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参数资料
| 型号： | MICRF213AYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC RX 3.3V 300-350 MHZ 16-QSOP |
| 标准包装： | 98 |
| 频率： | 300MHz ~ 350MHz |
| 灵敏度： | -110dBm |
| 数据传输率 - 最大： | 7.2 kbps |
| 调制或协议： | AM，OOK |
| 应用： | ISM，车库门开启器，RKE |
| 电流 - 接收： | 3.9mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
| 其它名称： | 576-1649-5 |
Micrel, Inc.
Please keep in mind that these suggested values may
MICRF213
Second, we plot the shunt inductor (68nH) and the
be different if the layout is not exactly the same as the
series
capacitor
(1.8pF)
for the desired
input
one depicted here.
impedance (Figure 5). We can see the matching
Freq (MHz)
303.825
315
345
C3 (pF)
1.8
1.8
1.8
L2 (nH)
72
68
56
Z device ( ? )
34.6– j245.1
32.5 – j235
25.3 – j214
leading to the center of the Smith Chart or close to
50 ? .
Table 4. Matching Values for the
Most Used Frequencies
For the frequency of 315MHz, the input impedance is
Z = 32.5 – j235 ? , then the matching components are
calculated by:
Equivalent parallel = B = 1/Z = 0.577 + j4.175
msiemens
Rp = 1 / Re (B);
Rp = 1.733 k ? ;
Xp = 1 / Im (B)
Xp = 239.5 ?
Q = SQRT (Rp/50 + 1)
Q = 5.972
Xm = Rp / Q
Xm = 290.21 ?
Resonance Method For L-shape Matching Network
Lc = Xp / (2.Pi.f);
L2 = (Lc.Lp) / (Lc + Lp);
Lp = Xm / (2.Pi.f)
C3 = 1 / (2.Pi.f.Xm)
L2 = 66.3nH
C3 = 1.74pF
Doing the same calculation example with the Smith
Chart, it would appear as follows,
First, we plot the input impedance of the device,
(Z = 32.5 – j235) ? @ 315MHz.(Figure 4).
Figure 5. Plotting the Shunt Inductor
and Series Capacitor
Crystal Y1 or Y1A (SMT or leaded respectively) is the
reference clock for all the device internal circuits.
Desired
crystal
characteristics
are:
10pF load
capacitance, 30ppm, ESR < 50 ? and a -40oC to
+105oC temperature range. Table 5 shows the crystal
frequencies and one of Micrel’s approved crystal
manufactures (www.hib.com.br).
Figure 4. Device’s Input Impedance, Z = 32.5 – j235 ?
The oscillator of the MICRF213 is a Colpitts type. It is
very sensitive to stray capacitance loads. Thus, very
good care must be taken when laying out the printed
circuit board. Avoid long traces and ground plane on
May 2007
9
M9999-052307-A
(408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF213AYQS TR | 功能描述:射频接收器 300MHz to 350MHz, 3.0V to 3.6V, 7.2kbps, 4mA, ASK Receiver with RSSI, Shutdown in 16-Lead QSOP (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 |
| MICRF218 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver |
| MICRF218_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver |
| MICRF218AYQS | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, <10kbps, 4mA, Wide-IF Bandwidth ASK Receiver with RSSI, Shutdown in 16-Lead QSOP 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 |
| MICRF218AYQS TR | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, <10kbps, 4mA, Wide-IF Bandwidth ASK Receiver with RSSI, Shutdown in 16-Lead QSOP 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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