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| 型号： | MICRF219AAYQS |
| 厂商： | Micrel Inc |
| 文件页数： | 10/23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 |
BW Operating Freq = BW @433.92MHz × ?
?
Micrel, Inc.
Detector and Programmable Low-Pass Filter
The demodulation starts with the detector removing the
carrier from the IF signal. Post detection, the signal
becomes baseband information. The low-pass filter
further enhances the baseband signal. There are four
selectable low-pass filter BW settings: 1625Hz, 3250Hz,
6500Hz, and 13000Hz for 433.92MHz operation. The
low-pass filter BW is directly proportional to the crystal
reference frequency, and hence RF Operating
Frequency. Filter BW values can be easily calculated by
direct scaling. Equation 5 illustrates filter Demod BW
calculation:
? Operating Freq (MHz) ?
? 433.92 ?
Eq. 5
It is very important to select a suitable low-pass filter BW
setting for the required data rate to minimize bit error
rate. Use the operating curves that show BER vs. bit
rates for different D[4:3] settings as a guide.
This low-pass filter ? 3dB corner, or the demodulation
BW, is set at 13000Hz @ 433.92MHz as default
(assuming both SEL0 and SEL1 pins are connected to
V DD ). The low-pass filter can be set by changing register
bits D[4:3]. Table 2 demonstrates the scaling for
315MHz RF frequency:
MICRF219A
Slicer and CTH
The signal prior to the slicer, labeled “Audio Signal” in
Figure 1, is still baseband analog signal. The data slicer
converts the analog signal into ones and zeros based on
50% of the slicing threshold voltage built up in the CTH
capacitor. After the slicer, the signal is demodulated
OOK digital data. When there is only thermal noise at
ANT pin, the voltage level on CTH pin is about 650mV.
This voltage starts to drop when there is RF signal
present. When the RF signal level is greater than
? 100dBm, the voltage is about 400mV.
The value of the capacitor from CTH pin to GND is not
critical to the sensitivity of MICRF219A, although it
should be large enough to provide a stable slicing level
for the comparator. The value used in the evaluation
board of 0.1 μ F is good for all bit rates from 500bps to
20kbps.
CTH Hold Mode
If the internal demodulated signal (DO’ in Figure 1) is at
logic LOW for more than about 4msec, the chip
automatically enters CTH hold mode, which holds the
voltage on CTH pin constant even without RF input
signal. This is useful in a transmission gap, or
“deadtime”, used in many encoding schemes. When the
signal reappears, CTH voltage does not need to re-
settle, improving the time to output with no pulse width
distortion, or time to good data (TTGD).
AGC Loop and CAGC
D[4]
0
0
1
1
D[3]
0
1
0
1
Low-Pass
Filter BW
1625Hz
3250Hz
6500Hz
13000Hz
Maximum
Encoded Bit Rate
2.5kbps
5kbps
10kbps
20kbps
The AGC comparator monitors the signal amplitude from
the output of the programmable low-pass filter. The AGC
loop in the chip regulates the signal at this point to be at
a constant level when the input RF signal is within the
AGC loop dynamic range (about ? 115dBm to ? 40dBm).
When the chip first turns on, the fast charge feature
charges the CAGC node up with 120μA typical current.
When the voltage on CAGC increases, the gains of the
Table 1. Low-Pass Filter Selection @ 434MHz RF input
mixer and IF amplifier go up, increasing the amplitude of
the audio signal (as labeled in Figure 1), even with only
D[4]
0
0
1
1
D[3]
0
1
0
1
Low-Pass
Filter BW
1170Hz
2350Hz
4700Hz
9400Hz
Maximum
Encoded Bit Rate
1.8kbps
3.6kbps
7.2kbps
14.4kbps
thermal noise at the LNA input. The fast-charge current
is disabled when the audio signal crosses the slicing
threshold, causing DO’ to go high, for the first time.
When an RF signal is applied, a fast attack period
ensues, when 600μA current discharges the CAGC
node to reduce the gain to a proper level. Once the loop
reaches equilibrium, the fast attack current is disabled,
leaving only 15μA to discharge CAGC or 1.5μA to
Table 2. Low-Pass Filter Selection @ 315MHz RF input
charge CAGC. The fast attack current is enabled only
when the RF signal increases faster than the ability of
the AGC loop to track it.
July 2011
10
M9999-071811-A
RadioTech@micrel.com or (408) 944-0800
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相关代理商/技术参数 |
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| 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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