- 您现在的位置：买卖IC网 > Datasheet目录477 > MICRF505DEV1 (Micrel Inc)KIT DEV RADIOWIRE 850-950MHZ Datasheet资料下载
参数资料
| 型号： | MICRF505DEV1 |
| 厂商： | Micrel Inc |
| 文件页数： | 26/42页 |
| 文件大小： | 0K |
| 描述： | KIT DEV RADIOWIRE 850-950MHZ |
| 标准包装： | 1 |
| 系列： | RadioWire® |
| 类型： | 收发器，ISM |
| 频率： | 850MHz ~ 950MHz |
| 适用于相关产品： | MICRF505 |
| 已供物品： | 2 个板，电池，线缆，CD |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
| 其它名称： | 576-1606 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
Micrel
Modulator
MICRF505BML/YML
A6..A0
0000100
0000101
0000110
0000111
D7
Mod_F2
-
-
BitRate_clkS1
D6
Mod_F1
-
Mod_clkS2
BitRate_clkS0
D5
Mod_F0
‘0’
Mod_clkS1
RefClk_K5
D4
Mod_I4
‘1’
Mod_clkS0
RefClk_K4
D3
Mod_I3
Mod_A3
BitSync_clkS2
RefClk_K3
D2
Mod_I2
Mod_A2
BitSync_clkS1
RefClk_K2
D1
Mod_I1
Mod_A1
BitSync_clkS0
RefClk_K1
D0
Mod_I0
Mod_A0
BitRate_clkS2
RefClk_K0
The modulator will create a waveform with
programmable amplitude and frequency. This
waveform is fed into a modulation varactor in the
VCO, which will create the desired frequency
modulation. The frequency spectrum can be
narrowed by increasing the rise-and fall times of the
waveform.
The modulator waveform is created by charging and
discharging a capacitor. A modulator clock controls
the timing, as shown in Figure19. For every rise-and
fall edge, 4 clock periods are being used. The
charging current during these 4 clock periods are not
equal, this is to reduce the high frequency
components in the waveform, which in turn will
narrow the frequency spectrum.
The frequency deviation can be set in three different
ways, as will be explained below. A formula for
setting the desired deviation is given at the end of
this chapter.
Modulator Clock
Modulator Waveform
Figure 19. Modulator Waveform and Clock
Modulator Clock
M od_clk a
Mod_clkb
Mod_clkb > Mod_clka
Figure 20. Two Different Modulator Clock Setting
A f MOD_CLK of 8 times the bit rate (as in Figure 20)
corresponds to a signal filtered in a Gaussian filter
with a Bandwidth Period product (BT) of 1. When BT
is increased, the waveform will be less filtered.
Minimum BT is 1 (f MOD_CLK is 8 times the bitrate).
Figure 20 shows two waveforms with BT=1 and
BT=2, i.e. the f MOD_CLK is 8 and 16 times higher than
the bit rate. When changing the BT factor, the
charge-and discharge times will also be changed,
and therefore the frequency deviation, as shown in
Figure 20.
Modulator Current
The current used during the rise- and fall times can
be programmed with the Mod_I4..Mod_I0 bit, the
last one being LSB. Figure 21 shows two waveforms
generated with two different currents, where
Mod _ Ia > Mod _ Ib . Higher current will give a
higher frequency deviation and vice versa. The
effect of modulator clock and MOD_I is illustrated by:
The modulator clock frequency is set by:
f DEVIATION ∝
MOD_I
f MOD_CLK
f MOD_CLK =
f XCO
Refclk_K ? 2 (7 ? Mod_clkS )
To avoid saturation in the modulator it is important
not to exceed maximum Mod_I. Maximum Mod_I for
MOD_I MAX = INT(f MOD_CLK ? 28 × 10 )-1
where f MOD_CLK is the modulator clock shown in
Figure 19, f XCO is the crystal oscillator frequency
Refclk_K is a 6 bit number and Mod_clkS is a 3 bit
number. Mod_clkS can be set to a value between 0
and 7. The modulator clock frequency should be set
according to the bit rate and shaping.
a given f MOD_CLK is given by:
-6
where INT() returns the integer part of the argument.
October 2006
26
M9999-103106
+1 408-944-0800
相关PDF资料 |
PDF描述 |
|---|---|
| MICRF506DEV1 | EVAL BOARD EXPERIMENTAL MICRF506 |
| MICRF507YML TR | TXRX FSK LOW PWR W/AMP 32MLF |
| MICRF600DEV1 | KIT DEV RADIOWIRE 902-928MHZ |
| MK01-C | SENSOR REED SPST-NO SMD |
| MK01-H | SENSOR REED SPDT-CHANGE SMD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF505DEV1 | 制造商:Micrel Inc 功能描述:KIT MICRF505 EVALUATION |
| MICRF505L | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:850MHz and 950MHz ISM Band Transceiver |
| MICRF505LYML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MICRF505LYML TR | 功能描述:射频收发器 850MHz to 950MHz, 2.25V to 5.5V FSK Transceiver with +10dBm Power Amplifier RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| MICRF505YML | 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER SMD MLF32 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER, SMD, MLF32 制造商:Micrel Inc 功能描述:433/915MHZ ITRANSCEIVER, SMD, MLF32; Frequency Min:850MHz; Frequency Max:950MHz; Modulation Type:FSK; Sensitivity dBm:-111dBm; Data Rate:200Kbps; Supply Voltage Min:2V; Supply Voltage Max:2.5V; RF IC Case Style:MLF; No. of Pins:32; ;RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。