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| 型号： | MICRF010BM |
| 厂商： | Micrel Inc |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC RCVR UHF 300-440MHZ 8-SOIC |
| 标准包装： | 95 |
| 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： | 管件 |
Micrel
The Demodulator Filter Bandwidth
There is no external control to set the demodulator
MICRF010
protection diodes at all input and output pins are not
shown.
bandwidth. The maximum bandwidth is 2000 hertz at 315
MHz. Maximum bandwidth scales linearly with operating
frequency. To minimize data pulse stretching, one must
CTH Pin
VDD
calculate the “demodulator BW required” to be certain that
it does not exceed demodulator filter bandwidth of
Demodulator
Signal
PHI2B
PHI1B
MICRF010 at operating frequency. For “demodulator BW
required” calculation, one needs to identify the shortest
TG2
TG1
CTH
~1.6V
pulse within the data profile and use equation 8 below:
VSS
PHI2
VSS
PHI1
Demodulato r BW Required =
0 . 65
shortest pulse - width
(8)
Figure 2. CTH Pin
Refer to the “Electrical Characteristics” for the exact filter
bandwidth at a chosen frequency.
Power Supply Bypass Capacitors
Supply bypass capacitors are strongly recommended. One
example is to use 0.1uF ceramic capacitor in parallel with
100pF ceramic capacitor for VDD.
Data Squelching
Figure 2 illustrates the CTH pin interface circuit. The CTH
pin is driven from a N-Channel MOSFET source-follower
with approximately 10μA of bias. Internal control signals
PHI1/PHI2 are related in a manner such that the
impedance across the transmission gates looks like a
“resistance” of approximately 150k ? . The DC potential at
the CTH pin is approximately 1.6V
CAGC Pin
VDD
During quiet periods (no signal), the data output (DO pin)
transitions randomly with noise. Most decoders can
7 u A
16 u A
discriminate between this random noise and actual data.
For some systems, random transition due to noise during
quiet period is a problem. There are three possible
approaches to reduce this output noise:
1. Analog squelch to raise the demodulator threshold.
Compa-
rator
Timeout
CAGC
2. Digital squelch to disable the output when data is not
present.
85 u A
160 u A
3. Output filter to filter the (high frequency) noise
glitches on the data output pin.
The simplest solution is to perform analog squelch by
inducing a small offset, or squelch voltage, on the CTH pin
so that noise does not trigger the internal comparator,
Usually 20mV to 30mV on CTH pin is sufficient. This may
be achieved by connecting a several-meg-ohm resistor
from the CTH pin to either VSSBB or VDDBB, depending
upon the desired offset polarity. Since MICRF010’s
receiver AGC noise at the internal comparator input is
always the same (set by the AGC), the squelch-offset
requirement does not change as the local noise strength
changes from installation to installation. Introducing
squelch will reduce sensitivity and range. One should
introduce minimal offset to sufficiently quiet the output.
Typical squelch resistor values range from 10M ? to 6.8M ?
for low to high squelch strength.
I/O Pin Interface Circuitry
Interface circuitry for the various I/O pins of the MICRF010
are diagrammed in Figures 2 through 8. The ESD
VSS
Figure 3. CAGC Pin
Figure 3 illustrates the CAGC pin interface circuit. The
AGC control voltage is developed as an integrated current
into a capacitor CAGC. The attack current is nominally
1.5μA, while the decay current is a 10 times scaling of this,
approximately 15μA. Signal gain of the RF/IF strip inside
the IC diminishes as the voltage on CAGC decreases. By
simply adding a capacitor to CAGC pin, the attack/decay
time constant ratio is fixed at 10:1. Modification of the
attack/decay ratio is possible by adding resistance from the
CAGC pin to either VDDBB or VSSBB, as desired.
Both the push and pull current sources are disabled during
shutdown, which maintains the voltage across CAGC, and
improves recovery time in duty-cycled applications. To
further improve duty-cycle recovery, both push and pull
currents are increased by 45 times for approximately 10ms
after release of the SHUT pin. This allows rapid recovery of
any voltage droop on CAGC while in shutdown.
June 2005
9
M9999-063005
(408) 955-1690
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| MICRF010BMTR | 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 |
| MICRF010YM | 功能描述:射频接收器 Low Power 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 |
| MICRF010YM TR | 功能描述:射频接收器 Low Power 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 |
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