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AD9276:  Octal LNA/VGA/AAF/12-Bit ADC and CW I/Q Demodulator

Product Details

The AD9276 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amplifier (VGA) with a low noise preamplifier (LNA); an anti-aliasing filter (AAF); a 12-bit, 10 MSPS to 80 MSPS analog-to-digital converter (ADC); and an I/Q demodulator with programmable phase rotation.

Each channel features a variable gain range of 42 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 52 dB, and an ADC with a conversion rate of up to 80 MSPS. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.

The LNA has a single-ended-to-differential gain that is selectable through the SPI. The LNA input noise is typically 0.75 nV/√Hz at a gain of 21.3 dB, and the combined input-referred noise of the entire channel is 0.85 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 21.3 dB LNA gain, the input SNR is roughly 92 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator. Each demodulator has inde-pendently programmable phase rotation through the SPI with 16 phase settings.

The AD9276 requires a LVPECL-/CMOS-/LVDS-compatible sample rate clock for full performance operation. No external reference or driver components are required for many applications.

The ADC automatically multiplies the sample rate clock for the appropriate LVDS serial data rate. A data clock (DCO±) for capturing data on the output and a frame clock (FCO±) trigger for signaling a new output byte are provided.

Powering down individual channels is supported to increase battery life for portable applications. A standby mode option allows quick power-up for power cycling. In CW Doppler opera-tion, the VGA, AAF, and ADC are powered down. The power of the TGC path scales with selectable ADC speed power modes.

The ADC contains several features designed to maximize flexibility and minimize system cost, such as a programmable clock, data alignment, and programmable digital test pattern generation. The digital test patterns include built-in fixed patterns, built-in pseudo-random patterns, and custom user-defined test patterns entered via the serial port interface.

Fabricated in an advanced CMOS process, the AD9276 is available in a 16 mm × 16 mm, RoHS compliant, 100-lead TQFP. It is specified over the industrial temperature range of −40°C to +85°C.

Product Highlights

  1. Small Footprint - Eight channels are contained in a small, space-saving package. Full TGC path, ADC, and I/Q demodulator contained within a 100-lead, 16 mm × 16 mm TQFP
  2. Low Power - In TGC mode, low power of 195 mW per channel at 40 MSPS. In CW mode, ultralow power of 94 mW per channel
  3. Integrated High Dynamic Range I/Q Demodulator with Phase Rotation
  4. Ease of Use - A data clock output (DCO±) operates up to 480 MHz and supports double data rate (DDR) operation
  5. User Flexibility - Serial port interface (SPI) control offers a wide range of flexible features to meet specific system requirements
  6. Integrated Second-Order Antialiasing Filter - This filter is placed before the ADC and is programmable from 8 MHz to 18 MHz.
  • Medical imaging/ultrasound
  • Automotive radar


  • 8 channels of LNA, VGA, AAF, ADC and I&Q Demodulator
  • Low noise preamplifier (LNA) - Please see data sheet for additional information.
  • Variable gain amplifier (VGA)
    Attenuator range: −42 dB to 0 dB
    Postamp gain: 21 dB/24 dB/27 dB/30 dB
    Linear-in-dB gain control
  • Antialiasing filter (AAF)
    Programmable second-order LPF from 8 MHz to 18 MHz
    Programmable HPF
  • Analog-to-digital converter (ADC) - Please see data sheet for additional information.
  • CW Mode I & Q demodulator
    Invididual programmable phase rotation
    Output dynamic range per channel >160 dBFS/√Hz
  • Low power, 195 mW per channel at 12 bits/40 MSPS (TGC), 94 mW per channel for CW Doppler
  • Flexible power-down modes
  • Overload recovery in <10 ns
  • Fast recovery from low power standby mode, <2 μs
  • 100-lead TQFP-EP

Functional Block Diagram for AD9276

Of Note ...

AD927x Family Overview
For additional ADI Healthcare Products and related information, please visit


Title Content Type File Type
AD9276: Octal LNA/VGA/AAF/12-Bit ADC and CW I/Q Demodulator Data Sheet (Rev 0, 08/2009) (pdf, 932 kB) Data Sheets PDF
UG-016: Evaluation Board User Guide  (pdf, 2602 kB)
Evaluating the AD9276 and AD9277 Octal LNA/VGA/AAF/12-/14-Bit ADCs and CW I/Q Demodulators
User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
AD927x/AD967x Octal Ultrasound Analog Front End (AFE) Product Family Brochure  (pdf, 674 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
ADIsimADC is Analog Devices' Analog-to-Digital Behavioral Model that accurately models the typical performance characteristics of many of our High Speed Converters. The model faithfully reproduces the errors associated with both static and dynamic features such as AC linearity, clock jitter, and many other product specific anomalies.
ADIsim Design/Simulation Tools HTML
AD9276 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

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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.

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Price, packaging, availability

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.

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