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TRF5901PTR Datasheet(PDF) 11 Page - Texas Instruments |
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TRF5901PTR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 34 page TRF5901 SINGLE-CHIP RF TRANSCEIVER SWRS014 – DECEMBER 2002 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 RF mixer The RF mixer is designed to operate with the on-chip VCO. If an external LO is used, a typical drive level of –10 dBm should be applied at the VCO input terminal. The mixer is a conventional double-balanced Gilbert cell mixer designed to provide a high IP3, typically 1 dBm. Since the mixer output’s push-pull amplifier has a 330- Ω output impedance, a conventional 330-Ω ceramic filter can be directly connected to the output without additional matching. The mixer output can also be directly connected to the second IF amplifier/limiter input terminal, IF2_IN, through a single conventional 330- Ω ceramic filter, thus bypassing the first IF amplifier. Figure 5 and Figure 6 show the RF mixer input and output impedances, respectively. Figure 5. Typical RF Mixer Input Impedance (S11) at Device Terminal MIX_IN Figure 6. Typical RF Mixer Output Impedance (S22) at Device Terminal MIX_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 5 MHz STOP 25 MHz CH1 S22 CAL OFS CPL FIL 1k 1 5 0.5 1 2 5 10 2 1 0.5 0.2 0 –0.5 –1 –2 –5 5 1 first IF amplifier The first IF amplifier provides a typical gain of 7 dB to compensate for losses caused by a ceramic filter. The input and output of the first IF amplifier is matched internally to 330 Ω, permitting direct connections to 330-Ω ceramic filters. If filters with different impedances are used, an impedance matching network is required. A second filter can be connected between the first IF amplifier and the second IF amplifier/limiter to increase the receiver selectivity. Alternately, the RF mixer output can be directly connected to the second IF amplifier as shown in Figure 7. A single ceramic filter can also be used to connect terminal 41 to terminal 39. In this case, a 0.1- µF dc-blocking capacitor should be used to connect terminal 44 to 42 to maximize receiver sensitivity. |
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