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| 型号： | MICRF008YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/13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.
SEL0 Pin – Setting the Demodulator Bandwidth
The SEL0 pin sets the demodulator bandwidth. When
the pin is connected to ground the demodulator
bandwidth is set to its minimum. When the pin is left
floating (internal pull-up) or connected to VDD, the
demodulator bandwidth is set to its maximum. The
demodulator bandwidth is a function of the RF frequency
used. See Table 7 for the most common frequency used
versus the demodulator bandwidth.
RF Carrier Frequency (MHz)
MICRF008
Data Squelching
Data squelching can be achieved by software or
hardware. The software squelch is preferred over
hardware squelch for it is more flexible, reliable, lower
cost over manufacturing, etc. However, it takes time and
resources to develop any software. If one needs a
squelch function, a resistor can be used in the C TH pin.
R1 and R2 are in the test circuit for this purpose. Either
one of them can be used or both. If only one resistor is
used, the value of the resistor should be chosen
according to the amount of squelch needed and if the
SEL0
0
1
315
1.6kHz
3.6kHz
390
2.0kHz
4.0kHz
418
2.2kHz
4.4kHz
433.92
2.4kHz
4.8kHz
DO pin needs to be sitting high or low without an RF
income signal. Values from 10M ? and below can be
used. When both resistors are used, a more accurate
control can be achieved for the squelch function.
Table 7. Demodulator Bandwidth
To determine what is the demodulator bandwidth
required for the application, the absolute minimum pulse
width used in the encoder transmitted signal needs to be
found. The data pattern has several different types of
pulse width depending what data format is being used
(NRZ, Manchester, PWM, etc). The minimum pulsewidth
is the shortest pulse in the output of the encoder being
sent to the transmitter input measured during one bit
time when the signal is high. See Figure 9 below for
clarification.
Shortest
bit period = 1/data rate pulsewidth
The drawbacks using these resistors are: loss in receiver
sensitivity, reduced demodulator bandwidth, and the C TH
capacitor equation will not work. As a result, C TH
capacitor will have to be determined empirically. Another
way to implement a hardware squelch is to make R1
equal to 10M ? to 6.8M ? , and use a low-pass filter after
the DO pin and a comparator circuit. The low-pass filter
can be a capacitor, which is C6 in the Test Circuit. The
reference voltage in the comparator can be set close to
VDD/2 and the other input connected to the DO pin.
Power Supply Filter
A decoupling capacitor right at the VDD pin is strongly
recommended as it is in the test circuit, which has 0.1 μ F.
Not shown in the Test Circuit Schematic is an EMI
Inductor, L1 in the silkscreen layer. It has the purpose to
further filter an income noise on the VDD line, generally
present in switching power supplies. It is good practice
Preamble
Dead Time
Data 50%
Manchester
to separate RF ground from digital ground and also VDD
RF from other VDD lines
Figure 9. Data Pattern
Then, the demodulator bandwidth required is calculated
by:
Demod BW =
0.65
shortest pulse
[ Hz ]
August 2008
12
M9999-080108
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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 |
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| 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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