SX1239IMLTRT Semtech, SX1239IMLTRT Datasheet - Page 66

• 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

7. Application Information
7.1. Crystal Resonator Specification
Table 26 shows the crystal resonator specification for the crystal reference oscillator circuit of the SX1239. This
specification covers the full range of operation of the SX1239 and is employed in the reference design.
Table 26 Crystal Specification
Notes - the initial frequency tolerance, temperature stability and ageing performance should be chosen in accordance
7.2. Reset of the Chip
A power-on reset of the SX1239 is triggered at power up. Additionally, a manual reset can be issued by controlling pin 6.
7.2.1. POR
If the application requires the disconnection of VDD from the SX1239, despite of the extremely low Sleep Mode current, the
user should wait for 10 ms from of the end of the POR cycle before commencing communications over the SPI bus. Pin 6
(Reset) should be left floating during the POR sequence.
Please note that any CLKOUT activity can also be used to detect that the chip is ready.
Rev 3 - Jan 2011
ADVANCED COMMUNICATIONS & SENSING
with the target operating temperature range and the receiver bandwidth selected.
- the loading capacitance should be applied externally, and adapted to the actual Cload specification of the XTAL.
- A minimum XTAL frequency of 28 MHz is required to cover the 863-870 MHz band, 29 MHz for the 902-928 MHz
band
Symbol
FXOSC
RS
C0
CLOAD
Description
XTAL Frequency
XTAL Serial Resistance
XTAL Shunt Capacitance
External Foot Capacitance
VDD
Pin 6
(output)
Undefined
Figure 34. POR Timing Diagram
Conditions
On each pin XTA and XTB
Wait for
10 ms
Page 66
Chip is ready from
this point on
Min
26
8
-
-
Typ
2.8
30
16
-
Max
140
32
22
7
DATASHEET
www.semtech.com
SX1239
MHz
ohms
pF
pF
Unit