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MC13852 Datenblatt(PDF) 11 Page - Freescale Semiconductor, Inc |
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MC13852 Datenblatt(HTML) 11 Page - Freescale Semiconductor, Inc |
11 / 30 page Applications Information MC13852 Advance Information, Rev. 2.0 Freescale Semiconductor 11 3.2 900 MHz Application This application circuit is designed to demonstrate performance at 900 MHz. Typical results of NF = 1.2 dB, S21 gain = 18.5 dB, and OIP3 of 14.2 dBm. By varying the value of resistor R1, the current draw and IP3 performance of the device can be tailored for a particular application. Two values of bias resistor R1 are shown to demonstrate performance for different IP3 and Icc requirements. • Resistor R3 is used to de-Q output inductor L2 and adjust gain and return losses. Reducing R3 lowers gain and improves return losses. • Inductor L1 can be raised in value at lower current operation to improve return losses. Typical performance that can be expected from this circuit at 2.75 V is listed in Table 7. Figure 8 is the 900 MHz application schematic with package pinouts and the circuit component topology. Figure 8. 900 MHz Application Schematic Input Return Loss High Gain Bypass S11 — — -5.5 -17.2 -4.5 -15.5 dB Gain High Gain Bypass S21 18.3 -9.3 19.3 -8.3 — — dB Reverse Isolation High Gain Bypass S12 — — -35 -8.3 -32 -7.3 dB Output Return Loss High Gain Bypass S22 — — -13.9 -20.4 -11 -19 dB Table 6. Typical 434 MHz Evaluation Board Performance (Vcc = 2.75V, TA = 25 °C) (continued) Characteristic Symbol Min Typ Max Unit RF OUT R2 20 ohm L1 12 nH C1 3.9 pF L2 10 nH C4 33 pF C3 .01u pF Gain Vcc RF IN . Enable Rbias R1 1.2 kohm C2 2.4 pF 6 1 3 2 Logic 7 5 4 8 R3 200 ohm L3 270 nH |
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