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AD8348:  50 MHz TO 1000 MHz Quadrature Demodulator

Product Details

The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and post-processing.

The IF input signal is fed into two Gilbert cell mixers through an X-AMP® VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.

The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the –40 to +85 C temperature range

Samples AD8348ARU and evaluation boards AD8348-EVAL are available

Other Modulator/Demodulator products

    AD8345 250MHz – 1GHz RF/IF Modulator
    AD8346 800MHz – 2.5GHz Modulator
    AD8347 800MHz – 2.7GHz Demodulator
    AD8349 700MHz – 2.7GHz Modulator


  • 50 MHz – 1000 MHz RF input range
  • Integrated 45 dB linear-in-dB VGA IF amplifier
  • Integrated baseband output amplifiers
  • Demodulation bandwidth 75 MHz
  • Quadrature phase accuracy 0.5°
  • Amplitude balance 0.25 dB
  • Third order intercept IIP3
    +28 dBm (min gain)
  • Noise figure 11 dB (max gain)
  • Low LO drive –10 dBm
  • Single supply 2.7 V to 5.5 V with power down

Functional Block Diagram for AD8348


Title Content Type File Type
AD8348: 50-1000 MHz Quadrature Demodulator Data Sheet  (Rev A, 05/2006) (pdf, 922 kB) Data Sheets PDF
AN-924: Digital Quadrature Modulator Gain  (pdf, 105 kB) Application Notes PDF
Optimizing Receiver Performance Through Error Vector Analysis  (htm)
by Eric Newman, Analog Devices Inc. (Microwave Product Digest, October 2004)
Technical Articles HTM
Simplifying Direct-Conversion Tx Paths in Wireless Designs
(CommsDesign, 11/6/2002)
Technical Articles HTML
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 AD8348

  • 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 Baseband Driver Amplifiers for the AD8348
  • For low noise drivers in low voltage (1.8V) ADC applications, we recommend the ADA4930-1 or the dual ADA4930-2.
  • For selectable gains of 1, 2 or 3, we recommend the low cost, low power ADA4950-1 or the dual ADA4950-2.
  • For a digital programmable VGA, we recommend the AD8366.
  • For a differential RF/IF amplifier, we recommend the ADL5562 or the ADL5565.
  • For variable gain and programmable baseband filters, we recommend the ADRF6510 or the ADRF6516.
Recommended Dual Analog-to-Digital Converters for the AD8348
  • For 16-bit performance, low power and high sampling rate, we recommend the AD9268 or AD9650.
  • For 14-bit performance, low power and high sampling rate, we recommend the AD9258 or AD9251.

  • For 12-bit performance, low power, low cost and ease of use, we recommend the AD9231.
  • For 16-bit performance, multistage differential pipeline architecture with integrated quadrature error correction (QEC), we recommend the AD9269.
  • For 16-bit performance, continuous time sigma delta architecture with integrated QEC, we recommend the AD9262.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD8348 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8348ARU Status: Production 28 ld TSSOP 28 Ind Tube, 50 $6.42 $5.80 N  Material Info PCN Purchase
AD8348ARU-REEL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $5.80 N  Material Info PCN Purchase
AD8348ARUZ Status: Production 28 ld TSSOP 28 Ind Tube, 50 $5.56 $5.01 Y  Material Info PCN Purchase Sample
AD8348ARUZ-REEL7 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $5.01 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.

AD8348 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8348-EVALZ Status: Production Evaluation Board $200.00 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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