AD831 Analog Devices, AD831 Datasheet

AD831

Manufacturer Part Number

AD831

Description

High-Performance, Low Distortion 500-MHz Mixer

Manufacturer

Analog Devices

Datasheet

1.AD831.pdf (16 pages)

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PRODUCT DESCRIPTION

The AD831 is a low distortion, wide dynamic range, monolithic

mixer for use in such applications as RF to IF down conversion

in HF and VHF receivers, the second mixer in DMR base sta-

tions, direct-to-baseband conversion, quadrature modula-

tion and demodulation, and doppler-shift detection in ultra-

sound imaging applications. The mixer includes an LO driver

and a low-noise output amplifier and provides both user-pro-

grammable power consumption and 3rd-order intercept point.

The AD831 provides a +24 dBm third-order intercept point for

–10 dBm LO power, thus improving system performance and

reducing system cost compared to passive mixers, by eliminating

the need for a high power LO driver and its attendant shielding

and isolation problems.

The RF, IF, and LO ports may be dc or ac coupled when the

mixer is operating from 5 V supplies or ac coupled when oper-

ating from a single supply of 9 V minimum. The mixer operates

with RF and LO inputs as high as 500 MHz.

The mixer’s IF output is available as either a differential current

output or a single-ended voltage output. The differential output

is from a pair of open collectors and may be ac coupled via a

transformer or capacitor to provide a 250 MHz output band-

width. In down-conversion applications, a single capacitor con-

nected across these outputs implements a low-pass filter to

reduce harmonics directly at the mixer core, simplifying output

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Doubly-Balanced Mixer

Low Distortion

Low LO Drive Required: –10 dBm

Bandwidth

Single or Dual Supply Operation

DC Coupled Using Dual Supplies

User-Programmable Power Consumption

APPLICATIONS

High Performance RF/IF Mixer

Direct to Baseband Conversion

Image-Reject Mixers

I/Q Modulators and Demodulators

+24 dBm Third Order Intercept (IP3)

+10 dBm 1 dB Compression Point

500 MHz RF and LO Input Bandwidths

250 MHz Differential Current IF Output

DC to >200 MHz Single-Ended Voltage IF Output

All Ports May Be DC Coupled

No Lower Frequency Limit—Operation to DC

filtering. When building a quadrature-amplitude modulator or

image reject mixer, the differential current outputs of two

AD831s may be summed by connecting them together.

An integral low noise amplifier provides a single-ended voltage

output and can drive such low impedance loads as filters, 50

amplifier inputs, and A/D converters. Its small signal bandwidth

exceeds 200 MHz. A single resistor connected between pins

OUT and FB sets its gain. The amplifier’s low dc offset allows

its use in such direct-coupled applications as direct-to-baseband

conversion and quadrature-amplitude demodulation.

The mixer’s SSB noise figure is 10.3 dB at 70 MHz using its

output amplifier and optimum source impedance. Unlike pas-

sive mixers, the AD831 has no insertion loss and does not re-

quire an external diplexer or passive termination.

A programmable-bias feature allows the user to reduce power

consumption, with a reduction in the 1 dB compression point

and third-order intercept. This permits a tradeoff between dy-

namic range and power consumption. For example, the AD831

may be used as a second mixer in cellular and two-way radio

base stations at reduced power while still providing a substantial

performance improvement over passive solutions.

PRODUCT HIGHLIGHTS

1. –10 dBm LO Drive for a +24 dBm Output Referred Third

2. Single-Ended Voltage Output

3. High Port-to-Port Isolation

4. No Insertion Loss

5. Single or Dual Supply Operation

6. 10.3 dB Noise Figure

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

Order Intercept Point

FUNCTIONAL BLOCK DIAGRAM

GND

RFN

RFP

Low Distortion Mixer

AD831

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OUT

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AD831

Fax: 617/326-8703

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