GENERAL DESCRIPTION
The AD835 is a complete four-quadrant, voltage output analog multiplier, fabricated on an advanced dielectrically isolated complementary bipolar process. It generates the linear product of its X and Y voltage inputs with a −3 dB output bandwidth of 250 MHz (a small signal rise time of 1 ns). Full-scale (−1 V to +1 V) rise to fall times are 2.5 ns (with a standard RL of 150 Ω), and the settling time to 0.1% under the same conditions is typically 20 ns.
Its differential multiplication inputs (X, Y) and its summing input (Z) are at high impedance. The low impedance output voltage (W) can provide up to ±2.5 V and drive loads as low as 25 Ω. Normal operation is from ±5 V supplies.
Though providing state-of-the-art speed, the AD835 is simple to use and versatile. For example, as well as permitting the addition of a signal at the output, the Z input provides the means to operate the AD835 with voltage gains up to about ×10. In this capacity, the very low product noise of this multiplier (50 nV/√Hz) makes it much more useful than earlier products.
The AD835 is available in an 8-lead PDIP package (N) and an 8-lead SOIC package (R) and is specified to operate over the −40°C to +85°C industrial temperature range.

FEATURES
   Simple: basic function is W = XY + Z
   Complete: minimal external components required
   Very fast: Settles to 0.1% of full scale (FS) in 20 ns
   DC-coupled voltage output simplifies use
   High differential input impedance X, Y, and Z inputs
   Low multiplier noise: 50 nV/√Hz
  
APPLICATIONS
   Very fast multiplication, division, squaring
   Wideband modulation and demodulation
   Phase detection and measurement
   Sinusoidal frequency doubling
   Video gain control and keying
   Voltage-controlled amplifiers and filters