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| 型号： | MICRF405YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 30/46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 |
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Micrel
MICRF405
April 2006
30
M9999-041906
(408) 955-1690
Bit Rate Settings
The bit rate is set separately for ASK and FSK
modulation to support ASK modulation with FSK
spreading. The FSK bit rate is set with the two
parameters FSKClk_K and FSKn. The relationship is
FSKn
XTAL
K
FSKClk
f
BR
+
?/DIV>
=
3
2
_
(1)
where:
BR: Bit rate.
fXTAL: Crystal oscillator frequency.
FSKClk_K: Integer in the range [1..63] (6 bit).
FSKn: Integer in the range [0..5] (3 bit).
A procedure to find the settings for the desired bit
rate is described below:
1. Set FSKn to 0.
2. Calculate FSKClk_K by using this formula:
FSKn
XTAL
BR
f
K
FSKClk
+
?/DIV>
=
3
2
_
3. If FSKClk_K is too high, increment FSKn by
one, and then jump to 2.
In some cases, several combinations of FSKClk_K
and FSKn will give the bit rate. If VCO modulation is
selected, Modulation[1:0] < 2, then the lower FSKn
the better shaping of the signal. However in some
cases, low FSKn causes the modulator to saturate
(Please see the section Modulator for details). When
Manchester encoding is enabled, Manchester_en=1,
FSKn needs to bigger than zero for the modulator to
operate properly.
When sending ASK with FSK spreading, FSKClk_K
and FSKn set the speed of the FSK spreading.
The bit rate of the ASK is set similar with the two
parameters ASKClk_K and ASKn. The relationship
is now:
ASKn
XTAL
K
ASKClk
f
BR
+
?/DIV>
=
5
2
_
(2)
where the new parameters are:
ASKClk_K: Integer in the range [1..63] (6 bits).
ASKn: Integer in the range [0..3] (2 bits).
A procedure for finding a bit rate will be equal to
FSK, but with this formula:
ASKn
XTAL
BR
f
K
ASKClk
+
?/DIV>
=
5
2
_
Due to the high flexibility of the modulator, a brief
explanation of how it works will ease the use of it.
Figure 15 shows a block diagram of the components
of the modulator.
Modulator
Adr
Data
A6..A0
D7
D6
D5
D4
D3
D2
D1
D0
0001110
Mod_I4=0
Mod_I3=1
Mod_I2=0
Mod_I1=0
Mod_I0=1
Mod_A2=0
Mod_A1=1
Mod_A0=1
0001111 VCO_Fr_Chk=0 VCO_Fr_Auto=0
FSKn2=1
FSKn1=0
FSKn0=0
Mod_F2=1
Mod_F1=0
Mod_F0=0
0010000 MOD_TEST1=0 Prescaler_Sel=0 FSKClk_K5=1 FSKClk_K4=1 FSKClk_K3=0 FSKClk_K2=1 FSKClk_K1=0 FSKClk_K0=0
Figure 15. Modulator Block Diagram.
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