參數(shù)資料
型號(hào)： MICRF405YML TR
廠商： Micrel Inc
文件頁(yè)數(shù)： 31/46頁(yè)
文件大?。?/td> 649K
描述： TRANSMITTER ASK/FSK 24-MLF
標(biāo)準(zhǔn)包裝： 1
頻率： 290MHz ~ 980MHz
應(yīng)用： ISM
調(diào)制或協(xié)議： ASK，F(xiàn)SK
數(shù)據(jù)傳輸率 - 最大： 200 kbps
功率 - 輸出： 10dBm
電流 - 傳輸： 18mA
數(shù)據(jù)接口： PCB，表面貼裝
天線連接器： PCB，表面貼裝
電源電壓： 2.2 V ~ 3.6 V
工作溫度： -40°C ~ 125°C
封裝/外殼： 24-VFQFN 裸露焊盤(pán)，24-MLF?
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 571 (CN2011-ZH PDF)
其它名稱： 576-1965-6
Micrel
MICRF405
 
 
 
 
April 2006 
31
M9999-041906
 (408) 955-1690
 
The two first blocks are generating a clock for the
modulator. This clock is, together with the user data,
used to control a charge pump. The charge pump
current is controlled by a DAC. Each time the input
data changes state, a charge is then injected into
the capacitor to generate a modulation signal. The
charge magnitude is controlled by the charging
current and by charging time (inversely proportional
with modulator clock). To be able to achieve small
deviations, it is possible to attenuate the modulation
signal. Finally, the signal is filtered to narrow
transmitter output spectrum.
The procedure is first to determine the settings
concerning the data bit rate, then, these values will
be used in the calculation of the frequency deviation.
Finally, the user must see if the desired values
cause the modulator to saturate.
Deviation Setting
Deviation controlled by user parameters FSKClk_K,
MOD_I,   and   MOD_A,   together   with   physical
parameters fXTAL and KVCO. All user parameters
can be set in software, and fXTAL (crystal oscillator
frequency) is set when designing in the radio chip.
KVCO (VCO gain) is a parameter of the radio chip,
and is not controllable by the user.
The crystal oscillator frequency, fXTAL, is divided by
FSKClk_K to generate the modulator clock. Since
this modulator clock is controlling the rise and fall
times for the modulator, the frequency deviation is
inversely proportional to this clock. The relationship
is shown in equation (3):
XTAL
DEV
f
FSKClk_K
f

 
(3)
It is assumed that FSKClk_K will be constant for
most applications to keep bit-rate and shaping
constant, although this is not a requirement.
The primary two controls of frequency deviation are
MOD_I and MOD_A. Of these two, MOD_I is the
parameter that controls the signal generation, while
MOD_A controls attenuation of this signal. The
reason for using an attenuator is to be able to
generate   small   deviations   at   high   values   of
FSKClk_K. The relationship is shown in equation
(4). 
A
MOD
DEV
I
MOD
f
_
2
_

 
(4)
Finally, the VCO gain is given by equation (5). 
(
)
(
)
FreqBand
FreqBand
f
Const
Const
K
C
VCO


?/DIV>
?/DIV>
+
=
3
3
2
1
(5)
where:
Const1
9
10
6324
.
30
?/DIV>

 
Const2     7
.
54   
fC: Carrier frequency of the radio.
FreqBand: Frequency band.
     0: 315MHz,
     1: 433MHz and
     2: 900MHz.
In equation (5), it is evident that the VCO gain is
dependent of carrier frequency. MOD_I is probably
the best parameter to alter if counteracting this effect
if necessary.
Combining equations (3), (4), and (5) gives us an
expression for the frequency deviation:
(
)
(
)
FreqBand
FreqBand
f
Const
Const
I
MOD
f
f
C
A
MOD
XTAL
DEV


?/DIV>
?/DIV>
+
?/DIV>
?/DIV>
=
3
3
2
_
FSKClk_K
2
1
_
(6)
Observe   that   equation   (6)   gives   single-sided-
deviation. Peak-to-peak deviation is twice this value.
Shaping
The modulation waveform will be shaped due to the
charging   and   discharging   of   a   capacitor.   The
waveform looks like a Gaussian filtered signal with a
Bandwidth臥eriod-product, BT, given by:
FSKn
BT   2
=
 
(7)
where:
BT: Shaping factor.
It is evident from this that a low FSKn gives a low
shaping factor, and is thus preferred if it is possible
to choose FSKn freely.
In addition to this, it is possible to smooth the
modulator output in a programmable low-pass filter.
This filter is controlled by the parameter MOD_F.
The parameter should be set according to equation
(8).
BR
F
MOD
3
10
150
_
?/DIV>
d
 
(8)
Modulator Saturation
The modulator output voltage is generated by a
capacitor that is being charged. This means that
there is a risk of saturating the modulator if the
charge received by the capacitor is too large. Use
equation (9) to determine the maximum value of
MOD_I that can be used.
1
10
28
_
6
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
d

FSKClk_K
f
I
MOD
XTAL
 
(9)
If it turns out that the MOD_I-range is too small for
your   requirements,   try   increasing   FSKn   and
decreasing FSKClk_K accordingly.
 
相關(guān)PDF資料
PDF描述
MTX-102-433DR-B MODULE TRANSMITTER 433MHZ 18DIP
MTX-103-915DR-B MODULE TRANSMITTER 915MHZ 18DIP
MTX-405-433DR-B MODULE TRANSMITTER 433MHZ 24DIP
N50P105 IC MODULE MINI JOYSTICK SMD
OCB350L187Z BOARD CALIBR CIRCUIT OPB350L187
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MICRF500 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:700MHz to 1.1GHz RadioWire RF Transceiver
MICRF500BLQ 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:700MHz to 1.1GHz RadioWire RF Transceiver
MICRF500BLQ TR 功能描述:射頻接收器 700-1000MHz, 3.0V, FSK, FH Transceiver RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel
MICRF500BLQTR 功能描述:TXRX UHF 700-1100MHZ 44-LQFP RoHS:否 類別:RF/IF 和 RFID >> RF 收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數(shù)據(jù)傳輸率 - 最大:54Mbps 調(diào)制或協(xié)議:* 應(yīng)用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲(chǔ)容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤(pán) 包裝:管件
MICRF500EVAL1 功能描述:射頻開(kāi)發(fā)工具 MICRF500 Evaluation Kit - For experimental use only RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評(píng)估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*