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参数资料
| 型号： | MICRF505BML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 26/42页 |
| 文件大小： | 0K |
| 描述： | TXRX ISM 868-915MHZ 32-MLF |
| 标准包装： | 1,000 |
| 频率： | 850MHz ~ 950MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK |
| 应用： | 遥测，无线控制器 |
| 功率 - 输出： | 10dBm |
| 灵敏度： | -111dBm |
| 电源电压： | 2.3 V ~ 5.5 V |
| 电流 - 接收： | 13.5mA |
| 电流 - 传输： | 28mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，32-MLF? |
| 包装： | 带卷 (TR) |
| 其它名称： | MICRF505BMLTR MICRF505BMLTR-ND |
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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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF505DEV1 | 功能描述:射频开发工具 MICRF505 Evaluation Kit - For experimental use only RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| 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 |
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