12
9140CINDCO02/10
ATA8741
8. Application
For the blocking of the supply voltage, a capacitor value of C
3
= 68 nF/X7R is recommended. C
1
and C
2
are used to match the loop antenna to the power amplifier, where C
1
typically is
22 pF/NP0 and C
2
is 10.8 pF/NP0 (18 pF + 27 pF in series); for C
2
two capacitors in series
should be used to achieve a better tolerance value and to have the possibility of realizing the
Z
Load,opt
using standard valued capacitors.
Together with the pins and the PCB board wires C
1
forms a series resonance loop that sup-
presses the 1
st
harmonic, hence the position of C
1
on the PCB is important. Normally the best
suppression is achieved when C
1
is placed as close as possible to the pins ANT1 and ANT2.
The loop antenna should not exceed a width of 1.5 mm, otherwise the Q-factor of the loop
antenna is too high.
L
1
(50 nH to 100 nH) can be printed on PCB. C
4
should be selected that the XTO runs on the
load resonance frequency of the crystal. Normally, a value of 12 pF results for a 15 pF
load-capacitance crystal.
Figure 8-1. ESD Protection Circuit
CLK
VS
PA_ENABLE
XTAL
ANT2
ENABLE
ANT1
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ATA8742-PXQW
MCU W/TRANSMITTER ASK/FSK 24QFN
ATA8743-PXQW
MCU W/TRANSMITTER ASK/FSK 24QFN
ATAVRRZ200
KIT DEMO AT86RF230
AV101-12LF
ATTENUATOR HIP3 0.70-1GHZ 8-SOIC
AV102-12LF
ATTENUATOR HIP3 1.7-2GHZ 8SOIC
AV113-12LF
ATTENUATOR HIP3 2.1-2.3GHZ 8SOIC
AXUV100G
SENSOR ELECTRON DETECTION
B0205F50200AHF
XFRMR BALUN RF 200-500MHZ 1608
相关代理商/技术参数
ATA8742
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with UHF ASK/FSK Transmitter
ATA8742C- PXQW
制造商:Atmel Corporation 功能描述:Embedded C incl RF Tx for 433 MHz
ATA8742C-PXQW
功能描述:8位微控制器 -MCU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATA8742C-PXQW-1
功能描述:EMBEDDED INCL RF TX FOR 433 MHZ 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 频率:429MHz ~ 439MHz 应用:通用 调制或协议:UHF 数据速率（最大值）:32kbps 功率 - 输出:7.5dBm 电流 - 传输:9.8mA 数据接口:SPI 天线连接器:PCB，表面贴装 存储容量:4kB 闪存，256B EEPROM，256B SRAM 特性:- 电压 - 电源:2 V ~ 4 V 工作温度:-40°C ~ 85°C 封装/外壳:24-VQFN 裸露焊盘 标准包装:1
ATA8742-PXQW
功能描述:8位微控制器 -MCU Embedded uC incl RF Tx for 433 MHz
RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATA8743
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Microcontroller with UHF ASK/FSK Transmitter
ATA8743C- PXQW
功能描述:8位微控制器 -MCU Embedded uC incl RF Tx for 315 MHz
RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATA8743C-PXQW
制造商:Atmel Corporation 功能描述:EMBEDDED ?C INCL RF TX FOR 868 MHZ - Trays 制造商:Atmel Corporation 功能描述:EMBEDDED C INCL 868MHZ TX