- 您现在的位置：买卖IC网 > Datasheet目录474 > MAX7058EVKIT+ (Maxim Integrated)EVAL KIT MAX7058 Datasheet资料下载
参数资料
| 型号： | MAX7058EVKIT+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT MAX7058 |
| 标准包装： | 1 |
| 系列： | * |
315MHz/390MHz Dual-Frequency
ASK Transmitter
Applications Information
Output Matching to 50 Ω
When matched to a 50 Ω system, the MAX7058’s PA is
capable of delivering +10dBm of output power at V DD
= +2.7V. The output of the PA is an open-drain transis-
tor, which has internal selectable shunt tuning capaci-
tors for impedance matching (see the Variable
Capacitor section). It is connected to V DD through a
pullup inductor for proper biasing. The internal selec-
table shunt capacitors make it easy for tuning when
changing the output frequency. The pullup inductance
from the PAOUT to V DD or ROUT serves three main
purposes: resonating the capacitive PA output, provid-
ing biasing for the PA, and acting as a high-frequency
choke to prevent RF energy from coupling into V DD .
The pi network between the PA output and the antenna
also forms a lowpass filter that provides attenuation for
the higher-order harmonics.
Output Matching to PCB Loop Antenna
In many applications, the MAX7058 must be imped-
ance-matched to a small loop antenna. The antenna is
usually fabricated out of a copper trace on a PCB in a
rectangular, circular, or square pattern. The antenna
has impedance that consists of a lossy component and
a radiative component. To achieve high radiating effi-
ciency, the radiative component should be as high as
possible, while minimizing the lossy component. In
addition, the loop antenna has an inherent loop induc-
tance associated with it (assuming the antenna is termi-
nated to ground). In a typical application, the induc-
tance of the loop antenna is approximately 50nH to
100nH. The radiative and lossy impedances may be
anywhere from a few tenths of an ohm to 5 Ω or 10 Ω .
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. At high-frequency inputs and
outputs, use controlled-impedance lines and keep
them as short as possible to minimize losses and radi-
ation. At high frequencies, trace lengths that are on
the order of λ /10 or longer act as antennas, where λ is
the wavelength.
Keeping the traces short also reduces parasitic induc-
tance. Generally, one inch of PCB trace adds about
20nH of parasitic inductance. The parasitic inductance
can have a dramatic effect on the effective inductance
of a passive component. For example, a 0.5in trace
connecting to a 100nH inductor adds an extra 10nH of
inductance, or 10%.
To reduce parasitic inductance, use wider traces and a
solid ground or power plane below the signal traces.
Using a solid ground plane can reduce the parasitic
inductance from approximately 20nH/in to 7nH/in. Also,
use low-inductance connections to the ground plane
and place decoupling capacitors as close as possible
to all VDD pins.
Chip Information
PROCESS: CMOS
______________________________________________________________________________________
11
相关PDF资料 |
PDF描述 |
|---|---|
| MAX7060EVKIT+ | EVAL KIT MAX7060 |
| MAX8506EVKIT | EVAL KIT FOR MAX8506 |
| MAX8582ETB+T | IC CONV 1.5MHZ CDMA 10-TDFN |
| MAX9635ESA+ | IC AMBIENT LIGHT SENSOR 8NSOIC |
| MAX9930EVKIT+ | KIT EVAL FOR MAX9930 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7058EVKIT+ | 功能描述:射频开发工具 MAX7058 Eval Kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| MAX705C/D | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX705CPA | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX705CPA+ | 功能描述:监控电路 Single uPower Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX705CSA | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。