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AD831:  High-Performance, Low Distortion 500 MHz Mixer

Product Details


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 stations, direct-to-baseband conversion, quadrature modulation and demodulation, and doppler-shift detection in ultrasound imaging applications. The mixer includes an LO driver and a low-noise output amplifier and provides both user-programmable 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 operating 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 bandwidth. In down-conversion applications, a single capacitor connected across these outputs implements a low-pass filter to reduce harmonics directly at the mixer core, simplifying output 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 W 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 passive mixers, the AD831 has no insertion loss and does not require 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 dynamic 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.

FEATURES and BENEFITS

  • Doubly Balanced Mixer
  • Low Distortion
    +24 dBm Third Order Intercept (IP3)
    +10 dBm 1 dB Compression Point
  • Bandwidth
    500 MHz RF and LO Input Bandwidths
    250 MHz Differential Current IF Output
    DC to >200 MHz Single-Ended Voltage IF Output
  • Low LO Drive Required: –10 dBm
  • Single- or Dual-Supply Operation
  • DC Coupled Using Dual Supplies
    All Ports May Be DC Coupled
    No Lower Frequency Limit—Operation
    to DC
  • User-Programmable Power
    Consumption

Functional Block Diagram for AD831

Documentation

Title Content Type File Type
AD831: Low Distortion Mixer Data Sheet  (Rev C, 06/2003) (pdf, 550 kB) Data Sheets PDF
Wideband Radios Need Wide Dynamic Range Converters
(Analog Dialogue, Vol. 29, No. 2, 1995)
Analog Dialogue HTML
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADIsimRF
ADI’s ADIsimRF design tool provides calculations for the most important parameters within the RF signal chain, including cascaded gain, noise figure, IP3, P1dB, and total power consumption.
ADIsim Design/Simulation Tools HTML
ADIsimPLL™- Version 3.43
ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.
ADIsim Design/Simulation Tools HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD831 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD831AP Status: Production 20 ld PLCC 20 Ind Tube, 49 $9.47 $7.90 N  Material Info PCN Purchase
AD831AP-REEL Status: Production 20 ld PLCC 20 Ind Reel, 1000 - $6.83 N  Material Info PCN Purchase
AD831AP-REEL7 Status: Production 20 ld PLCC 20 Ind Reel, 250 - $7.90 N  Material Info PCN Purchase
AD831APZ Status: Production 20 ld PLCC 20 Ind Tube, 49 $8.20 $6.83 Y  Material Info Notify Me Purchase Sample
AD831APZ-REEL Status: Production 20 ld PLCC 20 Ind Reel, 1000 - $6.83 Y  Material Info Notify Me Purchase
AD831APZ-REEL7 Status: Production 20 ld PLCC 20 Ind Reel, 250 - $6.83 Y  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD831 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD831EBZ Status: Production Evaluation Board $101.15 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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