MRF89XA-I/MQ Microchip Technology, MRF89XA-I/MQ Datasheet - Page 72

• 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

3.4.10.2
A sudden drop in signal strength can cause the bit error
rate to increase. For applications, where the expected
signal drop can be estimated, the OOK demodulator
parameters set by the OOKTHSV<2:0> and OOK-
THPV<2:0>
OOKCREG<4:2>) can be optimized.
For a given number of threshold decrements per bit,
specified by OOKTHPV<2:0>:
• 000
• 001
• 010
• 011
• 100
• 101
• 110
• 111
For each decrement of value from OOKTHSV<2:0>
bits:
• 000
• 001
• 010
• 011
• 100
• 101
• 110
• 111
DS70622B-page 72
MRF89XA
once in each chip period (default)
once in 2 chip periods
once in 4 chip periods
once in 8 chip periods
twice in each chip period
4 times in each chip period
8 times in each chip period
16 times in each chip period
0.5 dB (default)
1.0 dB
1.5 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.0 dB
Optimizing OOK Demodulator
Response for Fast Fading Signals
bits
(OOKCREG<7:5>
and
Preliminary
3.4.10.3
In addition to the Peak OOK threshold mode, the user
can alternatively select other two types of threshold
detectors:
• Fixed threshold: The value is selected through the
• Average threshold: Data supplied by the RSSI
In Equation 3-14, the higher cut-off frequency enables
a sequence of up to eight consecutive ‘0’s or ‘1’s to be
supported, while the lower cut-off frequency presented
in Equation 3-15 allows for the correct reception of up
to 32 consecutive ‘0’s or ‘1’s.
EQUATION 3-14:
EQUATION 3-15:
OOKCREG register (for more information, refer to
Section 3.4.10.1 “Optimizing the Floor Thresh-
old”).
block is averaged with the cut-off frequency.
OOKATHC<1:0>
OOKATHC<1:0>
Alternative OOK Demodulator
Threshold Modes
=
=
00
© 2010 Microchip Technology Inc.
11
⇒
⇒
f
cutoff
f
cutoff
=
=
BRVAL<6:0>
--------------------------------- -
BRVAL<6:0>
--------------------------------- -
8 π
32 π
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•