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RF69 Datasheet(PDF) 37 Page - List of Unclassifed Manufacturers |
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RF69 Datasheet(HTML) 37 Page - List of Unclassifed Manufacturers |
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37 / 81 page  RF69 Page 37 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com Rx startup request (sequencer or user) TS_RE XO Started and PLL is locked Analog FE ‟ s group delay Channel Filter‟ s group delay DC C utoff‟ s group delay RSSI sampling RSSI sampling Reception of Packet Tana Tcf Tdcc Trssi Trssi ModeReady RxReady Received Packet Preamble may start Figure 18. Rx Startup - No AGC, no AFC Rx startup request (sequencer or user) TS_RE_AGC The LNA gain is adjusted by the AGC, according to the RSSI result XO Started and PLL is locked Analog FE ‟ s group delay Channel Filter‟ s group delay DC Cu toff‟ s group delay RSSI sampling RSSI sampling Channel Filter‟ s group delay DC Cuto ff‟ s group delay RSSI sampling Reception of Packet Tana Tcf Tdcc Trssi Trssi Tcf Tdcc Trssi ModeReady RxReady Received Packet Preamble may start Figure 19. Rx Startup - AGC, no AFC Rx startup request (sequencer or user) TS_RE_AGC&AFC The LNA gain is adjusted by the AGC, according to the RSSI result Carrier Frequency is adjusted by the AFC XO Started and PLL is locked Analog FE‟ s group delay Channel Filter‟ s group delay DC Cutoff ‟ s group delay RSSI sampling RSSI sampling Channel Filter‟ s group delay DC C utoff‟ s group delay RSSI sampling AFC PLL lock Channel Filter‟ s group delay DC Cuto ff‟ s group delay Reception of Packet Tana Tcf Tdcc Trssi Trssi Tcf Tdcc Trssi Tafc Tpllafc Tcf Tdcc ModeReady RxReady Received Packet Preamble may start Figure 20. Rx Startup - AGC and AFC The different timings shown above are as follows: Group delay of the analog front end: Channel filter ‟ s group delay in FSK mode: Channel filter ‟ s group delay in OOK mode: DC Cutoff ‟ s group delay: PLL lock time after AFC adjustment: Tana = 20 us Tcf = 21 / (4.RxBw) Tcf = 34 / (4.RxBw) Tdcc = max(8 , 2^(round(log2(8.RxBw.Tbit)+1)) / (4.RxBw) Tpllafc = 5 / PLLBW (PLLBW = 300 kHz) AFC sample time: RSSI sample time: Tafc = 4 x Tbit (also denoted TS_AFC in the general specification) Trssi = 2 x int(4.RxBw.Tbit)/(4.RxBw) (aka TS_RSSI) |
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