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AD8345:  140 MHz TO 1000 MHz Quadrature Modulator

Product Details

The AD8345 is a silicon RFIC quadrature modulator, designed for use from 140 MHz to 1000 MHz. The part provides a very low noise floor and high output power supporting a significant improvement in output dynamic range. The AD8345 needs a low LO drive level and provides a fully specified 50 Ω buffered output.

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

Additionally the AD8345 has been tested and supports the requirements as an IF modulator within CDMA/GSM/W-CDMA cellular infrastructure equipment and as a direct conversion modulator for the 800 – 900 MHz cellular bands.

The AD8345 is supplied in 16-lead Thin Shrunk Small Outline (TSSOP) package with exposed paddle, and fully specified over –40°C to +85°C temperature range.

Availability Samples part number (AD8345ARE) and an evaluation board, part number (AD8345-EVAL) are available.

Other Modulator / Demodulator Products

AD8346 – 800 MHz to 2.5 GHz Lower Power Direct Up-Conversion Modulator

AD8347 – 800 MHz to 2.7 GHz Direct Conversion Demodulator

AD8349 – 700 MHz to 2.7 GHz Low Noise, Higher Output Drive, RF Modulator


  • Output frequency range 140 MHz to 1000 MHz
  • I/Q baseband frequency range dc – 80 MHz output power +2.5 dBm P1 dB
  • Noise floor –155 dBm/Hz
  • Quadrature phase accuracy 0.5 deg rms
  • Amplitude balance 0.2 dB
  • Single 2.7 V – 5.5 V supply
  • Pin compatible with AD8346 / AD8349

Functional Block Diagram for AD8345


Title Content Type File Type
AD8345: 140 MHZ to 1000 MHz Quadrature Modulator Data Sheet  (Rev B, 12/2005) (pdf, 1013 kB) Data Sheets PDF
AN-1039: Correcting Imperfections in IQ Modulators to Improve RF Signal Fidelity  (pdf, 202 kB) Application Notes PDF
AN-924: Digital Quadrature Modulator Gain  (pdf, 105 kB) Application Notes PDF
Simplifying Direct-Conversion Tx Paths in Wireless Designs
(CommsDesign, 11/6/2002)
Technical Articles HTML
Single-Sideband Upconversion of Quadrature DDS Signals to the 800-to-2500MHz  (pdf, 328 kB) Technical Articles PDF
AD8348 is among EDN's Top 100 Products
(EDN, December 2003)
Product Reviews HTML
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Overview PDF
Leading Inside Advertorials: Broadband I/Q Modulator Eases Radio Design  (pdf, 69 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
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 3.60.10
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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended PLL's for the AD8345

  • For high performance with integrated VCO, we recommend the ADF4350.
  • For lower cost, power and size with integrated VCO, we recommend the ADF4360-X family of fixed frequency PLL's.
  • For higher performance, higher frequency and faster locktimes, we recommend the discrete Integer-N, ADF4106 or the discrete Fractional-N, ADF4156.
Recommended RF/IF Driver Amplifiers and Gain Blocks for the AD8345
  • For the full listing of frequency and driving level options, we recommend the ADL5xxx selection table.
Recommended Differential Dual Baseband TxDAC's for the AD8345
  • For generating differential I and Q currents up to 125MSPS, we recommend the AD911X pin compatible family of low power, small size, TxDAC's like the AD9117.
  • For even lower power requirements up to 125MSPS, we recommend the pin compatible AD971X family of TxDAC's like the AD9717.
  • For higher bandwidths using data rates up to 250MSPS, with low noise and IMD, we recommend the pin compatible AD974X family of CMOS TxDAC's like the AD9747 or AD9125 if interpolation is required.
  • For direct conversion transmit applications up to 500 MSPS, we suggest the pin compatible AD978X family of LVDS TxDAC's like the AD9783 or AD9122 if interpolation is required.
Recommended Power Solutions

  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD8345 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8345ARE Status: Production 16 ld TSSOP_EP (3.0mm pad size) 16 Ind Tube, 96 $6.09 $5.81 N  Material Info PCN Purchase
AD8345ARE-REEL7 Status: Production 16 ld TSSOP_EP (3.0mm pad size) 16 Ind Reel, 1000 - $5.81 N  Material Info PCN Purchase
AD8345AREZ Status: Production 16 ld TSSOP_EP (3.0mm pad size) 16 Ind Tube, 96 $5.27 $5.02 Y  Material Info PCN Purchase Sample
AD8345AREZ-RL7 Status: Production 16 ld TSSOP_EP (3.0mm pad size) 16 Ind Reel, 1000 - $5.02 Y  Material Info PCN 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.

AD8345 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8345-EVALZ Status: Production Evaluation Board $100.19 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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