SX1239IMLTRT Semtech, SX1239IMLTRT Datasheet - Page 31

• Manufacturer Part Number: SX1239IMLTRT
• Description: IC, RF RECEIVER, 1.02GHz, QFN-24
• Manufacturer: Semtech

Specifications of SX1239IMLTRT

• Applications: Wireless Sensor Networks, Automated Meter Reading, Home And Building Automation
• Receiving Current: 16mA
• Data Rate: 300Kbps
• Modulation Type: FSK, OOK
• Sensitivity Dbm: -120dBm
• Rohs Compliant: Yes
• Rf Ic Case Style: QFN
• No. Of Pins: 24
• Sensitivity (dbm): -120dBm
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Lead Free Status / Rohs Status: Supplier Unconfirmed

The different timings shown above are as follows:
Note
Rev 3 - Jan 2011
(sequencer or user)
ADVANCED COMMUNICATIONS & SENSING
Rx startup request
XO Started and
RxReady
PLL is locked
ModeReady
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:
AFC sample time:
RSSI sample time:
ModeReady
RxReady
XO Started and PLL is locked
The above timings represent maximum settling times, and shorter settling times may be observed in real cases
Analog FE’s
group delay
Tana
(sequencer or user)
Rx startup request
Channel Filter’s
ModeReady
RxReady
XO Started and PLL is locked
group delay
Tcf
Analog FE’s
group delay
(sequencer or user)
Rx startup request
Tana
DC Cutoff’s
group delay
Tdcc
Channel Filter’s
sampling
Figure 14. Rx Startup - No AGC, no AFC
group delay
RSSI
Trssi
Figure 16. Rx Startup - AGC and AFC
Figure 15. Rx Startup - AGC, no AFC
Tcf
Analog FE’s
group delay
Tana
sampling
RSSI
Trssi
TS_RE_AGC&AFC
Tpllafc = 5 / PLLBW (PLLBW = 300 kHz)
DC Cutoff’s
group delay
Tafc = 4 x Tbit
Trssi = 2 x int(4.RxBw.Tbit)/(4.RxBw)
Tdcc = max(8 , 2^(round(log2(8.RxBw.Tbit)+1)) / (4.RxBw)
Tana = 20 us
Tcf = 21 / (4.RxBw)
Tcf = 34 / (4.RxBw)
Channel Filter’s
Channel Filter’s
Tdcc
group delay
group delay
Tcf
Tcf
TS_RE_AGC
sampling
Page 31
TS_RE
RSSI
Trssi
group delay
DC Cutoff’s
Tdcc
DC Cutoff’s
group delay
sampling
Tdcc
RSSI
Trssi
sampling
RSSI
Trssi
(also denoted TS_AFC in the general specification)
sampling
Channel Filter’s
RSSI
Trssi
group delay
The LNA gain is adjusted by
the AGC, according to the
Tcf
AFC
Tafc
sampling
RSSI result
RSSI
Trssi
Tpllafc
PLL
lock
DC Cutoff’s
group delay
Channel Filter’s
group delay
Tdcc
Tcf
Reception of Packet
(aka TS_RSSI)
sampling
RSSI
Trssi
DC Cutoff’s
group delay
Tdcc
The LNA gain is adjusted by
Reception of Packet
the AGC, according to the
Carrier Frequency is adjusted
Reception of Packet
DATASHEET
RSSI result
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SX1239
by the AFC