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参数资料
| 型号： | MRF89XAT-I/MQ |
| 厂商： | Microchip Technology |
| 文件页数： | 86/140页 |
| 文件大小： | 0K |
| 描述： | RF ISM BAND TXRX 32 QFN |
| 标准包装： | 1 |
| 频率： | 863MHz ~ 870MHz，902MHz ~ 928MHz，950MHz ~ 960MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK，OOK |
| 应用： | ISM |
| 功率 - 输出： | 12.5dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 电流 - 传输： | 25mA |
| 数据接口： | PCB，表面贴装 |
| 存储容量： | * |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MRF89XAT-I/MQDKR |
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MRF89XA
3.11.4
DC-FREE DATA MECHANISMS
In this case, the maximum chip rate is the maximum bit
The payload to be transmitted may contain long
sequences of ‘ 1 ’s and ‘ 0 ’s, which introduces a DC bias
in the transmitted signal, which causes a non-uniform
power distribution spectrum over the occupied channel
bandwidth. These sequences also degrade the
performance of the demodulation and data, and clock
recovery functions in the receiver, which basically
introduces data dependencies in the normal operation
of the demodulator. System performance can be
enhanced if the payload bits are randomized to reduce
DC biases and increase the number of bit transitions.
Therefore, it is useful if the transmitted data is random
and DC-free.
To handle such instances, two techniques are available
in the packet handler: Manchester encoding and Data
Whitening. However, only one of the two methods
should be enabled at a time.
rate given in the specifications section and the actual
bit rate is half the chip rate. Manchester encoding and
decoding is only applied to the payload and CRC
checksum while preamble and Sync word are kept
NRZ. However, the chip rate from preamble to CRC is
the same and defined by the BRVAL<6:0> bits
(BRSREG<6:0>) (Chip Rate = Bit Rate NRZ = 2 x Bit
Rate Manchester).
Therefore Manchester encoding/decoding is made
transparent for the user, who still provides/retrieves
NRZ data to/from the FIFO. See the Manchester
encoding/decoding bit pattern in Figure 3-30 .
3.11.4.2 Data Whitening
Another technique called data whitening or scrambling
is widely used for randomizing the user data before
radio transmission. The data is whitened using a
random sequence on the TX side and dewhitened on
3.11.4.1
Manchester Data Encoding
the RX side using the same sequence. Compared to
Manchester encoding/decoding is enabled by setting
the MCHSTREN bit (PLOADREG<7>) and can be
used in Packet mode only. The NRZ data is converted
to Manchester code by coding ‘ 1 ’ as ‘ 10 ’ and ‘ 0 ’ as ‘ 01 ’.
Figure 3-29 illustrates Manchester data encoding. NRZ
data is converted to Manchester by encoding 1 bits as
10 chip sequences, and 0 bits as 01 chip sequences.
Manchester encoding guarantees DC-balance and
frequent data transitions in the encoded data. The
maximum Manchester chip rate corresponds to the
maximum bit rate given in the Transmitter Electrical
specifications in Table 5-6 .
Manchester technique it has the advantage of retaining
the NRZ data rate (that is, actual bit rate is not halved).
The whitening/dewhitening process is enabled by
setting the WHITEN1 bit (PKTCREG<4>). A 9-bit
Linear Feedback Shift Register (LFSR) is used to
generate a random sequence. The payload and 2-byte
CRC checksum is then XORed with this random
sequence as illustrated in Figure 3-31 . The data is
dewhitened on the receiver side by XORing with the
same random sequence.
Payload whitening/dewhitening is made transparent for
the user, who still provides/retrieves NRZ data to/from
the FIFO.
FIGURE 3-29:
FIGURE 3-30:
MANCHESTER DATA ENCODING
MANCHESTER ENCODING/DECODING
1/BR 1/ ...Sync
BR
Payload...
RF chips @ BR
...
1
1
1
0
1
0
0
1
00
1
0 1 10
1
0
...
User/NRZ bits
Manchester OFF
...
1
1
1
0
1
0
0
1
00
1
0
1
10
1
0
...
t
User/NRZ bits
Manchester ON
...
1
1
1
0
1
0
0
10
01
1
...
DS70622C-page 86
Preliminary
? 2010–2011 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MRF8HP21080HR3 | 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780H-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray |
| MRF8HP21080HR5 | 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780H-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray |
| MRF8HP21080HSR3 | 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780S-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray |
| MRF8HP21080HSR5 | 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 160W NI780S-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray |
| MRF8HP21130HR3 | 功能描述:射频MOSFET电源晶体管 HV8 2.1GHZ 130W NI780-4 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶体管极性: 频率:1800 MHz to 2000 MHz 增益:27 dB 输出功率:100 W 汲极/源极击穿电压: 漏极连续电流: 闸/源击穿电压: 最大工作温度: 封装 / 箱体:NI-780-4 封装:Tray |
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