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参数资料
| 型号： | MICRF011BN |
| 厂商： | Micrel Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC RCVR/DATA DEMOD RF/IF 14DIP |
| 标准包装： | 25 |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -103dBm |
| 数据传输率 - 最大： | 10 kbps |
| 调制或协议： | OOK |
| 应用： | 车库门开启器 |
| 电流 - 接收： | 2.4mA |
| 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： | 14-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-DIP |
| 包装： | 管件 |
MICRF011
QwikRadio
tm
Micrel
[By adding resistance from the CAGC pin to VDDBB or
VSSBB in parallel with the CAGC capacitor, the ratio of
decay-to-attack time-constant may be varied, although the
value of such adjustments must be studied on a per-
application basis. Generally the design value of 10:1 is
adequate for the vast majority of applications.] See
Here ft is in MHz. Connect a crystal of frequency ft to the
REFOSC pin of the MICRF011. 4 decimal-place accuracy
on the frequency is generally adequate. The following table
identifies ft for some common Transmit frequencies when
the MICRF011 is operated in FIXED mode.
“Application Note 22” .
To maximize system range, it is important to keep the AGC
control voltage ripple low, preferably under 10mVpp once
the control voltage has attained its quiescent value. For this
reason capacitor values ≥ 0.47uF are recommended.
Transmit Freq. ftx (MHz)
315
418
433.92
REFOSC Freq. ft (MHz)
4.8970
6.4983
6.7458
Reference Oscillator (REFOSC) and External Timing
2.
Selecting REFOSC Frequency ft (SWP Mode)
Element
All timing and tuning operations on the MICRF011 are
derived from the REFOSC function. This function is a
single-pin Colpitts-type oscillator. The user may handle this
pin in one of three possible ways:
Selection of REFOSC frequency ft in SWP mode is much
simpler than in FIXED mode, due to the LO sweeping
process. Further, accuracy requirements of the frequency
reference component are significantly relaxed.
In SWP mode, ft is given by equation (3):
(1) connect a ceramic resonator, or
(2) connect a crystal, or
ft = ftx / 64.25.
(3)
(3) drive this pin with an external timing signal.
The third approach is attractive for further lowering system
cost if an accurate reference signal exists elsewhere in the
system (e.g., a reference clock from a crystal or ceramic
resonator-based microprocessor). An externally applied
signal should be AC-coupled, and resistively-divided down
(or otherwise limited) to approximately 0.5Vpp. The specific
reference frequency required is related to the system
transmit frequency, and the operating mode of the device as
Connect a ceramic resonator of frequency ft to the REFOSC
pin of the MICRF011. 2-decimal place accuracy is generally
adequate. (A crystal may also be used if desired, but may
be necessary to reduce the Rx frequency ambiguity if the Tx
frequency ambiguity is excessive. See Application Note 22
for further details.)
3. Selecting Capacitor CTH
First step in the process is selection of a Data Slicing Level
set by the SWEN control pin. See “Application Note 22,
timeconstant.
This selection is strongly dependent on
MICRF001 Theory of Operation” for a discussion of
frequency selection and accuracy requirements.
MICRF011 Frequency and Capacitor Selection
Selection of the REFOSC frequency ft, Slicing Level (CTH)
capacitor, and AGC capacitor are briefly summarized in this
section. Please see Application Note 22 for complete
system issues, like system decode response time and data
code structure (e.g., existence of data preamble, etc.). This
issue is too broad to discuss here, and the interested reader
should consult the Application Note 22.
Source impedance of the CTH pin is given by equation (4),
where ft is in MHz:
details.
Rsc = 118k ? * (4.90 / ft).
(4)
1. Selecting REFOSC Frequency ft (FIXED Mode)
As with any superheterodyne receiver, the difference
between the (internal) Local Oscillator (LO) frequency flo
Assuming that a Slicing Level Timeconstant TC has been
established, capacitor CTH may be computed using
equation (5):
and the incoming Transmit frequency ftx must ideally equal
the IF Center frequency. Equation (1) may be used to
compute the appropriate flo for a given ftx:
flo = ftx ± 1.064 * (ftx / 390)
(1)
where ftx and flo are in MHz. Note that two values of flo
exist for any given ftx, distinguished as “high-side mixing”
and “low-side mixing”, and there is generally no preference
of one over the other.
After choosing one of the two acceptable values of flo, use
equation (2) to compute the REFOSC frequency ft:
ft = flo / 64.5.
(2)
CTH = TC / Rsc.
(5)
December 1998b
88
MICRF011
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