downconverting mixer is plotted in Figure 15. In this example, a 1nF capacitor has been placed in parallel to R1 for best noise figure. |
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