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AD7988-1:  16-Bit, 100ksps, Ultra Low Power 16-Bit SAR ADC

Product Details

Product Status:Recommended for New Designs

The AD7988-1/AD7988-5 are 16-bit, successive approximation, analog-to-digital converters (ADC) that operate from a single power supply, VDD. The AD7988-1 offers a 100 kSPS throughput, and the AD7988-5 offers a 500 kSPS throughput. They are low power, 16-bit sampling ADCs with a versatile serial interface port. On the CNV rising edge, they sample an analog input, IN+, between 0 V to VREF with respect to a ground sense, IN−. 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 to daisy-chain several ADCs on a single 3-wire bus using the SDI input. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using the separate supply, VIO.

The AD7988-1/AD7988-5 generics are housed in a 10-lead MSOP or a 10-lead LFCSP (QFN) with operation specified from −40°C to +125°C.

Applications
  • Battery-powered equipment
  • Low power data acquisition systems
  • Portable medical instruments
  • ATE equipment
  • Data acquisitions
  • Communications

FEATURES and BENEFITS

  • Low power dissipation
    AD7988-1
    400 μW at 100 kSPS (VDD only)
    700 μW at 100 kSPS (total)

    AD7988-5
    2 mW at 500 kSPS (VDD only)
    3.5 mW at 500 kSPS (total)
  • 16-bit resolution with no missing codes
  • Throughput: 100 kSPS/500 kSPS options
  • INL: ±0.6 LSB typical, ±1.25 LSB maximum
  • SINAD: 91.5 dB at 10 kHz
  • THD: −114 dB at 10 kHz
  • Pseudo differential analog input range
    0 V to VREF with VREF from 2.5 V to 5.5 V
    Any input range and easy to drive with the ADA4841-1
  • 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
  • Daisy-chain multiple ADCs
  • 10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP (QFN), same space as SOT-23
  • Wide operating temperature range: −40°C to +125°C

Functional Block Diagram for AD7988-1

Similar Products

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

Documentation

Title Content Type File Type
AD7988-1/AD7988-5: 16-Bit Lower Power PulSAR ADCs in MSOP/LFCSP Data Sheet (Rev E, 08/2014) (pdf, 583 kB) Data Sheets 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-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
CN-0255: A Complete Single-Supply, 16-Bit, 100 kSPS PulSAR ADC System Dissipates 8 mW  (pdf, 325 kB) Circuit Note PDF
CN-0306: A 16-Bit, 100 kSPS Low Power Successive Approximation ADC System with Optimum Low Power Drive Amplifier for Sub-Nyquist Input Signals Up to 1 kHz  (pdf, 306 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
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
Voltage Reference Design for Precision Successive-Approximation ADCs
(Analog Dialogue, Volume 47 – June 2013)
Analog Dialogue HTML
Most Power Efficient Drivers For 12-, 14- And 16-bit A/D Converters Unveiled (23 Sep 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
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7988-1 IBIS Models IBIS Models HTML
BeMicro FPGA Project for AD7988-1 with Nios driver FPGA HDL HTML
AD7988-1 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 AD7988

Recommended External Voltage References for the AD7988
  • For low noise, high accuracy, low drift, we recommend the ADR435 or the ADR4550 family of precision references.
  • For a low impedance reference buffer amplifier, we recommend the AD8031 or the AD8605.

Recommended Digital Isolators for the AD7988

  • 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 the AD7988
  • For a low noise positive LDO, For 5V systems we recommend the ADM7160, for 12V systems the ADP7118 and 24V systems the ADP7142.
  • For a low noise negative LDO, for 5V, 12V and 24V systems we recommend the ADP7182.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7988-1 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7988-1BCPZ-RL Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 5000 - $6.50 Y  Material Info PCN Purchase
AD7988-1BCPZ-RL7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $6.50 Y  Material Info PCN Purchase Sample
AD7988-1BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $9.28 $6.50 Y  Material Info Notify Me Purchase Sample
AD7988-1BRMZ-RL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $6.50 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.

AD7988-5 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7988-5-PMDZ Status: Production Evaluation Board PMOD compatible form factor $27.00 Yes -
EVAL-AD7988-5SDZ Status: Production Evaluation Board SDP Interface $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board SDP $99.00 Yes -
SDP-PMD-IB1Z Status: Production Evaluation Interposer Board PMOD to SDP w/ Power Supply $55.00 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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