MRF89XA-I/MQ Microchip Technology, MRF89XA-I/MQ Datasheet - Page 71

• Manufacturer Part Number: MRF89XA-I/MQ
• Description: TXRX ISM SUB-GHZ ULP 32QFN
• Manufacturer: Microchip Technology

Specifications of MRF89XA-I/MQ

• Package / Case: 32-WFQFN Exposed Pad
• Frequency: 863MHz ~ 870MHz, 902MHz ~ 928MHz, 950MHz ~ 960MHz
• Data Rate - Maximum: 200kbps
• Modulation Or Protocol: FSK, OOK
• Applications: ISM
• Power - Output: 12.5dBm
• Sensitivity: -113dBm
• 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
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 863 MHz to 870 MHz, 902 MHz to 928 MHz, 950 MHz to 960 MHz
• Interface Type: SPI
• Noise Figure: - 112 dBc
• Output Power: - 8.5 dBm, + 12.5 dBm
• Operating Supply Voltage: 2.1 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Data Rate: 256 Kbps
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.4.10.1
The FTOVAL<7:0> bits (FLTHREG<7:0>) determine
the sensitivity of the OOK receiver, as it sets the com-
parison threshold for weak input signals (that is, those
close to the noise floor). Significant sensitivity
improvements can be generated if configured correctly.
The noise floor of the receiver at the demodulator input
depends on the following conditions:
• The noise figure of the receiver
• The gain of the receive chain from antenna to
• The matching, including SAW filter
• The bandwidth of the channel filters
FIGURE 3-12:
© 2010 Microchip Technology Inc.
base band
Optimizing the Floor Threshold
FLOOR THRESHOLD OPTIMIZATION
FTOVAL<7:0>
Increment
Yes
Preliminary
Set MRF89XA in OOK RX mode
Default OOKTHSV<2:0> setting
Adjust Bit Rate, Channel filter BW
It is therefore important to note that the setting of the
FTOVAL<7:0> bits will be application-dependant. The
procedure shown in the flow chart in Figure 3-12 is
recommended to optimize the FTOVAL<7:0> bits.
The new floor threshold value found during this test
should be the value used for OOK reception with those
receiver settings.
Note that if the output signal on DATA is a logic ‘1’, the
value due to the FTOVAL<7:0> bits is below the noise
floor of the receiver chain. Conversely, if the output sig-
nal on DATA is a logic ‘1’, the value due to the
FTOVAL<7:0> bits is several dB above the noise floor.
Monitor DATA pin (pin 20)
Optimization complete
Continuous mode
No input signal
Glitch activity
on DATA ?
No
MRF89XA
DS70622B-page 71