收藏本站
XE1205
5.2.5.2
Bit synchronizer in buffered mode
In buffered mode the bit synchronizer is automatically enabled (DCLK is not externally available).
5.2.5.3
Pattern recognition block in buffere d mode
In buffered mode the pattern recognition block is automatically enabled. The PATTERN signal m ay be mapped to pin
IR Q_0. Please refer to section 5.2.2 for further details.
5.2.5.4
RSSI in buffered mode
In buffered mode the Received Signal Strength Indica tion operates the same way as in continuous mode. In buffered
m ode, however, RSSI_irq may be mapped to IRQ_1 (please refer to section 5.2.2) instead of to IRQ_0 in continuous
mode.
5.2.5.5
Frequency Error Indicator in buffered mode – FEI
I n buffe red mode the Frequency Error Indication operates the same way as in continuous mode. Please refer to section
5.2.3.5 for more details.
5.2.6
Additional narrowband filter bandwidths
T he lowest bandwidth for the base -band filter which can be selected by changing only a 2-bit word in the configuration
re gister is 10 kHz. However, as described in section 7.2.8, additional register settings allow this bandwidth to be further
reduce d. This option allows the user to improve the se lectivity of the receiver for very narrow-band applications.
Activating this option is advised for bit rates and frequency deviations not higher than 4.8 kbit/s and 5 kHz and if the LO
frequency of the receiver is well controlled, for instance by means of a very accurate crystal or the activation of an AFC.
T he table below gives the sensitivity and the adjacent channel rejection for BR = 4.8 kbit/s and Δ f = 5 kHz for different
bandwidths.
Bandwidth
SSB
10 kHz
9 kHz
8 kHz
7 kHz
TParam_Low _BW
0
1
1
1
TParam_Code_BW(8:0)
X
139
160
185
Sensitivity
RFS
(BER=0.1%)
-116 dBm
-116 dBm
-115.5 dBm
-115 dBm
Adjacent Channel Rejection
ACR
(25 kHz offset single tone)
20 dBc
25 dBc
30 dBc
35 dBc
Table 8: Performances of the recei ver fo r very narro w bandwidths and 4.8 kbit/s
Table 9 below gives the sensitivity and the adjacent channel rejection for BR = 1.2 kbit/s and Δ f = 2 kHz.
Bandwidth
SSB
TParam_Low _BW
TParam_Code_BW(8:0)
Sensitivity
RFS
Adjacent Channel Rejection
ACR
(BER=0.1%)
(25 kHz offset sing le tone)
10 kHz
9 kHz
8 kHz
7 kHz
0
1
1
1
X
139
160
185
-117.5 dBm
-118 dBm
-119 dBm
-119.5 dBm
18 dBc
23 dBc
28 dBc
33 dBc
Table 9: Performances of the r eceiver for very narrow bandwidth s and 1.2 kbit/s
It can be seen from table 9 that this option also allows the sensitivity to be improved for very low bit rates and frequency
deviations.
? Semtech 2008
17
www.semtech.com
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
XE1283I076TRLF IC TXRX UHF LOW POWER 72-LFBGA
XE135B LAMP GAS T3.25 XENON 13.5V .375A
XE193 LAMP GAS T-3.25 XENON 14V .33A
XE2405 LAMP GAS FILLED BI-PIN 24V 5W
XE2410 LAMP GAS FILLED BI-PIN 24V 10W
XEB09-BIS MODEM ETHERNT BRDGE MPT OUTDOOR
XK-Z11-S ZIGBEE MODULE DEVELOPMENT KIT
XOB17-12X1-TR SENSOR MONOCRYSTALLINE MODULE
相关代理商/技术参数
XE1205SKC915XE1 功能描述:KIT STARTER FOR XE1205 915MHZ RoHS:否 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:TrueRF™ 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796
XE1209 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Ultra Low Power CMOS Transceiver
XE1209C012TRLF 制造商:Semtech Corporation 功能描述:
XE1209C061TRLF 制造商:Semtech Corporation 功能描述:
XE1212 制造商:未知厂家 制造商全称:未知厂家 功能描述:MODEM
XE1212BL5 制造商:未知厂家 制造商全称:未知厂家 功能描述:Telecommunication IC
XE1212E 制造商:未知厂家 制造商全称:未知厂家 功能描述:MODEM
XE1212L 制造商:未知厂家 制造商全称:未知厂家 功能描述:MODEM