AD7903:  Dual Differential 16-Bit, 1 MSPS PulSAR 12.0 mW in QSOP

Product Details

Product Status:Recommended for New Designs

The AD7903 is a dual 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial interface port. On the CNVx rising edge, the AD7903 samples the voltage difference between the INx+ and INx− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput.

Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies.

The AD7903 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C.

APPLICATIONS

  • Battery-powered equipment
  • Communications
  • Automated test equipment (ATE)
  • Data acquisition
  • Medical instrumentation
  • Redundant measurement
  • Simultaneous sampling

FEATURES and BENEFITS

  • 16-bit resolution with no missing codes
  • Throughput: 1 MSPS
  • Low power dissipation
    7.0 mW at 1 MSPS (VDD1 and VDD2 only)
    12.0 mW at 1 MSPS (total)
    140 µW at 10 kSPS
  • INL: ±0.5 LSB typical, ±2.0 LSB maximum
  • True differential analog input range: ±VREF
    0 V to VREF with VREF between 2.4 V to 5.1 V
    Allows use of any input range
    Easy to drive with the ADA4941-1
  • SINAD: 93.5 dB at 1 kHz
  • THD: −112 dB at 1 kHz
  • 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
  • 20-lead QSOP package
  • Wide operating temperature range: −40°C to +125°C

Functional Block Diagram for AD7903

Documentation

Title Content Type File Type
AD7903: Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP Data Sheet (Rev A, 01/2014) (pdf, 870 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
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
UG-609: Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC  (pdf, 2092 kB) User Guides PDF
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
High Performance Electrocardiogram (ECG) Signal Conditioning Technical Articles HTML
Voltage Reference Design for Precision Successive-Approximation ADCs
(Analog Dialogue, Volume 47 – June 2013)
Analog Dialogue HTML
Analog Devices Releases Two Dual A/D Converters with Lowest Power/Highest Linearity Combination Available (19 Jun 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
Low-Power Data Conversion Technology Enhances Portability
(Electropages, 10/5/2006)
Product Reviews HTML
Lowest-Power 16-Bit ADC Optimizes Portable Designs
(eeProductCenter, 10/4/2006)
Product Reviews HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7903 IBIS Model  (ibs) IBIS Models IBS

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 AD7903

Recommended External Voltage References for the AD7903

  • For a low noise, high accuracy 2.5V reference, we recommend the ADR431 or the ADR4525.
  • For a low noise, high accuracy 3V reference, we suggest the ADR433 or the ADR4533.
  • For a low noise, high accuracy 5V reference, we recommend the ADR435 or the ADR4550.
  • For driving the voltage reference input, we recommend the AD8031 or the AD8605 buffer amplifiers.
Recommended Digital Isolators for the AD7903
  • 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

AD7903 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7903BRQZ Status: Production 20 ld QSOP 20 Ind Tube, 56 $18.30 $15.00 Y  Material Info Notify Me Purchase Sample
AD7903BRQZ-RL7 Status: Production 20 ld QSOP 20 Ind Reel, 1000 - $15.00 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.

AD7903 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7903SDZ Status: Production Evaluation Board $99.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller 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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