MRF89XAT-I/MQ Microchip Technology, MRF89XAT-I/MQ Datasheet - Page 71
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MRF89XAT-I/MQ
Manufacturer Part Number
MRF89XAT-I/MQ
Description
RF ISM BAND TXRX 32 QFN
Manufacturer
Microchip Technology
Series
-r
Datasheet
1.MRF89XA-IMQ.pdf
(142 pages)
Specifications of MRF89XAT-I/MQ
Frequency
863MHz ~ 870MHz, 902MHz ~ 928MHz, 950MHz ~ 960MHz
Data Rate - Maximum
200 kbps
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
Memory Size
*
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Rf Ic Case Style
QFN
No. Of Pins
32
Svhc
No SVHC (20-Jun-2011)
Rohs Compliant
Yes
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
MRF89XAT-I/MQTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MRF89XAT-I/MQ
Manufacturer:
MICROCHIP
Quantity:
12 000
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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
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