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参数资料
| 型号： | MICRF221AYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC RF RECEIVER QWIKRADIO 16-QSOP |
| 标准包装： | 98 |
| 频率： | 50MHz ~ 950MHz |
| 灵敏度： | -109dBm |
| 数据传输率 - 最大： | 10 kbps |
| 调制或协议： | ASK，OOK |
| 电流 - 接收： | 9.3mA |
| 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 ~ 85°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： | 576-3230-5 |
Micrel Inc.
Matching Calculations
Capacitor C3 and inductor L2 form the L-shaped
matching network. The capacitor provides additional
attenuation for low frequency outside band noise and
the inductor provides additional ESD protection for the
antenna pin. Two methods can be used to find these
values, which are matched close to 50 ? . One method
calculates the values using the equations below, and
another by using a Smith chart. The Smith chart is
made easier by using software that plots the values of
the components C3 and L2, such as WinSmith by
Noble Publishing.
To calculate matching values, you need to know the
input impedance of the device. Table 3 shows the
input impedance of the MICRF221 receiver and
suggested matching values for the most used
frequencies. These suggested values may be different
if your layout is different from the layout for the
QR221BPF evaluation board.
MICRF221
Freq (MHz)
C3 (pF)
L2(nH)
Z device ( ? )
868.35
915.0
916.5
1.2
1.2
1.2
9.5, Coilcraft
8.7, Coilcraft
8.7, Coilcraft
9.4-j71.8
9.0-j67.4
8.5-j68.0
Figure 6. Device’s Input Impedance, Z = 9.0 – j67.4 ?
Because stray parasitic elements can be caused by
both the printed circuit board as well as the
components themselves, the values plotted are
Table 3. Matching Values for the Most Used
Frequencies
For the frequency of 915.0MHz, the input impedance
is Z = 9.0-j67.4 ? . The matching components are
calculated by:
Equivalent parallel = B = 1/Z = 1.95 + j14.6 msiemens
slightly different from the calculated ones. Therefore,
one plots the shunt inductor (8.7nH, from Coilcraft)
and the series capacitor (1.2pF) for the desired input
impedance (Figure 7). One can then see the matching
leading to the center of the Smith Chart or close to
50 ? .
Rp = 1 / Re (B);
Xp = 1 / Im (B)
Rp = 513 ? ; Xp = 68.5 ?
Q = SQRT (Rp/50 + 1)
Q = 3.35
Xm = Rp / Q
Xm = 153.1 ?
Resonance Method For L-shape Matching Network:
Lc = Xp / (2×Pi×f);
Lp = Xm / (2×Pi×f)
L2 = (Lc×Lp) / (Lc + Lp); C3 = 1 / (2×Pi×f×Xm)
L2 = 8.2nH
C3 = 1.14pF
Doing the same calculation, example with the Smith
Chart, it would appear as follows:
First, plot the input impedance of the device
(Z = 9.0 – j67.4) ? @ 915.0MHz.(Figure 6).
October 2008
13
M9999-100108
(408) 955-1690
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| MICRF221AYQS TR | 功能描述:射频接收器 850MHz to 950MHz, 3.0V to 3.6V, 9mA, 10kbps ASK Recdeiver with Auto-Poll and 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 |
| MICRF229YQS-T5 | 功能描述:- RF Receiver ISM 433.92MHz -112dBm 20kbps On-Board, Trace 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:433.92MHz 灵敏度:-112dBm 数据速率（最大值）:20kbps 调制或协议:ISM 应用:通用 电流 - 接收:6mA 数据接口:- 存储容量:- 天线连接器:板载，跟踪 特性:- 电压 - 电源:3.5 V ~ 5.5 V 工作温度:-40°C ~ 105°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF229YQS-TR | 功能描述:- RF Receiver ISM 433.92MHz -112dBm 20kbps On-Board, Trace 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:433.92MHz 灵敏度:-112dBm 数据速率（最大值）:20kbps 调制或协议:ISM 应用:通用 电流 - 接收:6mA 数据接口:- 存储容量:- 天线连接器:板载，跟踪 特性:- 电压 - 电源:3.5 V ~ 5.5 V 工作温度:-40°C ~ 105°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF230YQS-T5 | 功能描述:- RF Receiver ISM 433.92MHz -112dBm 20kbps On-Board, Trace 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:433.92MHz 灵敏度:-112dBm 数据速率（最大值）:20kbps 调制或协议:ISM 应用:通用 电流 - 接收:6mA 数据接口:- 存储容量:- 天线连接器:板载，跟踪 特性:- 电压 - 电源:3.5 V ~ 5.5 V 工作温度:-40°C ~ 105°C 封装/外壳:16-LSSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
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