2.5 GHz Direct Conversion Quadrature Modulator

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Product Details

The AD8346 is a silicon I / Q quadrature modulator, designed to be used from 800 MHz to 2.5 GHz. The part is optimized for lower power applications, yet provides a very low noise floor and high output power for the given supply current.

The AD8346 requires only –10 dBm LO drive level and provides a fully specified 50 ohm buffered output.

The part provides excellent amplitude and phase balance and sideband suppression specifications to enable higher order / capacity QAM modulated radios.

Additionally the AD8346 has been tested and provides –72 dBc ACPR when used in a direct up-conversion CDMA IS95 modulator.

The AD8346 is supplied in 16-lead Thin Shrunk Small Outline (TSSOP) package, and fully specified over –40 to 85 degC temperature range.

Samples part number (AD8346ARU) and an evaluation board, part number (AD8346-EVAL) are available

Other Modulator / Demodulator Products

AD8345 - 250 MHz - 1 GHz RF / IF Quadrature Modulator

AD8347 – 800 MHz - 2.7 GHz RF / IF Quadrature Demodulator

AD8349 – 800 MHz - 2.7 GHz Direct Up-Conversion Quadrature Modulator

Product Lifecycle

checked Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits


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Product Details

AD8346-EVALZ is 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/200 mA power supply which should be connected to the clip leads labeled VPOS and GND. The LO and baseband inputs (which should be biased at 1.2 V) are applied to edge-mounted SMA-type RF connectors (labeled LO, IP, IN, QP, and QN). The AD8346 output is available at the SMA connector labeled VOUT.

Tools & Simulations

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Design Tools

Product Recommendations

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AD8346 Companion parts

Recommended Differential Dual Baseband TxDAC's

  • For direct conversion transmit applications up to 500 MSPS , we recommend the AD9783, AD9122 or the AD9122 .
  • For ultrlow noise and IMD at 1000MSPS , we recommend the AD9125, AD9122, AD9122, AD9125 or the AD9146 .
  • For generating differential I and Q currents up to 125MSPS , we recommend the AD9117 .
  • For even lower power requirements up to 125MSPS , we recommend the AD9717 .
  • For higher bandwidths using data rates up to 250MSPS, with low noise and IMD , we recommend the AD9747, AD9125 or the AD9125 .

Recommended PLL's

  • For high performance with integrated VCO , we recommend the ADF4350 .
  • For higher performance, higher frequency and faster locktimes , we recommend the ADF4106 or the ADF4156 .
  • For lower cost, power and size with integrated VCO

Recommended RF/IF Driver Amplifiers and Gain Blocks

  • For the full listing of frequency and driving level options

Reference Materials

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Design Resources

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD8346 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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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.

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Evaluation Boards Pricing displayed is based on 1-piece.
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.