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AD9238:  Dual 12-Bit, 20/40/65 MSPS, 3 V ADC

Product Details


The AD9238 is a dual, 3 V, 12-bit, 20/40/65 MSPS analog to digital converter. It features dual high performance sample-and-hold amplifiers and an integrated voltage reference. The AD9238 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy and guarantee no missing codes over the full operating temperature range at up to 65 MSPS data rates.

The wide bandwidth, differential SHA allows for a variety of user-selectable input ranges and offsets including single-ended applications. It is suitable for various applications including multiplexed systems that switch full-scale voltage levels in successive channels and for sampling inputs at frequencies well beyond the Nyquist rate. The AD9238 is suitable for applications in communications, imaging and medical ultrasound.

Dual single-ended independent clock inputs are used to control all internal conversion cycles. A Duty Cycle Stabilizer (DCS) is available on the AD9238-65 and can compensate for wide variations in the clock duty cycle, allowing the converters to maintain excellent performance. The digital output data is presented in either straight binary or twos complement format. Out-of-range signals indicate 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 AD9238 is available in either a space saving 64-pin LQFP or 64-pin LF-CSP and is specified over the industrial temperature range (-40°C to +85°C).

Applications

  • Ultrasound equipment
  • Direct conversion or IF sampling receivers
    WB-CDMA, CDMA2000, WiMAX
  • Battery-powered instruments
  • Hand-held scopemeters
  • Low cost, digital oscilloscopes

FEATURES and BENEFITS

  • Integrated Dual 12-Bit Analog-to-Digital Converters
  • Single 3 V Supply Operation (2.7 V to 3.6 V)
  • SNR = 70 dBc (to Nyquist, AD9238-65)
  • SFDR = 80.5 dBc (to Nyquist, AD9238-65)
  • Low Power: 300 mW/channel at 65 MSPS
  • Differential Input with 500 MHz 3 dB bandwidth
  • Exceptional crosstalk immunity>85 dB
  • Flexible Analog Input: 1 Vp-p to 2 Vp-p Range
  • Offset Binary or Twos Complement Data Format
  • Clock Duty Cycle Stabilizer
  • Output datamux option

Functional Block Diagram for AD9238

Documentation

Title Content Type File Type
AD9238: 12-Bit, 20/40/65 MSPS Dual A/D Converter Data Sheet (Rev C, 11/2010) (pdf, 1720 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-807: Multicarrier WCDMA Feasibility  (pdf, 969 kB) Application Notes PDF
AN-808: Multicarrier CDMA2000 Feasibility  (pdf, 1535 kB)
The goal of this application note is to determine the feasibility of implementing a multicarrier CDMA2000 transceiver and what the major subsystem performances must be.
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
AN-297: Test Video A/D Converters Under Dynamic Conditions  (pdf, 731 kB) Application Notes PDF
UG-173: High Speed ADC USB FIFO Evaluation Kit (HSC-ADC-EVALB-DCZ)  (pdf, 774 kB) User Guides PDF
Ultrasound System Considerations and their Impact on Front-End Components  (pdf)
(Analog Dialogue, Vol 36, No. 3)
Analog Dialogue 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
Ultrasound Analog Electronics Primer
(Analog Dialogue, Vol. 33, No. 5, May, 1999)
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
Proper Grounding Is Critical For High-Speed Systems
... by Walt Kester and James Bryant, Analog Devices, Inc. (Wireless Systems Design, May 2000)
Technical Articles HTML
DNL and Some of its Effects on Converter Performance
... by Brad Brannon, Analog Devices, Inc. (Wireless Design & Development, June 2001)
Technical Articles HTML
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
by Brad Brannon (RF Design, 6/1/2003)
Technical Articles 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
AD9238 IBIS Models IBIS Models 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 ADC Drivers for the AD9238

  • For baseband applications, we recommend the AD8138 or the ADA4932-1 differential driver.
  • For frequencies in the second Nyquist zone, we recommend the AD8352 differential driver.
Recommended Clock Drivers for the AD9238 Recommended External Reference for the AD9238
  • For improved thermal drift and gain accuracy, we recommend the ADR130.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD9238 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9238BCPZ-20 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Tray, 260 $13.11 $11.13 Y  Material Info Notify Me Purchase
AD9238BCPZ-40 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Tray, 260 $14.29 $12.14 Y  Material Info Notify Me Purchase Sample
AD9238BCPZ-65 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Tray, 260 $21.43 $18.22 Y  Material Info Notify Me Purchase
AD9238BCPZRL-20 Status: Last Time Buy 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 2500 - - Y  Material Info PDN Purchase
AD9238BCPZRL-40 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 2500 - $12.14 Y  Material Info Notify Me Purchase
AD9238BCPZRL-65 Status: Production 64 ld LFCSP (9x9mm, 4.70mm exposed pad) 64 Ind Reel, 2500 - $18.22 Y  Material Info Notify Me Purchase
AD9238BSTZ-20 Status: Production 64 ld LQFP (7x7mm) 64 Ind Tray, 250 $13.11 $11.13 Y  Material Info PCN Purchase
AD9238BSTZ-40 Status: Production 64 ld LQFP (7x7mm) 64 Ind Tray, 250 $14.29 $12.14 Y  Material Info PCN Purchase
AD9238BSTZ-65 Status: Production 64 ld LQFP (7x7mm) 64 Ind Tray, 250 $21.43 $18.22 Y  Material Info PCN Purchase
AD9238BSTZRL-20 Status: Production 64 ld LQFP (7x7mm) 64 Ind Reel, 2000 - $11.13 Y  Material Info PCN Purchase
AD9238BSTZRL-40 Status: Production 64 ld LQFP (7x7mm) 64 Ind Reel, 2000 - $12.14 Y  Material Info PCN Purchase
AD9238BSTZRL-65 Status: Production 64 ld LQFP (7x7mm) 64 Ind Reel, 2000 - $18.22 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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