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AD8347:  800 MHz TO 2.7 GHz RF / IF Quadrature Demodulator

Product Details

The AD8347 is a single chip, broadband 2.7GHz quadrature demodulator. The part integrates 65dB linear-in-dB AGC, divided between RF input and at the baseband outputs following the mixers. The In-phase and Quadrature signals are brought out off chip for filtering prior to the final output amplifier stage. The final output amplifiers allow the user to adjust the DC common mode level to provide a direct interface into a dual channel I/Q ADC.

With 65dB linear-in-dB gain control, 50MHz demodulation bandwidth and excellent phase and amplitude balance the AD8347 is ideally suited direct conversion radios in point to point and point to multipoint broadband wireless applications.

The AD8347 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 and an evaluation boards part number AD8347-EVAL are available to order.

Other Modulator/Demodulator products:

AD8345 - 250MHz - 1GHz RF/IF Modulator
AD8346 - 2.5 GHz Direct Conversion Quadrature Modulator


  • 800MHz - 2.7GHz RF Input Range
  • Integrated 65dB AGC Amplifiers
  • Integrated Baseband Level Detectors
  • Integrated Baseband Output Amplifiers
  • Single Supply 2.7 to 5.5V with Power Down
  • Quadrature Phase Accuracy 3 degree
  • Amplitude Balance 0.3dB
  • Third Order Intercept IIP3 +12dB
  • Noise Figure 11dB
  • Low LO Drive -10dBm

Functional Block Diagram for AD8347


Title Content Type File Type
AD8347: 0.8 GHz to 2.7 GHz Direct Conversion Quadrature Demodulator Data Sheet (Rev A, 10/2005) (pdf, 623 kB) Data Sheets 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
Techniques Simplify Wireless Transmission  (pdf)
... Approaches That Were Once Thought Too Costly To Implement Now Have New Life, Thanks To The Availability Of Integrated Devices. (Wireless Systems Design, January/February 2003)
Technical Articles PDF
Single Chip Realizes Direct-Conversion Rx  (pdf, 2518 kB)
... Direct-conversion Rxs offer advantages in simplicity compared to conventional superheterodyne approaches, although attention must be paid to some of the trade-offs.
(Microwaves & RF, October 2002)
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 Complementary Products

Recommended PLL's for the AD8347
  • 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, ADF4153.
Recommended Baseband Driver Amplifiers for the AD8347
  • For low noise drivers for low voltage (1.8V) ADC, we recommend the ADA4930-1 or the dual AD4930-2.
  • For selectable gain of 1, 2 or 3, baseband ADC drive, we recommend the low cost, low power single ADA4950-1 or dual ADA4950-2.
  • For a matched pair of digitally programmable VGA's over the range of 4.5dB to 20.25dB in steps of .25dB, we recommend the AD8366.
  • For variable gain and programmable baseband filters, we recommend the ADRF6510.
Recommended Pin Compatible Dual Analog-to-Digital Converters for the AD8347
  • 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.
Recommended Power Solutions

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Price, packaging, availability

AD8347 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8347ARU Status: Production 28 ld TSSOP (4.4mm) 28 Ind Tube, 50 $7.31 $6.76 N  Material Info PCN Purchase
AD8347ARU-REEL7 Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 1000 - $6.76 N  Material Info PCN Purchase
AD8347ARUZ Status: Production 28 ld TSSOP (4.4mm) 28 Ind Tube, 50 $6.33 $5.85 Y  Material Info PCN Purchase Sample
AD8347ARUZ-REEL7 Status: Production 28 ld TSSOP (4.4mm) 28 Ind Reel, 1000 - $5.85 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.

AD8347 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
AD8347-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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