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| 型号： | MICRF009BM |
| 厂商： | Micrel Inc |
| 文件页数： | 7/16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 |
f LO = f TX ± ? 0.86 TX ?
(1)
Micrel
MICRF009, allowing the device to operate in applications
where significant transmitter-receiver frequency
misalignment may exist. The transmit frequency may vary
up to ±0.5% over initial tolerance, aging, and temperature.
In sweep-mode, a band approximately 1.5% around the
nominal transmit frequency is captured. The transmitter
may drift up to ±0.5% without the need to retune the
receiver and without impacting system performance.
The swept-LO technique does not affect the IF bandwidth,
therefore noise performance is not degraded relative to
fixed-mode. The IF bandwidth is 680kHz whether the
device is operating in fixed or sweep-mode.
Due to limitations imposed by the LO sweeping process,
the upper limit on data rate in sweep-mode is
approximately 1250Hz.
Similar performance is not currently available with crystal-
based superheterodyne receivers, which can operate only
MICRF009
between the internal LO (local oscillator) frequency f LO and
the incoming transmit frequency f TX , should equal the IF
center frequency. Equation 1 may be used to compute the
appropriate f LO for a given f TX :
? f ?
? 315 ?
Frequencies f TX and f LO are in MHz. Note that two values
of f LO exist for any given f TX , distinguished as “high-side
mixing” and “low-side mixing.” High-side mixing results in
an image frequency above the frequency of interest and
low-side mixing results in a frequency below. There is
generally no preference of one over the other.
After choosing one of the two acceptable values of f LO , use
Equation 2 to compute the reference oscillator frequency
f T :
with SAW- or crystal-based transmitters.
In sweep-mode, a range reduction will occur in installation
f T = 2 ×
f LO
64.5
(2)
where there is a strong interferer in the swept RF band.
This is because the process indiscriminately includes all
signals within the sweep range. An MICRF009 may be
used in place of a super-regenerative receiver in most
applications.
Step 2: Selecting The Reference Oscillator
Frequency f T is in MHz. Connect a crystal of frequency f T
to REFOSC on the MICRF009. Four-decimal-place
accuracy on the frequency is generally adequate. The
following table identifies f T for some common transmit
frequencies when the MICRF009 is operated in fixed-
mode.
All timing and tuning operations on the MICRF009 are
derived from the internal Colpitts reference oscillator.
Transmit Frequency (f TX )
Reference Oscillator
Frequency (f T )
f TX
Timing and tuning is controlled through the REFOSC pin in
one of three ways:
1. Connect a ceramic resonator.
2. Connect a crystal.
3. Drive this pin with an external timing signal.
The specific reference frequency required is related to the
system transmit frequency and to the operating mode of
the receiver as set by the SWEN pin.
Crystal or Ceramic Resonator Selection
Do not use resonators with integral capacitors since
capacitors are included in the IC, also care should be taken
to ensure low ESR crystals are selected. Contact Micrel RF
Applications for suggested suppliers and part numbers.
If operating in fixed-mode, a crystal is recommended. In
sweep-mode either a crystal or ceramic resonator may be
used. When a crystal or ceramic resonator is used, the
minimum voltage is 300mV PP . If using an externally
applied signal, it should be AC-coupled and limited to the
operating range of 0.1V PP to 1.5V PP .
Selecting Reference Oscillator Frequency f T
315MHz 9.7941MHz
390MHz 12.1260MHz
418MHz 12.9966MHz
433.92MHz 13.4916MHz
Table 1. Fixed-Mode Recommended Reference Oscillator
Values For Typical Transmit Frequencies (high-side mixing)
Selecting REFOSC Frequency f T
(Sweep Mode)
Selection of the reference oscillator frequency f T in sweep
mode is much simpler than in fixed mode due to the LO
sweeping process. Also, accuracy requirements of the
frequency reference component are significantly relaxed.
In sweep mode, f T is given by Equation 3:
f T = 2 × (3)
64.25
In sweep mode a reference oscillator with frequency
accurate to two-decimal-places is generally adequate. A
crystal may be used and may be necessary in some cases
if the transmit frequency is particularly imprecise.
Reference Oscillator
(Fixed-Mode)
As with any superheterodynes receiver, the difference
January 18, 2005
7
Transmit Frequency (f TX )
Frequency (f T )
M9999-011805
(408) 955-1690
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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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