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| 型号： | MICRF008YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER 300-440MHZ 8-SOIC |
| 标准包装： | 2,500 |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -95dBm |
| 数据传输率 - 最大： | 4.8 kbps |
| 调制或协议： | OOK |
| 应用： | 车库门开启器 |
| 电流 - 接收： | 7mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 自动调谐 |
| 电源电压： | 4.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MICRF008YMTR MICRF008YMTR-ND |
Micrel, Inc.
Input Connector/Antenna
MICRF008
and the other is connected to ground as seen in Figure
Starting at J2, a SMA connector to connect to a RF
signal generator. Levels above –20dBm should be
avoided. An antenna pad is also provided. Solder a
8.
Halfwave-Dipole Antenna
piece of solid wire for the frequency of interest. See
one side connected to the RF input
one side connected to ground
Table 2 for 1/4 wavelength antennas. It should be noted
that 1/4 wavelength antennas work best ONLY with
ground planes of an equivalent size of the antenna. This
is not the case here since the board size is very small.
Figure 8. Halfwave-Dipole Antenna
Matching Network
Freq. (MHz)
315
390
418
433.92
ANT1 (mm)
231
185
173
168
ANT1 (inches)
9.1
7.3
6.8
6.6
Z1 to Z5 are used for the matching network. Not all parts
are used at the same time. Several types of matching
network can be implemented: T, π , or a L network. Here
a matching network has two purposes. The main
purpose is to match the antenna to the antenna pin. By
matching it is meant to reduce the loss there is between
two circuits; here the antenna being used or signal
[ mm ]
1 3 × 10 8 × 0.97 × 1000
[ inches ]
1 3 × 10 8 × 0.97 × 1000
Table 2. 1/4 Wave Antenna Lengths
The size of the antenna is calculated by the following
equation:
λ Ant =
4 f × 4
λ Ant =
4 f × 101 . 6
generator and the antenna pin. The secondary purpose
is to filter undesired signals, which will reduce the
receiver performance. Since it is a secondary function,
more filtering may be required, depending on the amount
of noise or adjacent signal interference present in the
antenna. A T-Network was chosen assuming that an 1/4
wavelength antenna is being used, which has
impedance close to 50 ? in free air or the receiver is
being connected to a RF signal generator that has
50 ? output impedance. By using the proper matching
where,
?
?
?
3 x 10 8 is the speed of light in vacuum in meter
per seconds.
0.97 is a correction factor for the difference
between electrical length and physical length
and varies depending on ground plane, and
objects next to the antenna.
f is the frequency of interest in Hertz.
elements, almost 9dB better sensitivity can be obtained.
There are several techniques used for impedance
matching. One frequently used is to plot impedance
values in the Smith Chart. However, one needs to know
the antenna impedance and the antenna pin impedance
in the MICRF008YM to perform the matching. Table 3
below shows the antenna pin input impedance versus
frequency and the matching elements needed to match
50 ? to the antenna pin.
1/4 wavelength antennas are good for initial tests, but
should never be used in a final product, unless the PCB
area has a large ground plane. Small ground planes
makes 1/4 wavelength monopole antennas unstable,
and any object close to the antenna changes its
impedance. It is completely useless if the antenna is not
straight up or if any object touches it. Other antennas,
Freq. (MHz)
315
390
418
433.92
ANT1 (mm)
231
185
173
168
ANT1 (inches)
9.1
7.3
6.8
6.6
such as half-wave dipole, or 1/8 wavelength monopole
are better solutions for small ground planes. A 1/8
Note 1.
All inductors used are Coilcraft 0603 size, and the capacitors
are Vishay COG 5%. Z3 and Z5 are not used.
wavelength antenna has approximately half the size of a
1/4 wavelength antenna, which makes it very attractive
for small designs. The 1/8 wavelength antenna is not as
sensitive to proximity effects as the 1/4 wavelength
antenna. However, the 1/8 wavelength antenna has a
reactive element in its impedance that needs to be taken
into account in the matching network. The halfwave
dipole has a size approximately double the 1/4
wavelength and does not require a large ground plane.
One side of the antenna is connected to the RF input
Table 3. Antenna Input, Frequency and Matching Values
August 2008
10
M9999-080108
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相关代理商/技术参数 |
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| MICRF009 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:QwikRadio Low-Power UHF Receiver |
| MICRF009BM | 功能描述:IC RECEIVER UHF LOW POWER 16SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| MICRF009BM TR | 功能描述:IC RCVR UHF 300-440MHZ 16-SOIC RoHS:否 类别:RF/IF 和 RFID >> RF 接收器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS 产品变化通告:Product Discontinuation 09/Jan/2012 标准包装:50 系列:* 频率:850MHz ~ 2.175GHz 灵敏度:- 数据传输率 - 最大:- 调制或协议:- 应用:* 电流 - 接收:* 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特点:- 电源电压:4.75 V ~ 5.25 V 工作温度:0°C ~ 85°C 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| MICRF009YM | 功能描述:射频接收器 300-440MHz High Sensitivity Receiver( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| MICRF009YM TR | 功能描述:射频接收器 300-440MHz High Sensitivity Receiver( Lead Free) RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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