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| 型号： | MICRF213AYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 10/16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.
the top layer close to the REFOSC pins RO1 and
RO2. When care is not taken in the layout, and
crystals from other vendors are used, the oscillator
may take longer times to start as well as the time to
good data in the DO pin to show up. In some cases, if
the stray capacitance is too high (>20pF), the
oscillator may not start at all.
The crystal frequency is calculated by REFOSC = RF
Carrier/(32+(1.1/12)). The local oscillator is low side
injection (32 × 9.81563MHz = 314.1MHz), that is, its
MICRF213
according to Table 6. For example, if the pulse period
is 140μsec, 50% duty cycle, then the pulse width will
be 70μsec (PW = (140 μsec * 50%) / 100). So, a
bandwidth of 9.286kHz would be necessary (0.65 /
70μsec). However, if this data stream had a pulse
period with a 20% duty cycle, then the bandwidth
required would be 23.2kHz (0.65 / 28μsec), which
exceeds the maximum bandwidth of the demodulator
circuit. If one tries to exceed the maximum bandwidth,
the pulse would appear stretched or wider.
frequency is below the RF carrier frequency and the
image frequency is below the LO frequency. Refer to
Figure 6. The product of the incoming RF signal and
local oscillator signal will yield the IF frequency, which
will then be demodulated by the detector of the
device.
SEL0
JP1
Short
Open
Short
SEL1
JP2
Short
Short
Open
Demod.
BW
(hertz)
1180
2360
4720
Shortest
Pulse
(usec)
551
275
138
Maximum
baud rate for
50% Duty
Cycle (hertz)
908
1815
3631
Image
Frequency
Desired
Signal
Open
Open
9400
69
7230
Table 6. JP1 and JP2 Setting, 315MHz
Capacitors C6 and C4, Cth and Cagc capacitors
respectively, provide the time base reference for the
data pattern received. These capacitors are selected
f LO
f (MHz)
according to data profile, pulse duty cycle, dead time
between two received data packets and if the data
pattern has or not a preamble. See Figure 7 for an
Figure 6. Low Side Injection Local Oscillator
example of a data profile.
Other frequencies will have different demodulator
REFOSC
(MHz)
9.467411
9.81563
Carrier
(MHz)
303.825
315
HIB Part Number
SA-9.467411-F-10-H-30-30-X
SA-9.815630-F-10-H-30-30-X
bandwidth limits, which are derived from the reference
oscillator frequency. Table 7 and Table 8, below,
show the limits for the other two most used
frequencies.
10.75045
345.0
SA-10.750450-F-10-H-30-30-X
SEL0
SEL1
Demod.
Shortest
Maximum
Table 5. Crystal Frequency and Vendor Part Number
JP1 and JP2 are the bandwidth selection for the
demodulator bandwidth. To set it correctly, it is
necessary to know the shortest pulse width of the
encoded data sent in the transmitter. Reference the
example of the data profile, in the Figure 7, below:
JP1
Short
Open
Short
Open
JP2
Short
Short
Open
Open
BW
(hertz)
1140
2280
4550
9100
Pulse
(usec)
570
285
143
71
baud rate for
50% Duty
Cycle (hertz)
8770
1754
3500
7000
Table 7. JP1 and JP2 Setting, 303.825MHz
SEL0
JP1
SEL1
JP2
Demod.
BW
(hertz)
Shortest
Pulse
(usec)
Maximum
baud rate for
50% Duty
Cycle (Hertz)
Figure 7. Example of a Data Profile
PW2 is shorter than PW1, so PW2 should be used for
the demodulator bandwidth calculation. The
calculation is found by 0.65/shortest pulse width. After
Short
Open
Short
Open
Short
Short
Open
Open
1290
2580
5170
10340
504
252
126
63
992
1985
3977
7954
this value is found, the setting should be done
Table 8. JP1 and JP2 Setting, 345.0MHz
May 2007
10
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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