SX1210 SEMTECH [Semtech Corporation], SX1210 Datasheet - Page 24

• Manufacturer Part Number: SX1210
• Description: Ultra-Low Power Integrated UHF Receiver
• Manufacturer: SEMTECH [Semtech Corporation]

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 logic “1”, the value of MCParam_OOK_floor_thres is below the noise floor
of the receiver chain. Conversely, if the output signal on DATA is logic “1”, the value of MAParam_floor_thres is
several dB above the noise floor.
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 following OOK demodulator parameters RXParam_OOK_thresh_step and
RXParam_OOK_thresh_dec_period can be optimized as described below for a given number of threshold
decrements per bit RXParam_OOK_thresh_dec_period:
For each decrement of RXParam_OOK_thresh_step:
Rev 2– Sept 8
ADVANCED COMMUNICATIO
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
once in each chip period (d)
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 (d)
1.0 dB
1.5 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.0 dB
th
, 2008
3.3.10.2. Optimizing OOK Demodulator Response for Fast Fading Signals
NS & SENSING
MCParam_OOK_floor_thres
Figure 17: Floor Threshold Optimization
Increment
Page 24 of 73
Default RXParam_OOK_thresh setting
Adjust Bit Rate, Channel filter BW
Set SX1210 in OOK Rx mode
Monitor DATA pin (pin 20)
Optimization complete
Continuous Mode
No input signal
Glitch activity
on DATA ?
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SX1210