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AD9237:  12-Bit, 20/40/65 MSPS 3 V Low Power A/D Converter

Product Details


The AD9237 is a monolithic, single 3 V supply, 12-bit, 20/40/65 MSPS Analog to Digital Converter with a high performance sample-and-hold amplifier and voltage reference. The AD9237 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 20/40/65 MSPS data rates and guarantee no missing codes over the full operating temperature range.

The wide bandwidth, truly differential SHA allows for a variety of user-selectable input ranges and offsets including single-ended applications. It is suitable for multiplexed systems that switch full-scale voltage levels in successive channels and for sampling single-channel inputs at frequencies well beyond the Nyquist rate. With significant power savings over previously available analog to digital converters, the AD9237 is suitable for applications imaging and medical ultrasound.

A single-ended clock input is used to control all internal conversion cycles. The digital output data is presented in straight binary, twos complement, or gray code formats. An out-of-range (OTR) signal indicates an overflow condition, which can be used with the most significant bit to determine low or high overflow.

Fabricated on an advanced CMOS process, the AD9237 is available in a 32-pin chip scale package and is specified over the industrial temperature range (-40°C to +85°C).

Product Highlights

  1. Operating at 65 MSPS, the AD9237 consumes a low 190 mW and only consumes 135 mW at 40 MSPS and 90 mW at 20 MSPS.
  2. The AD9237 operates from a single 3V power supply, and features a separate digital output driver supply to accommodate 2.5V and 3.3V logic families.
  3. The patented SHA input maintains excellent performance for input frequencies beyond Nyquist, and can be configured for single-ended or differential operation.
  4. The AD9237 is pin compatible to the AD9235, a 12-bit, 20/40/65 MSPS A/D converter. This allows a simplified path for low power 12-bit systems.
  5. The AD9237 is optimized for selectable and flexible input ranges from 4 Vp-p to 1 Vp-p.
  6. Output Enable pin to allow for multiplexing of the outputs.
  7. Two-step power down supports a standby mode in addition to a power down mode.
  8. The OTR output bit indicates when the signal is beyond the selected input range.

Applications

  • Ultrasound and Medical Imaging
  • Battery Powered Instruments
  • Hand-Held Scopemeters
  • Low Cost Digital Oscilloscopes
  • Low Power Digital Still Cameras and Copiers
  • Low power communications

FEATURES and BENEFITS

  • Ultra Low Power
    85mW@20MSPS
    135mW @ 40MSPS
    190mW @ 65MSPS
  • SNR = 66 dBc to Nyquist at 65MSPS
  • SFDR = 80 dBc to Nyquist at 65 MSPS
  • DNL= ±0.7 LSB
  • Differential input with 500 MHz bandwidth
  • Flexible analog input: 1 V p-p to 4 V p-p range
  • Offset binary, twos complement, or gray code data formats
  • Output Enable Pin
  • 2-step power down; Full Power down and Sleep mode
  • Clock duty cycle stabilizer

Functional Block Diagram for AD9237

Of Note ...

To drive this ADC in DC-coupled applications, we suggest ADA4938-1. To drive this ADC in AC-coupled applications, we suggest AD8351.

Documentation

Title Content Type File Type
AD9237: 12-Bit, 20 MSPS/40 MSPS/65 MSPS 3 V Low Power A/D Converter Data Sheet (Rev B, 07/2012) (pdf, 998 kB) Data Sheets PDF
AN-1142: Techniques for High Speed ADC PCB Layout  (pdf, 392 kB) Application Notes PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-737: How ADIsimADC Models an ADC  (pdf, 373 kB) Application Notes PDF
AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs  (pdf, 203 kB) Application Notes PDF
AN-905: VisualAnalog Converter Evaluation Tool Version 1.0 User Manual  (pdf, 2124 kB) Application Notes PDF
AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
AN-835: Understanding High Speed ADC Testing and Evaluation  (pdf, 985 kB) Application Notes PDF
AN-803: Pin Compatible High Speed ADCs Simplify Design Tasks  (pdf, 356 kB) Application Notes PDF
AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated  (pdf, 370 kB) Application Notes PDF
AN-345: Grounding for Low-and-High-Frequency Circuits  (pdf, 455 kB)
Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
Application Notes PDF
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter  (pdf, 291 kB) Application Notes PDF
AN-501: Aperture Uncertainty and ADC System Performance  (pdf, 227 kB)
A Key Concern in IF Sampling is that of Aperture Uncertainty (Jitter)
Application Notes PDF
UG-173: High Speed ADC USB FIFO Evaluation Kit (HSC-ADC-EVALB-DCZ)  (pdf, 774 kB) User Guides PDF
How Ultrasound System Considerations Influence Front-End Component Choice
There are major trade-offs to be considered when designing ultrasound front-end circuits. Performance parameters in the front-end circuit components affect diagnostic performance—and conversely, system configuration and objectives affect the choice of components.

(Analog Dialogue, Vol. 36, No. 3, May-July, 2002)
Analog Dialogue HTML
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Matching An ADC To A Transformer
by Rob Reeder, Analog Devices, Inc.
(Microwaves & RF, 7/2007)
Technical Articles HTML
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
by Brad Brannon (RF Design, 6/1/2003)
Technical Articles HTML
12-Bit A/D Converter Consumes Less Power
(eeProductCenter, 6/9/2005)
Product Reviews HTML
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
AD9237 IBIS Models IBIS Models 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

AD9237 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9237BCPZ-40 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Comm. Tray, 490 $9.44 $8.00 Y  Material Info PCN Purchase
AD9237BCPZRL7-40 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 $9.44 $8.00 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.


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