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参数资料
| 型号： | MICRF009BM |
| 厂商： | Micrel Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER UHF LOW POWER 16SOIC |
| 标准包装： | 48 |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -102dBm |
| 数据传输率 - 最大： | 2 kbps |
| 调制或协议： | ASK，OOK |
| 应用： | RKE |
| 电流 - 接收： | 2.9mA |
| 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
(8)
Demodulator Bandwidth =
Micrel
Step 5: Selecting The Demodulator Filter
Bandwidth
The input SEL0 controls the demodulator filter bandwidth in
two binary steps, (625Hz to 1250Hz in sweep, 1250Hz to
2500Hz in fixed mode), see Table 3. Bandwidth must be
selected according to the application. The demodulator
bandwidth should be set according to equation 8. SEL1
tied to VSS by default.
0.65
shortest pulse - width
It should be noted that the values indicated in Table 1 are
the nominal values. The filter bandwidth scales linearly with
frequency so the exact value will depend on the operating
frequency. Refer to the “Electrical Characteristics” for the
exact filter bandwidth at a chosen frequency.
MICRF009
pin so that noise does not trigger the internal comparator.
Usually 20mV to 30mV is sufficient, and may be achieved
by connecting a several-meg-ohm resistor from the CTH
pin to either VSSBB or VDDBB, depending on the desired
offset polarity. Since MICRF009’s receiver AGC noise at
the internal comparator input is always the same (set by
the AGC), the squelch-offset requirement does not change
as the local noise strength changes from installation to
installation. Introducing squelch will reduce sensitivity and
also reduce range. Only introduce an amount of offset
sufficient to quiet the output. Typical squelch resistor
values range from 10M ? to 6.8M ? for low to high squelch
strength.
I/O Pin Interface Circuitry
Interface circuitry for the various I/O pins of the MICRF009
are diagrammed in Figures 2 through 8. The ESD
SEL0
Demodulator Bandwidth
Sweep Mode Fixed Mode
protection diodes at all input and output pins are not
shown.
1
0
1250Hz
625Hz
2500Hz
1250Hz
CTH Pin
Table 3. Nominal Demodulator Filter Bandwidth
vs. SEL0 and Operating Mode at 433.92MHz
Power Supply Bypass Capacitors
Supply bypass capacitors are strongly recommended.
They should be connected to VDDBB and VDDRF and
should have the shortest possible lead lengths. For best
performance, connect VSSRF to VSSBB, VDDBB to
VDDRF at the power supply only (that is, keep base-band
currents from flowing through the RF return path).
Increasing Selectivity with Optional Bandpass Filter
For applications located in high ambient noise
environments, a fixed value band-pass network may be
connected between the ANT pin and VSSRF to provide
additional receiver selectivity and input overload protection.
A minimum input configuration is included in Figure 9. It
provides some filtering and necessary overload protection.
Data Squelching
During quiet periods (no signal), the data output (DO pin)
transitions randomly with noise. Most decoders can
discriminate between this random noise and actual data.
For some systems, it does present a problem. There are
three possible approaches to reduce this output noise:
1. Analog squelch to raise the demodulator threshold.
2. Digital squelch to disable the output when data is not
present.
3. Output filter to filter the (high frequency) noise
glitches on the data output pin.
The simplest solution is to add analog squelch by
introducing a small offset, or squelch voltage, on the CTH
Figure 2. CTH Pin
Figure 2 illustrates the CTH pin interface circuit. The CTH
pin is driven from a P-Channel MOSFET source-follower
with approximately 10μA of bias. Transmission gates TG1
and TG2 isolate the 6.9pF capacitor. Internal control
signals PHI1/PHI2 are related in a manner such that the
impedance across the transmission gates looks like a
“resistance” of approximately 145k ? . The DC potential at
the CTH pin is approximately 1.6V
CAGC Pin
Figure 3. CAGC Pin
January 18, 2005
10
M9999-011805
(408) 955-1690
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相关代理商/技术参数 |
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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 |
| MICRF010 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:QwikRadio Low-Power UHF Receiver |
| MICRF010BM | 功能描述:IC RCVR UHF 300-440MHZ 8-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 |
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