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SI4420-D1-FT Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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SI4420-D1-FT Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
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9 / 33 page  Si4420 9 AC Characteristics (Transmitter) Symbol Parameter Conditions/Notes Min Typ Max Units IOUT Open collector output DC current Programmable 0.5 6 mA In low bands 8 Pmax Available output power with optimal antenna impedance (Note 3, 4) In high bands 4 dBm Pout Typical output power Selectable in 2.5 dB steps (Note 5) Pmax-21 Pmax dBm Psp Spurious emission At max power with loop antenna (Note 6) -50 dBc In low bands 2 2.6 3.2 Co Output capacitance (set by the automatic antenna tuning circuit) In high bands 2.1 2.7 3.3 pF In low bands 13 15 17 Qo Quality factor of the output capacitance In high bands 8 10 12 100 kHz from carrier -75 Lout Output phase noise 1 MHz from carrier -85 dBc/Hz BR FSK bit rate 256 kbps dffsk FSK frequency deviation Programmable in 15 kHz steps 15 240 kHz AC Characteristics (Turn-on/Turnaround timings) Symbol Parameter Conditions/Notes Min Typ Max Units tsx Crystal oscillator startup time Crystal ESR < 100 (Note 8) 1 5 ms Ttx_rx_XTAL_ON Transmitter - Receiver turnover time Synthesizer off, crystal oscillator on during TX/RX change with 10 MHz step 450 µs Trx_tx_XTAL_ON Receiver - Transmitter turnover time Synthesizer off, crystal oscillator on during RX/TX change with 10 MHz step 350 µs Ttx_rx_SYNT_ON Transmitter - Receiver turnover time Synthesizer and crystal oscillator on during TX/RX change with 10 MHz step 425 µs Trx_tx_SYNT_ON Receiver - Transmitter turnover time Synthesizer and crystal oscillator on during RX/TX change with 10 MHz step 300 µs AC Characteristics (Others) Symbol Parameter Conditions/Notes Min Typ Max Units Cxl Crystal load capacitance, see crystal selection guide Programmable in 0.5 pF steps, tolerance +/- 10% 8.5 16 pF tPOR Internal POR timeout After Vdd has reached 90% of final value (Note 7) 150 ms tPBt Wake-up timer clock accuracy Crystal oscillator must be enabled to ensure proper calibration at startup (Note 8) +/-10 % Cin, D Digital input capacitance 2 pF tr, f Digital output rise/fall time 15 pF pure capacitive load 10 ns All notes for tables above are on page 10. |
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