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参数资料
| 型号： | MICRF001BN |
| 厂商： | Micrel Inc |
| 文件页数： | 6/8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： | -95dBm |
| 数据传输率 - 最大： | 4.8 kbps |
| 调制或协议： | OOK |
| 应用： | 车库门，RKE |
| 电流 - 接收： | 6.3mA |
| 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 |
MICRF001
QwikRadio tm
Micrel
External Control Signals and Mode Selection
For applications where the transmit frequency is accurately
set for other reasons (e.g., applications where a SAW
transmitter is used for its mechanical stability), the user may
choose to configure the MICRF001 as a standard
superheterodyne receiver (FIXED mode), mitigating the
aforementioned problem of a competing close-in signal. This
can be accomplished by tying SWEN to ground. Doing so
forces the on-chip LO frequency to a fixed value. In such a
case, the ceramic resonator would be replaced with a crystal.
Generally, however, the MICRF001 can be operated with a
ceramic resonator adequately, no matter whether the
transmitter is LC or SAW based.
Slicing Level and the CTH Capacitor
Extraction of the DC value of the demodulated signal for
purposes of logic-level data slicing is accomplished by
external capacitor CTH and the on-chip switched-cap
“resistor” RSC, indicated in the block diagram. The effective
resistance of RSC varies in the same way as the
Demodulator filter bandwidth, in four binary steps, from
approximately 1600k ? to 200k ? . Once the filter bandwidth
is selected, this “resistance” is determined; then the value of
capacitor CTH is easily calculated, once the slicing level
time-constant is chosen. Values vary somewhat with
decoder type, but typical Slicing Level time constants range
5-50msec. Optimization of the CTH value is required to
maximize range, as discussed in “Application Note 22,
MICRF001 Theory of Operation”, section 6.4.
AGC Function and the CAGC Capacitor
The signal path has automatic gain control (AGC) to increase
input dynamic range. An external capacitor, CAGC, must be
applied to set the AGC attack and decay time-constants.
With the addition of only a capacitor, the ratio of decay-to-
attack time-constant is fixed at 10:1 (i.e., the attack time
constant is 1/10th the decay time constant), and this ratio
cannot be changed by the user. However, the attack time
constant is selectable by the user through the value of
capacitor CAGC. 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. See
“Application Note 22, MICRF001 Theory of Operation”.
Reference Oscillator (REFOSC) and External Timing
Element
All timing and tuning operations on the MICRF001 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:
(1) connect a ceramic resonator, or
(2) connect a crystal, or
(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), and flexibility exists in the
choice of system transmit frequency. 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
set by the SWEN control pin. See “Application Note 22,
MICRF001 Theory of Operation” for a discussion of
frequency selection and accuracy requirements.
I/O Pin Interface Circuitry
Interface circuitry for the various I/O pins of the MICRF001 is
shown in Figures 1 through 6. Specific information regarding
each of these circuits is discussed in the following sub-
paragraphs. Not shown are ESD protection diodes which
are applied to all input pins.
1. ANT Pin
The ANT pin is internally AC-coupled via a 3pF capacitor, to
an RF N-channel MOSFET, as shown in Figure 1.
Impedance on this pin to VSS is quite high at low
frequencies, and decreases as frequency increases. In the
UHF frequency range, the device input can be modeled as
6.3k ? in parallel with 2pF (pin capacitance) shunt to VSSRF.
Figure 1 ANT Pin
2. CTH Pin
Figure 2 illustrates the CTH pin interface circuit. CTH pin is
driven from a P-channel MOSFET source-follower biased
with approximately 20μA of bias current. Transmission gates
TG1 and TG2 isolate the 3.3pF capacitor. Internal control
signals PHI1/PHI2 are related in a manner such that the
impedance across the transmission gates looks like a
“resistance”. The DC potential on the CTH pin is
approximately 2.2V, fundamentally determined by the Vgs of
the two P-channel MOSFET source-followers shown.
June 1998
6
MICRF001
相关PDF资料 |
PDF描述 |
|---|---|
| MICRF001BM TR | IC RCVR/DATA DEMOD RF/IF 14SOIC |
| AMB345906 | SENSOR REFL LONG V TYPE W/OSC |
| AMB345905 | SENSOR REFL LONG V TYPE W/OSC |
| AMB340912 | SENSOR REFL LONG H TYPE W/OSC |
| AMB340910 | SENSOR REFL LONG H TYPE W/OSC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF001YM | 功能描述:射频接收器 300-440MHz RF 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 |
| MICRF001YM TR | 功能描述:射频接收器 300-440MHz RF 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 |
| MICRF001YM-TR | 功能描述:- RF Receiver OOK 300MHz ~ 440MHz -95dBm 4.8 kbps PCB, Surface Mount 14-SOIC 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 频率:300MHz ~ 440MHz 灵敏度:-95dBm 数据速率（最大值）:4.8 kbps 调制或协议:OOK 应用:车库门，RKE 电流 - 接收:6.3mA 数据接口:PCB，表面贴装 存储容量:- 天线连接器:PCB，表面贴装 特性:自动调谐 电压 - 电源:4.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商器件封装:14-SOIC 标准包装:1 |
| MICRF001YN | 功能描述:射频接收器 300-440MHz RF 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 |
| MICRF002 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300-440MHz QwikRadio? ASK Receiver |
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