- 您现在的位置：买卖IC网 > PDF目录18777 > RFRXD0420-I/LQ (Microchip Technology)MODULE RCVR 315/433MHZ ASK/FSK PDF资料下载
参数资料
| 型号： | RFRXD0420-I/LQ |
| 厂商： | Microchip Technology |
| 文件页数： | 11/32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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页当前第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页
rfRXD0420/0920
3.1.3
PLL LOOP FILTER
The SAW filter has the added advantage of filtering
An external PLL loop filter is connected to pin LF
(Pin 29). The loop filter controls the dynamic behavior
of the PLL, primarily lock time and spur levels. Gener-
ally, the PLL lock time is a small fraction of the overall
receiver start-up time (see Electrical Characteristics
Section). The crystal oscillator is the largest contributor
to start-up time. Thus, for the majority of applications,
design loop filter values for a wide loop bandwidth to
suppress noise. Figure 3-4 illustrates an example filter
circuit for a wide frequency range suitable for a majority
of applications.
wide-band noise and improving the signal-to-noise
ratio (SNR) of the receiver.
SAW filters require impedance matching. Refer to the
manufacturers' data sheet and application notes for
SAW filter pinouts, specified impedances and recom-
mended matching circuits. Figure 3-5 shows a SAW
filter example circuit.
A secondary purpose of the preselector is to provide
impedance matching between the antenna and LNA IN
(Pin 31).
3.1.5
ANTENNA
FIGURE 3-4:
PLL LOOP FILTER EXAMPLE
CIRCUIT
29
Receiver performance and device packaging influence
antenna selection. There are many third-party anten-
nas to choose from. Third-party antennas typically
have an impedance of 50 ?. The preselector compo-
nents should be chosen to match the impedance of the
antenna to the LNA IN
(Pin 31) impedance of
C2
OPTIONAL
C1
1000 pF
R1
10 k ?
26 ? || 2 pF.
The designer can chose to use a simple wire antenna.
The length of the wire should be one-quarter the wave-
length ( λ) of the receive frequency. For example, the
wavelength of 433.92 MHz is:
λ = c / f rf where c = 3 x 10 8 m/s
λ = 3 x 10 8 m/s / 433.92 x 10 6 Hz
3.1.4
PRESELECTOR
λ = 0.69 m
Receiver performance is heavily influenced by the
preselector (also known as the front-end filter). The
purpose of the preselector is to filter unwanted signals
and noise from entering the receiver.
The most important unwanted signal is the image
frequency (f rf-image ). Pay particular attention to the
therefore
0.25 λ = 17.3 cm or 6.8 inches
Finally, the wire antenna should be impedance
matched to the preselector. The typical impedance of a
one-quarter wavelength wire antenna is 36 ?.
image frequency calculated in Figure 3-3 as this will be
3.1.6
LNA GAIN
the frequency that needs to be filtered out by the
preselector.
The preselector can be designed using a simple LC
filter or a Surface Acoustic Wave (SAW) filter. A simple
LC filter provides a low cost solution but will have the
least effect filtering the image frequency. A SAW filter
can effectively filter the image frequency with a
minimum of 40 dB attenuation.
For a majority of applications, LNA GAIN can be tied to
Vss (ground) enabling High Gain mode. If the applica-
tion requires short range communications, LNA GAIN
can be tied to V DD (pulled up) enabling Low Gain mode.
More Information on LNA GAIN operation can be found
in the Circuit Description section.
FIGURE 3-5:
SAW FILTER EXAMPLE CIRCUIT
Antenna
C1
L1
F1 SAW Filter
2 Input Output 5
1 Input Gnd Output Gnd 6
Case Gnd
L2
C2
LNA IN
3 4 7 8
Note:
Refer to SAW filter manufacturer ’s data sheet for pin outs
and values for impedance matching components.
? 2003 Microchip Technology Inc.
Preliminary
DS70090A-page 11
相关PDF资料 |
PDF描述 |
|---|---|
| M50100TB1600 | MODULE POWER 100A 1600V 3PH BRDG |
| RXM-900-HP3-SPS | RECEIVER RF 902-928MHZ 8P/100S |
| M50100SB1600 | MODULE POWER 100A 1600V BRIDGE |
| M50100TB400 | MODULE POWER 100A 400V 3PH BRDG |
| M5060TB1600 | MODULE POWER 60A 1600V 3PH BRDG |
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: |
发布紧急采购，3分钟左右您将得到回复。