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AD9235:  12-Bit, 20/40/65 MSPS, 3 V Analog-to-Digital Converter

Product Details


The AD9235 is a family of monolithic, single 3 V supply, 12-bit, 20/40/65 MSPS analog-to-digital converters. This family features a high performance sample-and-hold amplifier (SHA) and voltage reference. The AD9235 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 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. Combined with power and cost savings over previously available analog-to-digital converters, the AD9235 is suitable for applications in communications, imaging, and medical ultrasound.

A single-ended clock input is used to control all internal conversion cycles. A duty cycle stabilizer (DCS) compensates for wide variations in the clock duty cycle while maintaining excellent overall ADC performance. The digital output data is presented in straight binary or twos complement formats. An out-of-range (OTR) signal indicates an overflow condition that can be used with the most significant bit to determine low or high overflow.

Fabricated on an advanced CMOS process, the AD9235 is available in a 28-lead thin shrink small outline package (TSSOP) and a 32-lead chip scale package (LFCSP) and is specified over the industrial temperature range (-40°C to +85°C).

FEATURES and BENEFITS

  • Single +3 V Supply Operation (2.7 V to 3.6 V)
  • SNR = 70 dBc to Nyquist at 65 MSPS
  • SFDR = 85 dBc to Nyquist at 65 MSPS
  • Low Power: 300 mW at 65 MSPS
  • On-Chip Reference and SHA
  • Differential Input with 500 MHz Bandwidth
  • DNL of ±0.4 LSB
  • Flexible Analog Input: 1 V p-p to 2 V p-p
  • Offset Binary or Twos Complement Data Format
  • Clock Duty Cycle Stabilizer
  • Pin out Migration to Either AD9215, AD9236, AD9245

Functional Block Diagram for AD9235

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
AD9235: 12-Bit, 20/40/65 MSPS 3 V A/D Converter Data Sheet (Rev D, 10/2012) (pdf, 1328 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
UG-173: High Speed ADC USB FIFO Evaluation Kit (HSC-ADC-EVALB-DCZ)  (pdf, 774 kB) User Guides PDF
Ask The Application Engineer 36, Wideband A/D Converter Front-End Design Considerations II: Amplifier-or Transformer Drive for the ADC?
(Analog Dialogue, Volume 41 February 2007)
Analog Dialogue HTML
Which ADC Architecture Is Right for Your Application?
by Walt Kester, Analog Devices, Inc. (Analog Dialogue, Vol 39, June 2005)
Analog Dialogue HTML
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 System Considerations and their Impact on Front-End Components  (pdf)
(Analog Dialogue, Vol 36, No. 3)
Analog Dialogue PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
by Brad Brannon (RF Design, 6/1/2003)
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
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
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD9235 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 AD9235
  • 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 AD9235 Recommended External Reference for the AD9235
  • For improved thermal drift and gain accuracy, we recommend the ADR130.
Recommended Power Solutions

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Price, packaging, availability

AD9235 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9235BCPZ-20 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $8.34 $7.08 Y  Material Info PCN Purchase
AD9235BCPZ-40 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $9.41 $7.99 Y  Material Info PCN Purchase
AD9235BCPZ-65 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Tray, 490 $14.29 $12.14 Y  Material Info PCN Purchase
AD9235BCPZRL7-20 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $7.08 Y  Material Info PCN Purchase
AD9235BCPZRL7-40 Status: Production 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $7.99 Y  Material Info PCN Purchase
AD9235BCPZRL7-65 Status: Last Time Buy 32 ld LFCSP (5x5mm CP-32-2) 32 Ind Reel, 1500 - $12.14 Y  Material Info PCN/PDN Purchase
AD9235BRUZ-20 Status: Production 28 ld TSSOP 28 Ind Tube, 50 $8.34 $7.08 Y  Material Info PCN Purchase
AD9235BRUZ-40 Status: Production 28 ld TSSOP 28 Ind Tube, 50 $9.41 $7.99 Y  Material Info PCN Purchase
AD9235BRUZ-65 Status: Production 28 ld TSSOP 28 Ind Tube, 50 $14.29 $12.14 Y  Material Info PCN Purchase Sample
AD9235BRUZRL7-20 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $7.08 Y  Material Info PCN Purchase
AD9235BRUZRL7-40 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $7.99 Y  Material Info PCN Purchase
AD9235BRUZRL7-65 Status: Production 28 ld TSSOP 28 Ind Reel, 1000 - $12.14 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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