参数资料
型号: MICRF405YML TR
厂商: Micrel Inc
文件页数: 20/46页
文件大小: 649K
描述: TRANSMITTER ASK/FSK 24-MLF
标准包装: 1
频率: 290MHz ~ 980MHz
应用: ISM
调制或协议: ASK,FSK
数据传输率 - 最大: 200 kbps
功率 - 输出: 10dBm
电流 - 传输: 18mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 2.2 V ~ 3.6 V
工作温度: -40°C ~ 125°C
封装/外壳: 24-VFQFN 裸露焊盘,24-MLF?
包装: 标准包装
产品目录页面: 571 (CN2011-ZH PDF)
其它名称: 576-1965-6
Micrel
MICRF405
 
 
 
 
April 2006 
20
M9999-041906
 (408) 955-1690
 
The frequency synthesizer consists of a voltage-
controlled   oscillator   (VCO),   crystal   oscillator,
prescaler, programmable frequency dividers, phase-
detector and charge pumps. Two different types of
prescalers are integrated, a pulse swallow and a
phase select prescaler. The recommended prescaler
is the phase select prescaler (Prescaler_Sel=0,
which is default). There is both a configurable on-
chip loop filter and an external loop filter. The
lengths of the N and M and A registers are 12, 12
and 6 bits respectively. The M, N and A values can
be calculated from the formula:
Phase select prescaler (Prescaler_Sel=0):
)
31
(
A
N
k
M
f
f
XCO
RF
+
?/DIV>
=
 
Pulse swallow prescaler (Prescaler_Sel=1):
)
2
32
(
A
N
k
M
f
f
XCO
RF
+
?/DIV>
=
,
 
 
where:
f
XCO
: Crystal oscillator frequency
f
RF
: RF frequency
0 < A d N
k: 6: RF frequency 290-325 MHz,
Freq_Band[1:0]=0
    4: RF frequency 430-490 MHz,
Freq_Band[1:0]=1
    2: RF frequency 860-980 MHz,
Freq_Band[1:0]=2-3
 
There are two sets of each of the divide factors (i.e.
A0 and A1). If modulation by using the dividers is
selected Modulation1=1, Modulation0=0), the two
sets   should   be   programmed   to   give   two   RF
frequencies, separated by two times the specified
single sided frequency deviation. For all other
modulation methods, the 0-set will be used. The
value of A is constrained to be less or equal to N,
0<=A<=N.
 
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