GENERAL DESCRIPTION

The AD8347 is a broadband direct quadrature demodulator with RF and baseband automatic gain control (AGC) amplifiers. It is suitable for use in many communications receivers, performing

quadrature demodulation directly to baseband frequencies. The input frequency range is 800 MHz to 2.7 GHz. The outputs can be connected directly to popular A-to-D converters such as the

AD9201and AD9283. The RF input signal goes through two stages of variable gain amplifiers prior to two Gilbert-cell mixers. The LO quadrature phase splitter employs polyphase filters to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range. Separate I and Q channel variable gain amplifiers follow the baseband outputs of the mixers. The

RF and baseband amplifiers together provide 69.5 dB of gain control. A precision control circuit sets the linear-in-dB RF gain response to the gain control voltage.

FEATURES

Integrated RF and baseband AGC amplifiers

Quadrature phase accuracy 1° typ

I/Q amplitude balance 0.3 dB typ

Third-order intercept (IIP3) +11.5 dBm @ min gain

Noise figure 11 dB @ max gain

AGC range 69.5 dB

Baseband level control circuit

Low LO drive −8 dBm

ADC-compatible I/Q outputs

Single supply 2.7 V to 5.5 V

Power-down mode

28-lead TSSOP package

APPLICATIONS

Cellular base stations

Radio links

Wireless local loop

IF broadband demodulators

RF instrumentation

Satellite modems

AD8347-EVAL属于开发板，套件，编程器 > 射频评估和开发套件，开发板。亚德诺半导体技术有限公司制造生产的AD8347-EVAL射频评估和开发套件，开发板本系列中的产品适用于在已知实施环境中，提供能访问射频相关器件的功能或者有助于访问该功能。所含的焦点产品范围从射频信号链元器件（如放大器和检测器）到模块化收发器，以及不直接包含焦点产品的适配器硬件，但此类硬件可供方便地访问用户单独提供的特定射频产品或系列。