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| 型号： | MICRF009BM |
| 厂商： | Micrel Inc |
| 文件页数： | 8/16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 |
Micrel
MICRF009
315MHz
9.81MHz
control voltage ripple low, preferably under 10mV PP once
390MHz 12.140MHz
418MHz 13.01MHz
433.92MHz 13.51MHz
Table 2. Sweep-Mode Recommended Reference Oscillator
Values For Typical Transmit Frequencies
Step 3: 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, shown in the block
diagram.
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 on
system issues including system decode response time and
data code structure (that is, existence of data preamble,
the control voltage has attained its quiescent value. For
this reason, capacitor values of at least 0.47μF are
recommended.
The AGC control voltage is carefully managed on-chip to
allow duty-cycle operation of the MICRF009. 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 droop due to
capacitor leakage must be replenished. A relatively low-
leakage capacitor is recommended when the devices are
used in duty-cycled operation.
To further enhance duty-cycled operation, the AGC push
and pull currents are boosted for approximately 10ms
immediately after the device is taken out of shutdown. This
compensates for AGC capacitor voltage droop and
reduces the time to restore the correct AGC voltage. The
current is boosted by a factor of 45.
Selecting CAGC Capacitor in Continuous Mode
A CAGC capacitor in the range of 0.47μF to 4.7μF is
typically recommended. Caution! If the capacitor is too
large, the AGC may react too slowly to incoming signals.
AGC settling time, from a completely discharged (zero-volt)
state is given approximately by Equation 6:
etc.) This issue is also covered in more detail in
“Application Note 22.”
The effective resistance of RSC is listed in the electrical
characteristics table as 145k ? at 315MHz, this value
? t = 1.333 × C AGC ? 0.44
where:
C AGC is in μF, and ? t is in seconds.
(6)
(4)
R SC = 145 ?
scales linearly with frequency. Source impedance of the
CTH pin at other frequencies is given by equation (4),
where f T is in MHz:
9.7940
f T
τ of 5x the bit-rate is recommended. The effective
resistance of RSC is listed in the electrical characteristics
table as 145k ? at 315MHz, this value scales inversely with
frequency. Source impedance of the CTH pin at other
frequencies is given by equation (5), where f T is in MHz:
Selecting CAGC Capacitor in Duty-Cycle Mode
Voltage droop across the CAGC capacitor during shutdown
should be replenished as quickly as possible after the IC is
enabled. As mentioned above, the MICRF009 boosts the
push-pull current by a factor of 45 immediately after start-
up. This fixed time period is based on the reference
oscillator frequency f T . The time is 10.9ms for f T =
6.00MHz, and varies inversely with f T . The value of CAGC
capacitor and the duration of the shutdown time period
should be selected such that the droop can be replenished
C TH =
τ
R SC
(5)
within this 10ms period.
Polarity of the droop is unknown, meaning the AGC voltage
(7)
=
A standard ±20% X7R ceramic capacitor is generally
sufficient. Refer to “Application Hint 42” for C TH and C AGC
selection examples.
Step 4: 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
maximize system range, it is important to keep the AGC
could droop up or down. The worst-case from a recovery
standpoint is downward droop, since the AGC pull-up
current is 1/10th magnitude of the pull-down current. The
downward droop is replenished according to the Equation
7:
I ? V
C AGC ? t
where:
I = AGC pull-up current for the initial 10ms (67.5μA)
January 18, 2005
8
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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