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| 型号： | RFRXD0420-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 16/32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
3.2.2.1
DYNAMIC REFERENCE VOLTAGE
Selection of component values for R1 and C2 is an
A dynamic reference voltage can be derived by averag-
ing the received signal with a low-pass filter. The exam-
ple ASK application circuit shown in Figure 3-9, the
low-pass filter is formed by R1 and C2. The output of
the low-pass filter is then fed to OPA-.
The setting of the R1-C2 time constant depends on the
ratio of logical ones versus zeros and a trade off in
stability versus receiver reaction time. If the received
signal has an even number of logical ones versus
zeros, the time constant can be set relatively short.
Thus the reference voltage can react quickly to
changes in the received signal amplitude and differ-
ences in transmitters. However, it may not be as stable
and can fluctuate with the ratio of logical ones and
iterative process. First start with a time constant
between 10 to 100 times the signal rate. Second, view
the reference voltage against the RSSI signal to
determine if the values are suitable. Figure 3-12 is an
oscilloscope screen capture of an incoming RF square
wave modulated signal (ASK on-off keying). The top
trace is the data output of OPA (Pin 18). The two
bottom traces are the RSSI signal (Pin 21, bottom
square wave) and generated reference voltage (Pin 19,
bottom trace centered in the RSSI square wave). The
goal is to select values for R1 and C2 such that the
reference voltage is in the middle of the RSSI signal.
This reference voltage level provides the optimum data
comparison of the incoming data signal.
zeros. If the time constant is set long, the reference
3.2.2.2
STATIC REFERENCE VOLTAGE
voltage will be more stable. However, the receiver
cannot react as quickly upon the reception of a
received signal.
A static reference voltage can be derived by a voltage
divider network.
FIGURE 3-12:
RSSI AND REFERENCE VOLTAGE COMPARISON
OPA
(Pin 18)
RSSI
OPA-
(Pin 19)
(Pin 21)
DS70090A-page 16
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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