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| 型号： | RFRXD0420-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 9/32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
3.0
APPLICATION CIRCUITS
effect the trim capacitor has on the receive frequency
for the rfRXD0420 at 433.92 MHz. Keep in mind that
This section provides general information on applica-
tion circuits for the rfRXD0420/0920 receiver. The
following connections and external components
this graph represents one example circuit and the
actual results depends on the crystal and PCB layout.
provide starting points for designs and list the minimum
circuitry recommended for general purpose
applications.
Performance of the radio system (transmitter and
receiver) is affected by component selection and the
environment in which it operates. Each system design
has its own unique requirements. Specifications for a
particular design requires careful analysis of the appli-
cation and compromises for a practical implementation.
FIGURE 3-2:
434.10
434.05
434.00
433.95
433.90
433.85
433.80
RECEIVE FREQUENCY VS.
TRIM CAPACITANCE
3.1
General
433.75
This subsection lists connections and components that
are common between applications. The following
subsections give specific circuit connections and
components for ASK, FSK and FM applications.
Trim Capacitor (pF)
Note that a 0 ? resistor, in the lower left of the graph,
represents an infinite capacitance. This will be the
3.1.1
BYPASS CAPACITORS
lowest frequency obtainable for the crystal and PCB
combination.
Bypass capacitors should be placed as physically close
as possible to V DD pins 8, 14, 17, 27 and 32
respectively. Additional bypassing and board level low-
pass filtering of the power supply may be required
depending on the application.
Calculation of the crystal frequency requires knowl-
edge of the receive frequency (f rf ) and intermediate
frequency (f if ). Figure 3-3 is a worksheet to assist the
designer in calculating the crystal frequency. Table 3-1
lists crystal frequencies for popular receive frequen-
3.1.2
FREQUENCY PLANNING
cies. Table 3-2 lists crystal parameters required for
ordering crystals. For background information on
The rfRXD0420/0920 receivers are single-conversion
superheterodyne architecture with a single IF
frequency. The receive frequency is set by the crystal
frequency (f XTAL ) and intermediate frequency (f if ). For
a majority of applications an external crystal is
connected to XTAL (Pin 26). Figure 3-1 illustrates an
example circuit with an optional trim capacitor.
crystal selection see Application Note AN826, Crystal
Oscillator Basics and Crystal Selection for rfPIC TM and
PICmicro ? Devices.
TABLE 3-1: CRYSTAL FREQUENCIES FOR
POPULAR RECEIVE
FREQUENCIES
FIGURE 3-1:
XTAL EXAMPLE CIRCUIT
WITH OPTIONAL TRIM
CAPACITOR
Receive
Frequency
315 MHz
Crystal
Frequency
rfRXD0420
20.35625 MHz (2)
26
433.92 MHz
26.45125 MHz (1)
rfRXD0920
C TRIM
(OPTIONAL)
868.3 MHz
915 MHz
26.8 MHz (1)
28.259375 MHz (1)
X1
(1) Low-side injection (2) High-side injection
TABLE 3-2: CRYSTAL PARAMETERS
Parameter
Value
The crystal load capacitance should be specified to
include the internal load capacitance of the XTAL pin of
15 pF plus PCB stray capacitance (approximately 2 to
3 pF). A trim capacitor can be used to trim the crystal
Frequency:
Mode:
Load Capacitance:
(see Figure 3-1)
Fundamental
15-20 pF
on frequency within the limitations of the crystal’s trim
sensitivity and pullability. Figure 3-2 illustrates the
ESR: 60 ? Maximum
These values are for design guidance only.
? 2003 Microchip Technology Inc.
Preliminary
DS70090A-page 9
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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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