GENERAL DESCRIPTION:

The AD835 is a complete four-quadrant, voltage output analogmultiplier, fabricated on an advanced dielectrically isolatedcomplementary bipolar process. It generates the linear productof its X and Y voltage inputs with a −3 dB output bandwidth of250 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 istypically 20 ns.Its differential multiplication inputs (X, Y) and its summinginput (Z) are at high impedance. The low impedance outputvoltage (W) can provide up to ±2.5 V and drive loads as low as25 Ω. Normal operation is from ±5 V supplies.Though providing state-of-the-art speed, the AD835 is simpleto use and versatile. For example, as well as permitting theaddition of a signal at the output, the Z input provides themeans 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 an8-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