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参数资料
| 型号： | MICRF505BML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 21/42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
Switched Capacitor Filter
MICRF505BML/YML
Baudrate: The baud rate given is bit/sec
A6..A0
0001000
D7
‘1’
D6
‘1’
D5
ScClk5
D4
ScClk4
D3
ScClk3
D2
ScClk2
D1
ScClk1
D0
ScClk0
RSSI
The main channel filter is a switched-capacitor
A6..A0
0000001
D7
Modulation1
D6
Modulation0
D5
‘0’
D4
‘0’
D3
RSSI_en
D2
LD_en
D1
PF_FC1
D0
PF_FC0
implementation of a six-pole elliptic low pass filter.
The elliptic filter minimized the total capacitance
required for a given selectivity and dynamic range.
The cut-off frequency of the switched-capacitor filter
is adjustable by changing the clock frequency.
The clock frequency is designed to be 20 times the
cut-off frequency. The clock frequency is derived
from the reference crystal oscillator. A
2.2
2
1.8
1.6
1.4
1.2
1
RSSI
33kohm, 1nF, 125kbps, BW=200kHz, Vdd=2.5V
programmable 6-bit divider divides the frequency of
the crystal oscillator. To generate the correct non-
overlapping clock-phases needed by the filter this
0.8
0.6
-125
-115
-105
-95
-85
-75
Pin [dBm]
-65
-55
-45
-35
-25
frequency is then divided by 4. The cut-off frequency
of the filter is given by:
Figure 13. RSSI Voltage
f CUT =
f XCO
40 ? ScClk
Pin 14
RSSI
RSSI
f CUT : Filter cutoff frequency
f XCO : Crystal oscillator frequency
ScClk: Switched capacitor filter clock, bits
ScClk5-0
For instance, for a crystal frequency of 16MHz and if
R2
33k
C10
1nF
100kHz. 1 order RC low pass filters are connected
the 6 bit divider divides the input frequency by 4 the
cut-off frequency of the SC filter is 16MHz/(40 x 4) =
st
to the output of the SC filter-to-filter the clock
frequency.
The lowest cutoff frequency in the pre- and the main
channel filter must be set so that the received signal
is passed with no attenuation, which is frequency
deviation plus modulation. If there are any frequency
offset between the transmitter and the receiver, this
must also be taken into consideration. A formula for
the receiver bandwidth can be summarized as
follows:
f BW = + f OFFSET + f DEV + Baudrate / 2
where
f BW : Needed receiver bandwidth, fcut above
should not be smaller than f BW [Hz]
f OFFSET : Total frequency offset between
receiver and transmitter [Hz]
f DEV : Single-sided frequency deviation, see
chapter Modulator on how to calculate [Hz]
Figure 14. RSSI Network
A Typical plot of the RSSI voltage as function of
input power is shown in Figure 13. The RSSI has a
dynamic range of about 50dB from about -110dBm
to -60dBm input power.
The RSSI can be used as a signal presence
indicator. When a RF signal is received, the RSSI
output increases. This could be used to wake up
circuitry that is normally in a sleep mode
configuration to conserve battery life.
Another application for which the RSSI could be
used is to determine if transmit power can be
reduced in a system. If the RSSI detects a strong
signal, if could tell the transmitter to reduce the
transmit power to reduce current consumption.
October 2006
21
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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