The AD8348 is a wideband
Quadrature demodulator, integrated intermediate frequency (IF) variable gain amplifier (VGA) and
Baseband amplifier, suitable for communication receivers, can perform quadrature demodulation from IF directly to baseband frequency. The baseband amplifier can interface directly with dual ADCs, such as the AD9201, AD9283, and AD9218, for digitization and postprocessing.
The IF input signal is fed into two Gilbert mixers via the X-AMP® VGA. The IF VGA provides 44 dB of gain control. Precision gain control circuitry sets the linear-dB gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter uses a divider by 2 to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.
Manufactured on an advanced bipolar process, the AD8348 operates from a single 3 V or 5 V supply and is available in a space-saving 28-lead ultra-thin compact form factor (TSSOP) package specified over the –40ºC to +85ºC temperature range.
Sample and evaluation boards are available in AD8348ARU and AD8348-EVAL, respectively.
Other modulator/demodulator products
AD8345250MHz – 1GHz RF/IF modulator
AD8346800MHz – 2.5GHz modulator
AD8347800MHz – 2.7GHz demodulator
AD8349700MHz – 2.7GHz modulator