ADI ADRF6850宽带正交解调解决方案

ADI 公司的ADRF6850是高度集成宽带（100MHz 到1000MHz）正交解调器，频率合成器和可变增益放大器（VGA），并集成了VCO，提供的频率分辨率优于1Hz，增益控制范围60dB，0dBm时的输入P1dB为+12dBm，输入IP3为+22.5dBm,工作电压3.15 V 到 3.45 V，主要用在宽带通信，蜂窝通信和卫星通信。本文介绍了ADRF6850主要特性，功能方框图和PCB电路图以及材料清单（BOM）。
The ADRF6850 is a highly integrated broadband quadrature demodulator, frequency synthesizer, and variable gain amplifier (VGA). The device covers an operating frequency range from 100 MHz to 1000 MHz for use in both narrow-band and wideband communications applications, performing quadrature demodu-lation from IF directly to baseband frequencies.
The ADRF6850 demodulator includes a high modulus fractional-N frequency synthesizer with integrated VCO, providing better than 1 Hz frequency resolution, and a 60 dB gain control range provided by a front-end VGA.
Control of all the on-chip registers is through a user-selected SPI interface or I2C interface. The device operates from a single power supply ranging from 3.15 V to 3.45 V.
ADRF6850主要特性：
IQ quadrature demodulator
Integrated fractional-N PLL and VCO
Gain control range: 60 dB
Input frequency range: 100 MHz to 1000 MHz
Input P1dB: +12 dBm at 0 dB gain
Input IP3: +22.5 dBm at 0 dB gain
Noise figure: 11 dB at >39 dB gain, 49 dB at 0 dB gain
Baseband 1 dB bandwidth: 250 MHz in wideband mode, 50 MHz in narrow-band mode
SPI/I2C serial interface
Power supply: +3.3 V/350 mA
ADRF6850应用：
Broadband communications
Cellular communications
Satellite communications

 图1。ADRF6850功能方框图

图2。ADRF6850 PCB电路图
PCB电路图材料清单（BOM）：

详情请见：
http://www.analog.com/static/imported-files/data_sheets/ADRF6850.pdf