No.AD834

      AD834 is one kind of 500 MHz Four-Quadrant Multiplier.The AD834 is a monolithic laser-trimmed four-quadrant analog multiplier intended for use in high frequency applications, having a transconductance bandwidth (RL = 50 ) in excess of 500 MHz from either of the differential voltage inputs. In multiplier modes, the typical total full-scale error of No.AD834 is 0.5%, dependent on the application mode and the external circuitry. Performance of No.AD834 is relatively insensitive to temperature and supply variations, due to the use of stable biasing based on a bandgap 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. No.AD834 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 of No.AD834 may not need to have high bandwidth.
The transfer No.AD834 function is accurately trimmed such that when X = Y = ±1 V, the differential output is ±4 mA. No.AD834 absolute calibration allows the outputs of two or more AD834s to be summed with precisely equal weighting, independent of the accuracy of the load circuit. The AD834J is specified for use over the commercial temperature range of 0°C to +70°C and is available in an 8-lead DIP package and an 8-lead plastic SOIC package. AD834A is available in cerdip and 8-lead plastic SOIC packages for operation over the industrial temperature range of 40°C to +85°C. The AD834S/883B is specified for operation over the military temperature range of 55°C to +125°C and is available in the 8-lead cerdip package. S-Grade chips are also available.
      No.AD834 has several features such as:DC to >500 MHz Operation;Differential ±1V Full-Scale Inputs;Differential ±4mA Full-Scale Output Current;Low Distortion (0.05% for 0 dBm Input);Supply Voltages from ±4V to ±9V and Low Power (280 mW typical at VS = ±5 V).
      AD834 can be used in High Speed Real Time Computation;Wideband Modulation and Gain Control;Signal Correlation and RF Power Measurement;Voltage Controlled Filters and Oscillators and Linear Keyers for High Resolution Television,Wideband True RMS.