SX1212IWLTRT Semtech, SX1212IWLTRT Datasheet - Page 26

• Manufacturer Part Number: SX1212IWLTRT
• Description: IC TXRX 300MHZ-510MHZ 32-TQFN
• Manufacturer: Semtech

Specifications of SX1212IWLTRT

• Frequency: 300MHz ~ 510MHz
• Data Rate - Maximum: 150kbps
• Modulation Or Protocol: FSK, OOK
• Applications: AMR, ISM, Home Automation, Process Control
• Power - Output: 12.5dBm
• Sensitivity: -110dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 3mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFN
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Modulation Type: FSK/OOK
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: SX1212IWLTR

Error! Reference source not found. suggests filter settings in FSK mode, along with the corresponding passive
filter bandwidth and the accepted tolerance on the crystal reference.
The center frequency, fo, is always set to 100kHz. The following chart shows the receiver bandwidth when
changing RXParam_Butterfilt bits, whilst the polyphase filter is activated.
Error! Reference source not found. suggests a few filter settings in OOK mode, along with the corresponding
passive filter bandwidth and the accepted tolerance on the crystal reference.
After filtering, the In-phase and Quadrature signals are amplified by a chain of 11 amplifiers, each with 6dB gain.
The outputs of these amplifiers are used to evaluate the Received Signal Strength (RSSI).
Whilst the RSSI resolution is 0.5 dB, the absolute accuracy is not expected to be better than +/- 3dB due to process
and external component variation. Higher accuracy whilst performing absolute RSSI measurements will require
additional calibration.
Rev 2 – June 18th, 2009
ADVANCE
3.4.6. Channel Filters Setting in OOK Mode
3.4.7. RSSI
D COMMUNICATIONS & SENSING
3.4.7.1. Resolution and Accuracy
3.4.7.2. Acquisition Time
450
400
350
300
250
200
150
100
450
400
350
300
250
200
150
100
50
50
0
0
0
0
Figure 18: Butterworth Filter's Actual BW
Figure 19: Polyphase Filter's Actual BW
2
2
4
4
Butterworth Filter's BW, FSK
Polyphase Filter's BW, OOK
Page 26 of 77
Val (RXParam_ButterFilt) [d]
6
6
Val (RXParam_ButterFilt [d]
RXParam_PolypFilt="0011"
8
8
10
10
12
12
Actual
BW
Actual
BW
Theoretical
BW
14
14
Theoretical
BW
16
16
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