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参数资料
| 型号： | MICRF219AAYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER QWIKRADIO 16QSOP |
| 标准包装： | 98 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -112.5dBm |
| 调制或协议： | ASK，OOK |
| 应用： | 通用 |
| 电流 - 接收： | 4.3mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 特点： | 配有 RSSI |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
| 其它名称： | 576-3899-5 |
Micrel, Inc.
Application Information
Initial Startup
When supply voltage is initially applied, it should rise
monotonically from 0V to 3.3V to ensure proper startup
of the crystal oscillator and the PLL. It should not have
multiple bounces across 2.6V, which is the threshold of
the undervoltage lockout (UVLO) circuit inside
MICRF219A. The SHDN pin needs to have 50k ?
resistor to GND and a coupling capacitor to VDD as
shown in the evaluation board schematic to ensure that
the part starts up in shutdown mode first. Then the micro
controller can bring the SHDN pin voltage down to turn
the part on.
Length of Preamble
When using MICRF219A in auto-polling mode, the
preamble of the corresponding transmitter should be
long enough to guarantee that the MICRF219A becomes
fully awake during the preamble portion of the burst.
This way the entire data portion will be received. A good
rule of thumb to use is:
Preamble length = 1.2 x sleep time + length of
valid bits sequence
The factor of 1.2 is to accommodate sleep time variation
due to process shift.
Figure 13 shows an example of insufficient length
preamble. MICRF219A starts checking bits during the
data portion of the burst, so by the time it becomes fully
awake and releases DO, part of the data portion is lost.
In Figure 14, the preamble length is sufficient. The chip
wakes up during the preamble and is ready for the data
portion.
MICRF219A
Figure 14. Sufficient Preamble Length
Antenna and RF Port Connections
The evaluation board offers two options of injecting the
RF input signal: through a PCB antenna or through a
50 Ω SMA connector. The SMA connection allows for
conductive testing, or an external antenna.
Low-Noise Amplifier Input Matching
Capacitor C3 and inductor L2 form the “L” shape input
matching network to the SMA connector. The capacitor
cancels out the inductive portion of the net impedance
after the shunt inductor, and provides additional
attenuation for low-frequency outside band noise. The
inductor is chosen to over resonate the net capacitance
at the pin, leaving a net-positive reactance and
increasing the real part of the impedance. It also
provides additional ESD protection for the antenna pin.
The input impedance of the device is listed in Table 6 to
aid calculation of matching values. Note that the net
impedance at the pin is easily affected by component
pads parasitic due to the high input impedance of the
device. The numbers in Table 6 does NOT include trace
and component pad parasitic capacitance, which total
about 0.75pF on the evaluation board.
The matching components to the PCB antenna (L3 and
C9) were empirically derived for best over-the-air
reception range.
Frequency (MHz)
315
390
418
433.92
Z Device ( ? )
23 ? j290
14 – j230
17 – j216
12 – j209
Figure 13. Preamble Length Too Short
Table 6. Input Impedance for the Most Used frequencies
July 2011
17
M9999-071811-A
RadioTech@micrel.com or (408) 944-0800
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MICRF219AAYQS TR | 功能描述:射频接收器 300MHz to 450MHz, 3.0V to 3.6V, 6mA, <10kbps, ASK Receiver with Auto-Poll, RSSI and Squelch (Recommended for New Designs) 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 |
| MICRF219AAYQS-TR | 功能描述:- RF Receiver ASK, OOK 300MHz ~ 450MHz -112.5dBm PCB, Surface Mount 16-QSOP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 频率:300MHz ~ 450MHz 灵敏度:-112.5dBm 数据速率（最大值）:- 调制或协议:ASK，OOK 应用:通用 电流 - 接收:4.3mA 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:配有 RSSI 电压 - 电源:3 V ~ 3.6 V 工作温度:-40°C ~ 105°C 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商器件封装:16-QSOP 标准包装:1 |
| MICRF219AYQS | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF219AYQS TR | 功能描述:射频接收器 QwikRadio Receiver (Not Recommended for New Designs) 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 |
| MICRF220 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300MHz to 450MHz, 3.3V ASK/OOK Receiver with RSSI and Squelch |
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