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EVB72016-315-FSK-C 参数 Datasheet PDF下载

EVB72016-315-FSK-C图片预览
型号: EVB72016-315-FSK-C
PDF下载: 下载PDF文件 查看货源
内容描述: 433MHz的FSK / ASK发射评估板说明 [433MHz FSK/ASK Transmitter Evaluation Board Description]
分类和应用:
文件页数/大小: 12 页 / 509 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
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EVB72016  
433MHz FSK/ASK Transmitter  
Evaluation Board Description  
2.8 Mode Control Logic  
The mode control logic allows two different  
modes of operation as listed in the following  
table. The mode control pin EN is pulled-down  
internally. This guarantees that the whole circuit  
is shut down if this pin is left floating.  
EN  
0
Mode  
Description  
TX standby  
TX disabled  
1
TX active  
CKOUT active  
TX / CKOUT  
enabled  
2.9 Clock Output  
The clock output CKOUT is CMOS-compatible and can be used to drive a microcontroller. The frequency of  
the clock can be changed by the clock divider control signal CKDIV, that can be selected according to the  
following table. A capacitor at pin CKOUT can be used to control the clock voltage swing and the spurious  
emission.  
CKDIV  
Clock divider ratio  
Clock frequency / fc=433.92 MHz  
0
1
4
3.39 MHz  
848 kHz  
16  
2.10 Timing Diagrams  
After enabling the transmitter by the EN signal, the power amplifier remains inactive for the time ton, the  
transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output fre-  
quency within the time duration ton. After successful PLL lock, the LOCK signal turns on the power amplifier,  
and then the RF carrier can be FSK or ASK modulated.  
high  
EN  
low  
high  
EN  
low  
high  
high  
LOCK  
LOCK  
low  
low  
high  
high  
FSKDTA  
PSEL  
low  
low  
RF carrier  
t
t
t
t
on  
on  
Fig. 5: Timing diagrams for FSK and ASK modulation  
For more detailed information, please refer to the latest TH72016 data sheet revision.  
3901272016 01  
Rev. 004  
Page 6 of 12  
EVB Description  
June/07