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TRF5901 Datasheet(PDF) 10 Page - Texas Instruments |
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TRF5901 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page TRF5901 SINGLE-CHIP RF TRANSCEIVER SWRS014 – DECEMBER 2002 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 tw(CLKHI) CLOCK DATA STROBE tsu(DATA) th(DATA) tw(STROBEHI) tw(STROBELO) tw(CLKLO) Figure 2. Serial Data Interface Timing detailed description low-noise amplifier The low-noise amplifier (LNA) provides a typical gain of 13 dB and a typical noise figure of 3.3 dB. Two operating modes, normal and low-gain mode, can be selected. The normal operation mode is selected when maximum sensitivity at low input levels is required. If high RF input levels are applied to the TRF5901, the LNA should be operated in the low-gain mode. This ensures a minimum of nonlinear distortions in the overall receiver chain. Figure 3. Typical LNA Input Impedance (S11) at Device Terminal LNA_IN Figure 4. Typical LNA Output Impedance (S22) at Device Terminal LNA_OUT 0.5 1 ↑1 U 2 5 10 2 1 0.5 0.2 0 –0.5 –1 –2 –5 START 850 MHz STOP 950 MHz CH1 S11 CAL OFS CPL FIL 1k ↑1 U START 850 MHz STOP 950 MHz CH1 S22 CAL OFS CPL FIL 1k 1 1 5 0.5 1 2 5 10 2 1 0.5 0.2 0 –0.5 –1 –2 –5 5 The low impedance of the LNA input can be easily matched to 50 Ω to interface with a filter or an RF switch. At the LNA open collector output, a filter network can be used for image suppression as well as impedance matching. |
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