参数资料
型号: XE1205SKC433XE1
厂商: Semtech
文件页数: 21/48页
文件大小: 0K
描述: KIT STARTER FOR XE1205 433MHZ
标准包装: 1
系列: TrueRF™
类型: 收发器,ISM
频率: 433MHz
适用于相关产品: XE1205(433MHz)
已供物品: 板,模块,天线,电池,线缆,CD
产品目录页面: 584 (CN2011-ZH PDF)
XE1205
5.4
FREQUENCY SYNTHESIZER
The Frequency Synthesizer generates the local oscillator (LO) signal for the receiver section as well as the continuous
phase FSK (CPFSK) modulated signal for the transmitter section. The core of the synthesizer is implemented with a
Sigma-Delta PLL architecture. The frequency is programmable with a step-size of 500 Hz in the 433, 868 and 915 MHz
frequency bands. This block includes a crystal oscillator which provides the frequency reference for the PLL. This
reference frequency can also be used as a reference clock for the external microcontroller on the CLKOUT pin.
5.4.1
Clock Output for an external processor
A reference clock can be generated for use by an external microcontroller. The OSCParam_Clkout configuration bit
controls the CLKOUT pin. When set to high, CLKOUT is enabled, otherwise it is disabled. The output frequency at
CLKOUT is defined by the value of the OSCParam_Clkout_freq(2:0) parameter. The output frequency at CLKOUT is the
reference oscillator frequency divided by 2, 4, 8, 16 or 32. With a reference oscillator frequency of 39 MHz this provides
a reference clock at 19.5 MHz, 9.75 MHz, 4.87 MHz, 2.44 MHz or 1.22 MHz, respectively.
This clock signal is disabled in Sleep Mode.
? Semtech 2008
21
www.semtech.com
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