GENERAL DESCRIPTION
The AD834 is a monolithic, laser-trimmed four-quadrant analog multiplier intended for use in high frequency applications, with a transconductance bandwidth (RL = 50 Ω) in excess of 500 MHz from either of the differential voltage inputs. In multiplier modes, the typical total full-scale error is 0.5%, dependent on the application mode and the external circuitry. Performance is relatively insensitive to temperature and supply variations due to the use of stable biasing based on a band gap reference generator and other design features.
To preserve the full bandwidth potential of the high speed bipolar process used to fabricate the AD834, the outputs appear as a differential pair of currents at open collectors. To provide a single-ended ground referenced voltage output, some form of external current-to-voltage conversion is needed. This may take the form of a wideband transformer, balun, or active circuitry such as an op amp. In some applications (such as power measurement), the subsequent signal processing may not need to have high bandwidth.

FEATURES
  DC to >500 MHz operation
  Differential ±1 V full-scale inputs
  Differential ±4 mA full-scale output current
  Low distortion (≤0.05% for 0 dBm input)
  Supply voltages from ±4 V to ±9 V
  Low power (280 mW typical at VS = ±5 V)
 
APPLICATIONS
  High speed real time computation
  Wideband modulation and gain control
  Signal correlation and RF power measurement
  Voltage controlled filters and oscillators
  Linear keyers for high resolution television
  Wideband true RMS