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AD9271:  Octal LNA/VGA/AAF/ADC and Crosspoint Switch

Product Details


The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amp-lifier (VGA) with low noise preamplifier (LNA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital converter (ADC).

Each channel features a variable gain range of 30 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 40 dB, and an ADC with a conversion rate of up to 50 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 1.2 nV/√Hz, and the combined input-referred noise of the entire channel is 1.4 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 15.6 dB LNA gain, the input SNR is roughly 86 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8 × 6 differential crosspoint switch. The switch is programmable through the SPI.

Applications

  • Medical imaging/ultrasound
  • Automotive radar

FEATURES and BENEFITS

  • 8 channels of LNA, VGA, AAF, and ADC
  • Low noise preamplifier (LNA)
    Input-referred noise = 1.1 nV/√Hz @ 5 MHz typical, gain = 18 dB
    SPI-programmable gain = 14 dB/15.6 dB/18 dB
    Single-ended input; VIN maximum = 400 mV p-p/333 mV p-p/250 mV p-p
  • Dual-mode active input impedance matching
    Bandwidth (BW) > 70 MHz
    Full-scale (FS) output = 2 V p-p differential
  • Variable gain amplifier (VGA)
    Gain range = −6 dB to +24 dB
    Linear-in-dB gain control
  • Antialiasing filter (AAF)
    3rd-order Butterworth cutoff
    Programmable from 8 MHz to 18 MHz
  • See Data Sheet for Additional Information

Functional Block Diagram for AD9271

Documentation

Title Content Type File Type
AD9271: Octal LNA/VGA/AAF/ADC and Crosspoint Switch Data Sheet (Rev B, 05/2009) (pdf, 2195 kB) Data Sheets PDF
AN-1142: Techniques for High Speed ADC PCB Layout  (pdf, 392 kB) Application Notes PDF
AN-878: High Speed ADC SPI Control Software  (pdf, 585 kB) Application Notes PDF
AN-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 kB) Application Notes PDF
AN-586: LVDS Outputs for High Speed A/D Converters  (pdf, 207 kB)
High Speed ADCs Uses LVDS (Low-Voltage Differential Signaling) to Minimize Performance Limitations In ADC Applications When Providing High Speed Data Output
Application Notes PDF
AN-812:  MicroController-Based Serial Port Interface (SPI) Boot Circuit (pdf, 452,449 bytes)  (pdf, 441 kB)
This application note describes the operation of a general-purpose, microcontroller-based Serial Port Interface (SPI) boot circuit.
Application Notes PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Semiconductors: The Heart of Next-Generation Medical Devices
Highly integrated chips are paving the way for smaller, more portable equipment.
(Design News, May 18, 2009)
Technical Articles HTML
The AD9271 - A Revolutionary Solution for Portable Ultrasound
(Analog Dialogue, Vol. 41, July 2007)
Technical Articles HTML
Integrated Analog Front End (AFE) Contains Eight Ultrasound Receive Channels in a Single IC Technical Articles HTML
The AD9271 - A Revolutionary Solution for Portable Ultrasound
(Analog Dialogue, Vol. 41, July 2007)
Analog Dialogue HTML
Analog Devices Creates Chip for Portable Ultrasound
(EDA Geek, 4/6/2007)
Product Reviews HTML
AFE Improves Portable-Ultrasound Image Quality
(Electronic Products, 4/2007)
Product Reviews HTML
Integrated Analog IC Could Boost Portable Ultrasound Performance
(Design News, 5/14/2007)
Product Reviews HTML
Analog Devices Enables Superior Image Quality in Portable Ultrasound Medical Diagnostics
(Analog and DSP, 4/2/2007)
Product Reviews HTML
Ultrasound Chip Supports Image Processing, Reduces Power Consumption
(EE Product Center, 4/2/2007)
Product Reviews HTML
Industry’s First Octal Ultrasound Receiver with Digital I/Q Demodulator and Decimation Filter Reduces Processor Overhead in Ultrasound Systems (23 Jul 2012) Press Releases HTML
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
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

Evaluation Kits & Symbols & Footprints

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.

SampleSample & Buy

Price, packaging, availability

AD9271 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9271BSVZ-25 Status: Production 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Tray, 90 - - Y  Material Info PCN/PDN Purchase
AD9271BSVZ-40 Status: Production 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Tray, 90 $54.12 $46.00 Y  Material Info PCN Purchase
AD9271BSVZ-50 Status: Production 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Tray, 90 $58.82 $50.00 Y  Material Info PCN Purchase
AD9271BSVZRL-25 Status: Last Time Buy 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Reel, 1000 - - Y  Material Info PCN/PDN Purchase
AD9271BSVZRL-40 Status: Production 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Reel, 1000 - $46.00 Y  Material Info PCN Purchase
AD9271BSVZRL-50 Status: Last Time Buy 100 ld TQFP w/ 9.5mm exposed pad 100 Ind Reel, 1000 - - Y  Material Info PCN/PDN 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.


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