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| 型号： | DR-TRC103-950-DK |
| 厂商： | RFM |
| 文件页数： | 49/65页 |
| 文件大小： | 0K |
| 描述： | KIT DEV 950MHZ RFIC SRR |
| 标准包装： | 1 |
| 类型： | 收发器，SRR |
| 频率： | 950MHz ~ 960MHz |
| 适用于相关产品： | TRC103-950 |
| 已供物品： | 2 个板，天线，电池，线缆，CD，电源适配器 |
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Pattern of Bits 7..4
1101
1110
1111
R-C Filter Bandwidth
514 kHz
676 kHz
987 kHz
Table 57
6.3.2 OOK Demodulator Related Configuration Values
OOK demodulation in the TRC103 is accomplished by comparing the RSSI to a threshold value. An RSSI value
greater than the threshold is “sliced” to a logic 1, and an RSSI value equal or less than the RSSI value is sliced to
a logic 0. The TRC103 provides three threshold options - fixed threshold, average-referenced threshold, and
peak-referenced threshold. MCFG01 bits 4..3 select the OOK threshold as shown in Table 58:
Pattern of Bits 4..3
00
01
10
11
Threshold
fixed
peak referenced
average referenced
not used
Table 58
The configuration settings for each of these threshold options depend directly or indirectly on the bit rate.
The fixed-threshold value is configured in MCFG04 bits 7..0. The fixed threshold can be adjusted in 0.5 dB incre-
ments over a range of 128 dB. Also, the gain of the IF can be adjusted over a range of 13.5 dB to reduce the
RSSI value under no signal conditions. MCFG01 bits 1..0 select the IF gain as shown in Table 59:
Pattern of Bits 1..0
00
01
10
11
IF Gain
maximum
-4.5 dB
-9.0 dB
-13.5 dB
Table 59
The useable threshold setting depends on the RF operating band, the bandwidths of the receiver filters, the RF
noise generated by host circuitry, the RF noise generated in the application environment, and the antenna effi-
ciency. The fixed threshold is adjusted heuristically by incrementing the threshold while monitoring the data output
pin with an oscilloscope. The threshold is adjusted upward under no signal conditions until noise spikes on the
data output are reduced to an average of one spike every five or more seconds. Because the fixed threshold has
no automatic adjustment capability, it should only be used in applications where incidental RF noise generators
such as PCs, switchgear, etc., are not present.
The average-referenced threshold is generated by passing the RSSI signal through a low-pass filter. Two cutoff
frequencies can be configured for this filter. This selection is done with RXCFG15 bit1. A 0 value selects F CAS and
1 value selects F CAL :
F CAS = BR/(8* π ) = 0.04*BR
and
F CAL = BR/(32* π ) = 0.01*BR
Where F CAS and F CAL are in kHz and BR is in kb/s. F CAS is used when a sequence of received bits of the same
value is limited to 8, and F CAL is used when a sequence of bits of the same value is limited to 32. An adequately
long 1-0-1-0… preamble must be transmitted to center the threshold for each cutoff frequency. A preamble of at
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Page 49 of 65
TRC103 - 11/29/12
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| DR-TRC105-304-EV | 功能描述:射频开发工具 TRC105 Evaluation Board 303-307 MHz RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
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