250 MHz, Voltage Output,

4-Quadrant Multiplier

AD835

Rev. D

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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

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

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.

FUNCTIONAL BLOCK DIAGRAM

X1

X2

X = X1 – X2

Z INPUT

Y = Y1 – Y2

AD835

W OUTPUT

Y1

Y2

XY

XY + Z

X1

+

+

Figure 1.

PRODUCT HIGHLIGHTS

1.

The AD835 is the first monolithic 250 MHz, four-quadrant

voltage output multiplier.

2.

Minimal external components are required to apply the

AD835 to a variety of signal processing applications.

3.

High input impedances (100 kΩ||2 pF) make signal source

loading negligible.

4.

High output current capability allows low impedance loads

to be driven.

5.

State-of-the-art noise levels achieved through careful

device optimization and the use of a special low noise,

band gap voltage reference.

6.

Designed to be easy to use and cost effective in applications

that require the use of hybrid or board-level solutions.