AD7989-5:  18-Bit, 500 kSPS PulSAR ADCs in MSOP/LFCSP

Product Details

Product Status:Recommended for New Designs

The AD7989-1/AD7989-5 are 18-bit, successive approximation, analog-to-digital converters (ADC) that operate from a single power supply, VDD. They contain a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7989-1/AD7989-5 sample the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C.

APPLICATIONS

  • Battery-powered equipment
  • Data acquisition systems
  • Medical instruments
  • Seismic data acquisition systems

FEATURES and BENEFITS

  • Low power dissipation
    2 mW at 500 kSPS (VDD only)
    3.5 mW at 500 kSPS (total)
  • 18-bit resolution with no missing codes
    Throughput: 500 kSPS
  • INL: ±1 LSB typical,
    ±2 LSB maximum
  • SNR: 98 dB at 1 kHz
    (VREF = 5 V)
  • SINAD: 97 dB at 1 kHz
  • THD: −120 dB at 10 kHz
  • Dynamic range: 99 dB
  • True differential analog input range: ±VREF
    0 V to VREF with VREF between
    2.4 V and 5.1 V
    Allows use of any input range
    Easy to drive with the ADA4941-1
  • No pipeline delay
  • Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • SPI-/QSPI™-/MICROWIRE™-/DSP-compatible serial interface
  • Ability to daisy-chain multiple ADCs
  • 10-lead package: MSOP and 3 mm × 3 mm LFCSP

Functional Block Diagram for AD7989-5

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High Resolution - Single Channel Unipolar/Bipolar 14/16/18-Bit PulSAR ADCs

Documentation

Title Content Type File Type
AD7989-1/AD7989-5: 18-Bit, 100 kSPS/500 kSPS PulSAR ADCs in MSOP/LFCSP Data Sheet (Rev A, 07/2014) (pdf, 514 kB) Data Sheets PDF
Tested ADC Driver to PulSAR ADC Application Notes HTML
AN-1141: Powering a Dual Supply Precision ADC with Switching Regulators  (pdf, 640 kB) Application Notes PDF
AN-931: Understanding PulSAR ADC Support Circuitry  (pdf, 299 kB)
This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them.
Application Notes PDF
AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
AN-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 kB) Application Notes PDF
AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
CN-0237: Ultralow Power, 18-Bit, Differential PulSAR ADC Driver  (pdf, 463 kB) Circuit Note PDF
CN-0180: Precision Single-Supply Differential ADC Driver for Industrial-Level Signals  (pdf, 388 kB) Circuit Note PDF
CN-0032: Converting a Single-Ended Signal with the AD7982 Differential PulSAR ADC  (pdf, 99 kB) Circuit Note PDF
The Data Conversion Handbook Design Handbooks HTML
MT-031: Grounding Data Converters and Solving the Mystery of  (pdf, 144 kB) Tutorials PDF
MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design  (pdf, 152 kB) Tutorials PDF
MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB," and Why You Should Care  (pdf, 94 kB) Tutorials PDF
MT-074: Differential Drivers for Precision ADCs  (pdf, 249 kB) Tutorials PDF
UG-682: 6-Lead SOT-23 ADC Driver for the 8-/10-Lead Family of 14-/16-/18-Bit PulSAR ADC Evaluation Boards  (pdf, 433 kB) User Guides PDF
Voltage Reference Design for Precision Successive-Approximation ADCs
(Analog Dialogue, Volume 47 – June 2013)
Analog Dialogue HTML
Front-End Amplifier and RC Filter Design for a Precision SAR Analog-to-Digital Converter Technical Articles HTML
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
MS-2022: Seven Steps to Successful Analog-to-Digital Signal Conversion (Noise Calculation for Proper Signal Conditioning)  (pdf, 277 kB) Technical Articles PDF
MS-2124: Understanding AC Behaviors of High Speed ADCs  (pdf, 276 kB) Technical Articles PDF
Nine Often Overlooked ADC Specifications  (pdf, 445 kB)
Analog-to-digital converters (ADCs) have many specifications; some are more important for a given application than others. Understanding these specifications and controlling external devices affecting the ADC will lead to better performance.
Technical Articles PDF
Released Today: Industry’s Lowest Power 18-bit SAR A/D Converters (06 Mar 2014) Press Releases HTML
SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
Product Selection Guide PDF
Analog Devices Sets New Standard
(EFY Times, 11/14/2006)
Product Reviews HTML
Glossary of EE Terms Glossary 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 Driver Amplifiers for the AD7989-5

Recommended External Voltage References for the AD7989-5
  • For low drift, low noise and high current output applications, we recommend the ADR435 reference family.
  • For low drift, low noise and low dropout, we recommend the ADR445 reference family.
  • For low drift, low noise, low power, we recommend the ADR4550 reference family.
  • For driving the voltage reference input, we recommend the AD8031 or the AD8655 buffer amplifiers.

Recommended Digital Isolators for the AD7989-5

  • For SPI Interface, lowest power, 2.5 kVrms isolation, we recommend the ADuM1401.
  • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation, we recommend the ADuM3401.
  • For SPI Interface, low power, 5.0 kVrms isolation, we recommend the ADuM4401.
  • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V), we recommend the ADuM3481.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7989-5 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7989-5BCPZ-R2 Status: Production LFCSP:LEADFRM CHIP SCALE 10 Ind Reel, 250 $14.58 $11.95 Y  Material Info PCN Purchase
AD7989-5BCPZ-RL7 Status: Production LFCSP:LEADFRM CHIP SCALE 10 Ind Reel, 1500 - $11.95 Y  Material Info PCN Purchase
AD7989-5BRMZ Status: Production MICRO SOIC 10 Ind Tube, 50 $14.58 $11.95 Y  Material Info Notify Me Purchase Sample
AD7989-5BRMZ-RL7 Status: Production MICRO SOIC 10 Ind Reel, 1000 - $11.95 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.

AD7989-1/AD7989-5 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7989-5SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Board $99.00 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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