The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as theAD9201,AD9283, andAD9218, for digitizing and post-processing.The IF input signal is fed into two Gilbert cell mixers through an X-AMP®VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature rangeSamples AD8348ARU and evaluation boards AD8348-EVAL are availableOTHER MODULATOR/DEMODULATOR PRODUCTSAD8345250MHz – 1GHz RF/IF ModulatorAD8346800MHz – 2.5GHz ModulatorAD8347800MHz – 2.7GHz DemodulatorAD8349700MHz – 2.7GHz Modulator