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AD9268:  16-Bit, 125 MSPS/105 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter

Product Details


The AD9268 is a dual, 16-bit, 80 MSPS/105 MSPS/125 MSPS analog-to-digital converter (ADC). The AD9268 is designed to support communications applications where high performance, combined with low cost, small size, and versatility, is desired.

The dual ADC core features a multistage, differential pipelined architecture with integrated output error correction logic. Each ADC features wide bandwidth, differential sample-and-hold analog input amplifiers that support a variety of user-selectable input ranges. An integrated voltage reference eases design considerations. A duty cycle stabilizer is provided to compensate for variations in the ADC clock duty cycle, allowing the converters to maintain excellent performance.

The ADC output data can be routed directly to the two external 16-bit output ports. These outputs can be set to either 1.8 V CMOS or LVDS.

Flexible power-down options allow significant power savings, when desired.

Programming for setup and control is accomplished using a 3-wire SPI-compatible serial interface.

The AD9268 is available in a 64-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C.

Product Highlights

  1. On-chip dither option for improved SFDR performance with low power analog input.
  2. Proprietary differential input that maintains excellent SNR performance for input frequencies up to 300 MHz.
  3. Operation from a single 1.8 V supply and a separate digital output driver supply accommodating 1.8 V CMOS or LVDS outputs.
  4. Standard serial port interface (SPI) that supports various product features and functions, such as data formatting (offset binary, twos complement, or gray coding), enabling the clock DCS, power-down, test modes, and voltage reference mode.
  5. Pin compatibility with the AD9258, allowing a simple migration from 16 bits to 14 bits. The AD9268 is also pin compatible with the AD9251, AD9231, and AD9204 family of products for lower sample rate, low power applications.

Applications

  • Communications
  • Diversity radio systems
  • Multimode digital receivers (3G)
      GSM, EDGE, W-CDMA, LTE,
      CDMA2000, WiMAX, TD-SCDMA
  • I/Q demodulation systems
  • Smart antenna systems
  • General-purpose software radios
  • Broadband data applications
  • Ultrasound equipment

FEATURES and BENEFITS

  • SNR = 78.2 dBFS @ 70 MHz and 125 MSPS
  • SFDR = 88 dBc @ 70 MHz and 125 MSPS
  • Low power: 750 mW @ 125 MSPS
  • 1.8 V analog supply operation
  • 1.8 V CMOS or LVDS output supply
  • Integer 1-to-8 input clock divider
  • IF sampling frequencies to 300 MHz
  • −153.6 dBm/Hz small-signal input noise with 200 Ω input impedance @ 70 MHz and 125 MSPS
  • Optional on-chip dither
  • Programmable internal ADC voltage reference
  • See data sheet for additional features

AD9268 Functional Block Diagram

Documentation

Title Content Type File Type
AD9268: 16-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC) Data Sheet (Rev A, 09/2009) (pdf, 1092 kB) Data Sheets PDF
AN-1211: Powering the AD9268 Dual Channel 16-Bit, 125 MSPS Analog-to-Digital Converter with the ADP2114 Synchronous Step-Down DC-to-DC Regulator for Increased Efficiency  (pdf, 153 kB) Application Notes 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-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-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 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-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
AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
CN-0171  (pdf, 158 kB)
Low Noise, Low Distortion Single-Ended Input Drive Circuit for Differential Input IF Sampling ADCs
Circuit Note PDF
UG-003: Evaluating the AD9650/AD9268/AD9258/AD9251/AD9231/AD9204 Analog-to-Digital Converters  (pdf, 2699 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Improve The Design Of Your Passive Wideband ADC Front-End Network
As converter technology improves, so does the demand to resolve very high intermediate frequencies (IFs) accurately at high speeds. This poses two challenges: the converter design itself and the front-end design that couples the signal content to the converter. Even if the converter itself is excellent, the front end must be able to preserve the signal quality too.
(Electronic Design, 3/26/2010)
Technical Articles HTML
Test & Instrumentation Solutions Bulletin, Volume 10, Issue 3  (pdf, 1334 kB) Solutions Bulletins 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
AD9268 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.

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Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD9268

  • For differential RF/IF, we recommend the ADL5561 or the ultra low distortion ADL5562.
  • For single ended input drive, we recommend the ADL5535 or the ADL5536.
Recommended VGA's for the AD9268
  • For an independent, dual channel, digitally controlled VGA, we suggest the AD8372.
  • For an ultralow distortion, IF dual channel VGA, we recommend the AD8376.
Recommended Clock Drivers for the AD9268
  • For low jitter performance and integrated VCO, we recommend the AD9520-0 or the AD9522-0.
Recommended Power Supply for the AD9268
  • For powering the individual supply rails, we recommend the ADP2114, low noise, dual switching regulator.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD9268 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9268BCPZ-105 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Tray, 260 $140.00 $119.00 Y  Material Info Notify Me Purchase
AD9268BCPZ-125 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Tray, 260 $160.00 $136.00 Y  Material Info Notify Me Purchase
AD9268BCPZ-80 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Tray, 260 $118.82 $101.00 Y  Material Info Notify Me Purchase
AD9268BCPZRL7-105 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Reel, 750 - - Y  Material Info Notify Me Purchase
AD9268BCPZRL7-125 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Reel, 750 $160.00 $136.00 Y  Material Info Notify Me Purchase
AD9268BCPZRL7-80 Status: Production 64 ld LFCSP (9x9mm, 7.5mm exposed pad) 64 Ind Reel, 750 $118.82 $101.00 Y  Material Info Notify Me 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.

AD9268 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9268-105EBZ Status: Production Evaluation Board $200.00 Yes -
AD9268-125EBZ Status: Production Evaluation Board $200.00 Yes -
AD9268-80EBZ Status: Production Evaluation Board $200.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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