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参数资料
| 型号： | MRF89XA-I/MQ |
| 厂商： | Microchip Technology |
| 文件页数： | 101/140页 |
| 文件大小： | 0K |
| 描述： | TXRX ISM SUB-GHZ ULP 32QFN |
| 标准包装： | 73 |
| 系列： | * |
| 频率： | 863MHz ~ 870MHz，902MHz ~ 928MHz，950MHz ~ 960MHz |
| 数据传输率 - 最大： | 200kbps |
| 调制或协议： | FSK，OOK |
| 应用： | ISM |
| 功率 - 输出： | 12.5dBm |
| 灵敏度： | -113dBm |
| 电源电压： | 2.1 V ~ 3.6 V |
| 电流 - 接收： | 3mA |
| 电流 - 传输： | 25mA |
| 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-WFQFN 裸露焊盘 |
| 包装： | 托盘 |
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MRF89XA
4.8 General PCB Layout Design
The following guidelines can be used to assist in high-
frequency PCB layout design.
The printed circuit board is usually comprised of two or
four basic FR4 layers.
The two-layer printed circuit board has mixed signal/
power/RF and common ground routed in both the lay-
ers (see Figure 4-8 ).
The four-layer printed circuit board (see Figure 4-9 ) is
comprised of the following layers:
? Signal layout
? Thorough decoupling on each power pin is
beneficial for reducing in-band transceiver noise,
particularly when this noise degrades performance.
Usually, low value caps (27-47 pF) combined with
large value caps (100 nF) will cover a large
spectrum of frequency.
? Passive component (inductors) should be in the
high-frequency category and the Self-Resonant
Frequency (SRF) should be at least two times
higher than the operating frequency.
? The additional trace length affects the crystal
oscillator by adding parasitic capacitance to the
overall load of the crystal. To minimize this, place
?
?
RF ground
Power line routing
the crystal as close as possible to the RF device.
? Setting short and direct connections between the
? Common ground
The following guidelines explain the requirements of
the previously mentioned layers:
? It is important to keep the original PCB thickness,
because any change will affect antenna perfor-
mance (see total thickness of dielectric) or
microstrip lines’ characteristic impedance.
? For good transmit and receive performance, the
trace lengths at the RF pins must be kept as short
as possible. Using small, surface mount compo-
nents (in 0402/0603 package) yields good perfor-
mance and keeps the RF circuit small. RF
connections should be short and direct.
? Except for the antenna layout, avoid sharp corners
because they can act as an antenna. Round corners
will eliminate possible future EMI problems.
? Digital lines are prone to be very noisy when han-
dling periodic waveforms and fast clock/switching
rates. Avoid RF signal layout close to any of the
digital lines.
? A VIA filled ground patch underneath the IC
transceiver is mandatory.
? The power supply must be distributed to each pin in
a star topology, and low-ESR capacitors must be
placed at each pin for proper decoupling noise.
components on board minimizes the effects of
“frequency pulling” that might be introduced by stray
capacitance. It even allows the internal load capaci-
tance of the chip to be more effective in properly
loading the crystal oscillator circuit.
? Long run tracks of clock signal may radiate and
cause interference. This can degrade receiver per-
formance and add harmonics or unwanted
modulation to the transmitter.
? Keep clock connections as short as possible and
surround the clock trace with an adjacent ground
plane pour. Pouring helps in reducing any radiation
or crosstalk due to long run traces of the clock
signal.
? Low value decoupling capacitors, typically 0.01-0.1
μF, should be placed for V DD of the chip and for bias
points of the RF circuit.
? High value decoupling capacitors, typically 2.2-10
μF, should be placed at the point where power is
applied to the PCB.
? Power supply bypassing is necessary. Poor bypass-
ing contributes to conducted interference, which can
cause noise and spurious signals to couple into the
RF sections, significantly reducing the performance.
FIGURE 4-8:
TWO BASIC COPPER FR4 LAYERS
Signal/Power/RF and
Common Ground
Dielectric Constant = 4.5
Signal/Power/RF and
Common Ground
? 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 101
相关PDF资料 |
PDF描述 |
|---|---|
| MRF89XAM9A-I/RM | IC TXRX MOD 915MHZ ULP SUB-GHZ |
| MRX-001-433DR-B | MODULE RECEIVER 433MHZ 18DIP |
| MRX-002-433DR-B | MODULE RECEIVER 433MHZ 18DIP |
| MRX-002SL-433DR-B | MODULE RCVR 433MHZ SAW LN 24DIP |
| MRX-005-915DR-B | MODULE RECEIVER 915MHZ 18DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MRF89XAM8A-I | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver |
| MRF89XAM8A-I/RM | 功能描述:射频模块 868MHz Sub-GHz transceiver module RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
| MRF89XAM8A-I/RM | 制造商:Microchip Technology Inc 功能描述:, Leaded Process Compatible:Yes, Peak Re |
| MRF89XAM9A_12 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:915 MHz Ultra Low-Power Sub-GHz Transceiver Module |
| MRF89XAM9A-I/RM | 功能描述:射频模块 915MHz Sub-GHz Transceiver Mod RoHS:否 制造商:Linx Technologies 产品:Transceiver Modules 频带:902 MHz to 928 MHz 输出功率:- 15.5 dBm to + 12.5 dBm 接口类型:UART 工作电源电压:- 0.3 VDC to + 5.5 VDC 传输供电电流:38.1 mA 接收供电电流:22.7 mA 天线连接器类型:U.FL 最大工作温度:+ 85 C 尺寸:1.15 mm x 0.63 mm x 0.131 mm |
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