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| 型号： | RFRXD0420-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | MODULE RCVR 315/433MHZ ASK/FSK |
| 产品变化通告： | RFRXD0(4,9)20I/LQ Obsolescence 07/Mar/2012 |
| 标准包装： | 250 |
| 频率： | 300MHz ~ 450MHz |
| 灵敏度： | -106dBm |
| 数据传输率 - 最大： | 80 kbps |
| 调制或协议： | ASK，FM，FSK |
| 应用： | 家庭自动化，遥感，RKE |
| 电流 - 接收： | 9.2mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-LQFP |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 685 (CN2011-ZH PDF) |
| 配用： | DV164102-ND - KIT DEV RFPICKIT KIT 1 |
| 其它名称： | RFRXD0420-I/LQR RFRXD0420-I/LQR-ND |
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rfRXD0420/0920
3.3
Frequency Shift Keying (FSK)
FIGURE 3-14: LC DISCRIMINATOR
Figure 3-13 illustrates an example FSK application
circuit.
EXAMPLE CIRCUIT
3.3.1
IF FILTER CONSIDERATIONS
R1
4.7 k ?
As mentioned in the Section 3.1 above, IF filter band-
width selection is a function of:
C3
0-56 pF
? modulation (ASK, FSK or FM)
? signal bandwidth
? frequency and temperature tolerances of the
transmitter and receiver components
C1
1.0 pF
L1
3.3 μ H
C2
680 pF
The occupied bandwidth of binary FSK signals is 2
times the peak frequency deviation plus 2 times the
signal bandwidth. For example, if the data rate is 2400
bits per second Manchester encoded, the signal band-
width is 4800 baud or 1200 Hz, and if the peak
15
16
frequency deviation is 24 kHz, the minimum bandwidth
of the IF filter is:
IF BW min = (2 x 2400) + (2 x 24000)
IF BW min = 52800 Hz
Add to this value the frequency and temperature
tolerances of the transmitter and receiver components.
FSK signals are more sensitive to group delay varia-
tions of the IF filter. Therefore, a filter with a low group
3.3.2.2 Ceramic Discriminator
A no-tune solution can be constructed with a ceramic
discriminator. Figure 3-15 illustrates an example
ceramic discriminator circuit.
The ceramic discriminator acts as a parallel tuned
circuit at the IF frequency (for example, 10.7 MHz). The
parallel capacitor C3 tunes the ceramic resonator. The
high Q of this circuit enables higher output of the detec-
tor for small frequency deviations. However, smaller
delay variation should be used. As an alternative, a
frequency deviations
require better frequency
filter with wider than required bandwidth can be used
because the group delay variation in the center of the
bandpass will be relatively constant.
tolerances at the transmitter and receiver.
In order to detect wider deviation or off-frequency
signals, the detector bandwidth has to be increased.
3.3.2
FSK DETECTOR
This can be accomplished by reducing the Q of the
tuned circuit. One method is to parallel a resistor
The demodulator (DEMOD) section consists of a phase
detector (MIXER2) and amplifier creating a quadrature
detector (also known as a phase coincidence detector)
to demodulate the IF signal in FSK and FM modulation
applications. The in-phase signal comes directly from
the output of the IF limiting amplifier to MIXER2. The
quadrature signal is created by an external tuned circuit
from the output of the IF limiting amplifier (2IF OUT , Pin
15) AC-coupled to the MIXER2 DEM IN (Pin 16) input.
across the ceramic discriminator. A second is to
increase the value of the coupling capacitor C1
increasing the load on the detector. The result of
reducing the Q of the discriminator will be that the
detector output will be smaller.
FIGURE 3-15: CERAMIC DISCRIMINATOR
EXAMPLE CIRCUIT
3.3.2.1
LC Discriminator
F1
CERAMIC DISCRIMINATOR
The external tuned circuit can be constructed from
simple inductor-capacitor (LC) components. This type
circuit produces and excellent output. However, one of
the elements (L or C) must be tunable. Figure 3-14
illustrates an example LC discriminator circuit using a
tunable capacitor. A similar circuit with a tunable induc-
C1
1.0 pF
C3
10-12 pF
C2
680 pF
tor is also possible. Resistor R1 = 4.7 k ? reduces the
Q of the circuit so that frequency deviations of up to 75
kHz can be demodulated.
15
16
DS70090A-page 18
Preliminary
? 2003 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RFRXD0420T-I/LQ | 功能描述:射频收发器 33 LD 300-450 MHz RF RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| RFRXD0920 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:UHF ASK/FSK/FM Receiver |
| RFRXD0920-I/LQ | 功能描述:射频接收器 868/915 MHz ASK/FSKB 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 |
| RFRXD0920T-I/LQ | 功能描述:射频收发器 32 LD 800-930 MHz RF RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray |
| RFS04ZG-M6 | 制造商:Power-One 功能描述: |
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