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| 型号： | MICRF219AAYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 18/23页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER QWIKRADIO 16QSOP |
| 标准包装： | 98 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -112.5dBm |
| 调制或协议： | ASK，OOK |
| 应用： | 通用 |
| 电流 - 接收： | 4.3mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 配有 RSSI |
| 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 |
| 其它名称： | 576-3899-5 |
Micrel, Inc.
Crystal Selection
The crystal resonator provides a reference clock for all
the device internal circuits. Crystal tolerance needs to
be chosen such that the down-converted signal is
always inside the IF bandwidth of MICRF219A. From
this consideration, the tolerance should be ± 50ppm on
both the transmitter and the MICRF219A side. The ESR
should be less than 300 ? , and the temperature range of
the crystal should match the range required by the
application. With the Abracon crystal listed in the Bill of
Materials, a typical MICRF219A crystal oscillator still
starts up at 105oC with additional 400 ? series
resistance.
The oscillator of the MICRF219A is a Pierce-type
oscillator. Good care must be taken when laying out the
printed circuit board. Avoid long traces and place the
ground plane on the top layer close to the REFOSC pins
RO1 and RO2. When care is not taken in the layout, and
the crystals used are not verified, the oscillator may not
start or takes longer to start. Time-to-good-data will be
longer as well.
PCB Considerations and Layout
The MICRF219A evaluation board is a good starting
point for prototyping of most applications. The Gerber
files are downloadable from the Micrel website and
contain the remaining layers needed to fabricate this
board. When copying or making one’s own boards,
make the traces as short as possible. Long traces alter
the matching network and the values suggested are no
longer valid. Suggested matching values may vary due
to PCB variations. A PCB trace 100 mils (2.5mm) long
has about 1.1nH inductance. Optimization should always
be done with range tests. Make sure the individual
ground connection has a dedicated via rather then
sharing a few of ground points by a single via. Sharing
ground via will increase the ground path inductance.
Ground plane should be solid and with no sudden
interruptions. Avoid using ground plane on top layer next
to the matching elements. It normally adds additional
stray capacitance which changes the matching. Do not
use Phenolic materials as they are conductive above
200MHz. Typically, FR4 or better materials are
recommended. The RF path should be as straight as
MICRF219A
possible to avoid loops
and unnecessary turns.
Separate ground and V DD lines from other digital or
switching power circuits (such microcontroller…etc).
Known sources of noise should be laid out as far as
possible from the RF circuits. Avoid unnecessary wide
traces which would add more distribution capacitance
(between top trace to bottom GND plane) and alter the
RF parameters.
July 2011
18
M9999-071811-A
RadioTech@micrel.com or (408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF219AAYQS TR | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, 6mA, <10kbps, ASK Receiver with Auto-Poll, RSSI and Squelch (Recommended for New Designs) 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 |
| MICRF219AAYQS-TR | 功能描述:- RF Receiver ASK, OOK 300MHz ~ 450MHz -112.5dBm PCB, Surface Mount 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:300MHz ~ 450MHz 灵敏度:-112.5dBm 数据速率（最大值）:- 调制或协议:ASK，OOK 应用:通用 电流 - 接收:4.3mA 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特性:配有 RSSI 电压 - 电源:3 V ~ 3.6 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF219AYQS | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF219AYQS TR | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF220 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300MHz to 450MHz, 3.3V ASK/OOK Receiver with RSSI and Squelch |
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