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| 型号： | MICRF010BMTR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/14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) |
Micrel
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 drop 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:
MICRF010
(that is, the attack time constant is 10 times of the decay
time constant). Generally the design value of 1:10 is
adequate for the vast majority of applications. If adjustment
is required, adding a resistor in parallel of the C AGC
capacitor may vary the ratio. The value of the resistor must
be determined on a case-by-case basis.
? t = 1.333 × C AGC ? 0.44
(6)
where:
C AGC is in μF, and ? t is in seconds.
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 MICRF010 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 =
12.00MHz, 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
within this 10ms period.
Polarity of the droop is unknown, meaning the AGC voltage
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
C AGC
=
? V
? t
(7)
where:
I = AGC pull-up current for the initial 10ms (67.5μA)
C AGC = AGC capacitor value
? t = drop recovery time
? V = drop voltage
For example, if user desires ? t = 10ms and chooses a
4.7μF CAGC, the allowable droop is about 144mV. Using
the same equation with 200nA, the worst-case pin leakage,
and assuming 1μA of capacitor leakage in the same
direction, the maximum allowable ? t (shutdown time) is
about 0.56s for droop recovery in 10ms.
The ratio of decay-to-attack time-constant is fixed at 1:10
June 2005
8
M9999-063005
(408) 955-1690
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| 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 |
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| MICRF011BM | 功能描述:IC RCVR/DATA DEMOD RF/IF 14SOIC 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 |
| MICRF011BM TR | 功能描述:IC RCVR/DATAMOD300-440MHZ 14SOIC 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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