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SX1231
WIRELESS & SENSING PRODUCTS
Rx startup request
(sequencer or user)
TS_RE
DATASHEET
XO Started and PLL is locked
Analog FE’s
group delay
Tana
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
RSSI
sampling
Trssi
RSSI
sampling
Trssi
Reception of Packet
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
Tana
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
RSSI
sampling
Trssi
RSSI
sampling
Trssi
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
RSSI
sampling
Trssi
Reception of Packet
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
Tana
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
RSSI
sampling
Trssi
RSSI
sampling
Trssi
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
RSSI
sampling
Trssi
AFC
Tafc
PLL
lock
Tpllafc
Channel Filter’s
group delay
Tcf
DC Cutoff’s
group delay
Tdcc
Reception of Packet
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:
Tafc = 4 x Tbit
(also denoted TS_AFC in the general specification)
?
RSSI sample time:
Trssi = 2 x int(4.RxBw.Tbit)/(4.RxBw)
(see TS_RSSI in section 2)
Note
The above timings represent maximum settling times
Rev. 7 - June 2013
Page 39
www.semtech.com
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