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TRF6901PTR Datasheet(PDF) 10 Page - Texas Instruments |
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TRF6901PTR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page TRF6901 SINGLECHIP RF TRANSCEIVER SLWS110G − SEPTEMBER 2001 − REVISED JUNE 2004 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description low-noise amplifier (LNA)/RF mixer The LNA has differential inputs. The off-chip input matching network has the dual task of matching a 50- Ω connector (or antenna, switch, filter, etc.) to the differential inputs and providing a 180-degree phase shift between the inputs at terminals 1 and 2. The differential input impedance of the LNA is approximately 500 Ω in parallel with 0.7 pF. The predicted noise figure of the LNA and input matching circuit is 2.5 dB. The cascaded noise figure for the LNA/mixer is listed in the specifications. The mixer offers good linearity (high IP3). An external matching network is required to transform the output impedance of the mixer (1.4 k Ω) to the input impedance of the IF filter (typically 330 Ω). 0.5 1 2 5 10 2 1 0.5 0.2 0 −0.5 −1 −2 −5 5 ↑1 U START 850 MHz STOP 1000 MHz CH1 S11 CAL OFS CPL FIL 1k Figure 3. Typical LNA Input Impedance (S11) at Device Terminals LNA_IN1,2 IF amplifier/limiter The IF amplifier has differential inputs to its first stage. The limiting amplifier provides 68 dB of gain. An external impedance matching network is required between the IF filter output and the IF amplifier inputs at terminals 43 and 44. RSSI The received signal strength indicator (RSSI) voltage at terminal 41 is proportional to the log of the down-converted RF signal at the IF limiting amplifier input. The RSSI circuit is temperature compensated and is useful for detecting interfering signals, transceiver handshaking, and RF channel selection. In some applications it can be used as a demodulator for amplitude-shift\keying (ASK) or on-off keying (OOK) modulation. |
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