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AD7984:  18-Bit, 1.33 MSPS PulSAR 10.5 mW ADC in MSOP/QFN

Product Details


The AD7984 is an 18-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7984 samples 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.

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

The AD7984 is available in a 10-lead MSOP or a 10-lead QFN (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

  • 18-bit resolution with no missing codes
  • Throughput: 1.33 MSPS
  • Low power dissipation: 10.5 mW at 1.33 MSPS
  • INL: ±2.25 LSB maximum
  • Dynamic range: 99.7 dB typical
  • True differential analog input range: ±VREF 0 V to VREF
    with VREF between 2.9 V to 5.0 V
    Allows use of any input range
    Easy to drive with the ADA4941
  • No pipeline delay
  • Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • Serial interface SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Ability to daisy-chain multiple ADCs and busy indicator
  • 10-lead MSOP (MSOP-8 size) and 10-lead 3 mm × 3 mm QFN (LFCSP), SOT-23 size

Application Diagram for AD7984

Similar Products

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

Of Note ...

Similar products include:
16-bit, 1 MSPS    AD7980
18-bit, 1 MSPS    AD7982
16-bit, 2.5 MSPS AD7985
18-bit, 2 MSPS    AD7986

Documentation

Title Content Type File Type
AD7984: 18-Bit, 1.33 MSPS PulSAR 10.5 mW ADC in MSOP/LFCSP Data Sheet (Rev B, 07/2014) (pdf, 707 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
CN0269: 18-Bit, 1.33 MSPS, 16-Channel Data Acquisition System  (pdf, 1177 kB) Circuit Note PDF
CN-0033: Converting a Single-Ended Signal with the AD7984 Differential PulSAR ADC  (pdf, 98 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
UG-340: Evaluation Board for the 10-Lead Family 14-/16-/18-Bit PulSAR ADCs  (pdf, 4636 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
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
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7984 IBIS Model IBIS Models HTML
BeMicro FPGA Project for AD7984 with Nios driver FPGA HDL HTML
AD7984 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL 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

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Companion Products

Suggested Companion Products


Recommended Driver Amplifiers for the AD7984 Recommended External Voltage References for the AD7984
  • 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 AD7984

  • 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

AD7984 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7984BCPZ-R2 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 250 - - Y  Material Info PCN Contact ADI
AD7984BCPZ-RL Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 5000 - $28.29 Y  Material Info PCN Purchase
AD7984BCPZ-RL7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $28.29 Y  Material Info PCN Purchase Sample
AD7984BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $31.29 $28.29 Y  Material Info PCN Purchase Sample
AD7984BRMZ-RL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $28.29 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.

AD7984 Evaluation kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7984-PMDZ Status: Production Evaluation Board PMOD compatible form factor $27.00 Yes -
SDP-PMD-IB1Z Status: Production Evaluation Interposer Board PMOD to SDP w/ Power Supply $55.00 Yes -
EVAL-AD7984SDZ Status: Production Evaluation Board SDP Interface $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board SDP $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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