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| 型号： | DR-TRC105-304-EV |
| 厂商： | RFM |
| 文件页数： | 51/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION 304MHZ RFM RFIC |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 频率： | 303.325MHz ~ 307.3MHz |
| 适用于相关产品： | TRC105 |
| 已供物品： | 2 个板，天线，电池 |
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6.3.2 OOK Demodulator Related Configuration Values
OOK demodulation in the TRC105 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 TRC105 provides three threshold options - fixed threshold, average-referenced threshold, and
peak-referenced threshold. MCFG01 bits 3..2 select the OOK threshold as shown in Table 62:
Pattern of Bits 3..2
00
01
10
11
Threshold
fixed
peak referenced
average referenced
not used
Table 62
The configuration settings for each of these threshold options depend directly or indirectly on the bit rate.
The fixed-threshold value is configured in MCFG13 . The fixed threshold can be adjusted in 0.5 dB increments
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 63:
Pattern of Bits 1..0
00
01
10
11
IF Gain
maximum
-4.5 dB
-9.0 dB
-13.5 dB
Table 63
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. Four cutoff
frequencies can be configured for this filter with RXCFG15 bits 1..0, as shown in Table 64 below:
Pattern of Bits 1..0
00
01
10
11
Cutoff Frequency
chip rate/ 32*π
chip rate/ 8*π
chip rate/ 4*π
chip rate/ 2*π
Table 64
The chip rate is equal to the bit rate except when Manchester encoding is used. For Manchester encoding, the
chip rate is equal to twice the bit rate. An adequately long 1-0-1- 0… preamble must be transmitted to center the
average-referenced threshold. A preamble of at least 24 bits is recommended. The average-referenced threshold
should be used in conjunction with a mechanism to avoid transmitting a long sequence of bits of the same value,
www.RFM.com E-mail: info@rfm.com
? 2009-2013 by RF Monolithics, Inc.
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Page 51 of 67
TRC105 - 05/29/13
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| DR-TRC105-315-DK | 功能描述:射频开发工具 TRC105 Development Kit 310-319 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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| DR-TRC105-345-DK | 功能描述:射频开发工具 TRC105 Development Kit 342-348 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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| DR-TRC105-372-DK | 功能描述:射频开发工具 TRC105 Development Kit 365-381 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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