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| 型号： | MICRF002YM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/17页 |
| 文件大小： | 0K |
| 描述： | IC ASK RCVR RF/IF SHUTDWN 16SOIC |
| 标准包装： | 48 |
| 系列： | QwikRadio® |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -95dBm |
| 数据传输率 - 最大： | 10 kbps |
| 调制或协议： | ASK，OOK |
| 应用： | RKE |
| 电流 - 接收： | 2.2mA |
| 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 |
| 产品目录页面： | 571 (CN2011-ZH PDF) |
| 其它名称： | 576-1332 |
f LO = f TX ± ? ? 0.86 TX ? ?
? f ?
f T =
f LO
Micrel, Inc.
MICRF002, 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 430kHz 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 5.0kbps.
Similar performance is not currently available with
crystalbased superheterodyne receivers which can operate
only with SAW- or crystal-based transmitters. In sweep-
mode, a range reduction will occur in installations where
there is a strong interferer in the swept RF band. This is
MICRF002/RF022
the appropriate f LO for a given f TX :
(1)
? 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.
After choosing one of the two acceptable values of f LO , use
Equation 2 to compute the reference oscillator frequency f T :
(2)
64.5
Frequency f T is in MHz. Connect a crystal of frequency f T to
REFOSC on the MICRF002. Four-decimal-place accuracy
on the frequency is generally adequate. The following table
identifies f T for some common transmit frequencies when
the MICRF002 is operated in fixed mode.
because the process indiscriminately includes all signals
within the sweep range. An MICRF002 may be used in
place of a superregenerative receiver in most applications.
Step 2: Selecting the Reference Oscillator
All timing and tuning operations on the MICRF002 are
derived from the internal Colpitts reference oscillator.
Timing and tuning is controlled through the REFOSC pin in
one of three ways:
Transmit Frequency f TX
315MHz
390MHz
418MHz
433.92MHz
Reference Oscillator
Frequency f T
4.8970MHz
6.0630MHz
6.4983MHz
6.7458MHz
f T =
f LO
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 capacitors are selected. Application Hint
34 and Application Hint 35 provide additional information
and recommended sources for crystals and resonators.
If operating in fixed-mode, a crystal is recommended. In
sweep-mode either a crystal or ceramic resonator may be
used. When a crystal of ceramic resonator is used the
Table 2. 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:
(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.
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 .
Transmit Frequency f TX
315MHz
Reference Oscillator
Frequency f T
4.88MHz
Selecting Reference Oscillator Frequency f T (Fixed-
Mode)
As with any superheterodyne receiver, the mixing
between the internal LO (local oscillator) frequency f LO and
the incoming transmit frequency f TX ideally must equal the
IF center frequency. Equation 1 may be used to compute
390MHz 6.05MHz
418MHz 6.48MHz
433.92MHz 6.73MHz
Table 3. Sweep-Mode Recommended Reference Oscillator
Values for Typical Transmit Frequencies
July 2008
8
M9999-070808
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