The document is an application note (AN-212) by Analog Devices engineers Mark Elbert and Barrie Gilbert regarding the AD834 four-quadrant multiplier. It highlights the device's high speed (up to 800 MHz bandwidth) and accuracy, noting its suitability for HF applications like balanced modulation-demodulation, power measurement, gain control, and video switching.
The AD834 has a useful bandwidth of 800 MHz.
It is faster than the AD539 (60 MHz), AD734 (10 MHz), and AD534 (1 MHz).
The full-scale input voltage is +1 V for both inputs.