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| 型号： | MICRF010BMTR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/14页 |
| 文件大小： | 0K |
| 描述： | IC RCVR UHF 300-440MHZ 8-SOIC |
| 标准包装： | 2,500 |
| 频率： | 300MHz ~ 440MHz |
| 灵敏度： | -104dBm |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
f LO = f TX ± ? 0.86 TX ?
(1)
R SC = 150 ?
(4)
Micrel
is desired, use crystals with lower ESR, which normally are
bigger in size, like the HC49 package. “Application Hints
35” provides additional information and recommended
sources for crystals. If using an externally applied signal, it
should be AC-coupled and limited to the operating range of
0.2V PP to 1.5V PP .
Selecting Reference Oscillator Frequency f T
As with any super-heterodyne receiver, the difference
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
MICRF010
Slicing level time constant values vary somewhat with
decoder type, data pattern, and data rate, but typically
values range from 5ms to 50ms. This issue is covered in
more detail in “Application Note 22.” Optimization of the
value of C TH is required to maximize range.
Selecting Capacitor C TH
The first step in the process is selection of a data-slicing-
level time constant. This selection is strongly dependent
upon system issues including system decode response
time and data code structure (that is, existence of data
preamble, etc.) This issue is also covered in more detail in
“Application Note 22.”
The effective resistance of R SC is listed in the electrical
characteristics table as 150k ? at 315MHz, this value
scales inversely with frequency. R SC value at other
frequencies is given by equation (4), where f T is in MHz:
9.7941
f T
C TH can be calculated using equation (5) with the
knowledge of R sc and τ.
f LO
C TH =
Equation 2 to compute the reference oscillator frequency
f T :
f T = 2 × (2)
64.5
Frequency f T is in MHz. Connect a crystal of frequency f T
to REFOSC on the MICRF010.
Four-decimal-place
τ
R SC
Recommended τ is 5x the bit-rate.
(5)
accuracy on the frequency is generally adequate. The
following table identifies f T for some common transmit
frequencies.
A standard ±20% X7R ceramic capacitor for C TH is
generally sufficient. Refer to “Application Hint 42” for C TH
and C AGC selection examples.
Transmit Frequency (f TX )
315.0 MHz
390.0 MHz
418.0 MHz
Reference Oscillator
Frequency (f T )
9.7941 MHz
12.1260 MHz
12.9966 MHz
Step 3: Selecting C AGC Capacitor
The signal path has AGC (automatic gain control) to
increase input dynamic range. The attack time constant of
the AGC is set externally by the value of the CAGC
capacitor connected to the CAGC pin of the device. To
433.92 MHz 13.4916 MHz
Table 1. Recommended Reference Oscillator Values For
Typical Transmit Frequencies (high-side mixing)
maximize system range, it is important to keep the AGC
control voltage ripple low, preferably under 10mV PP once
the control voltage attains its quiescent value. For this
reason,
capacitor
values
of at least
0.47μF
are
Step 2: Selecting C TH Capacitor
Extraction of the DC value of the demodulated signal for
purposes of logic-level data slicing is accomplished using
the external threshold capacitor C TH and the on-chip
switched capacitor “resistor” RSC, as shown in the block
diagram.
recommended.
The AGC control voltage is carefully managed on-chip to
allow duty-cycle operation of the MICRF010. When the
device is placed into shutdown mode (SHUT pin is pulled
high), the AGC capacitor floats to retain the voltage. When
operation is resumed, only the voltage drop, due to
capacitor leakage, must be replenished. A relatively low-
leakage capacitor such as a ceramic type is recommended
June 2005
7
M9999-063005
(408) 955-1690
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