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.
|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|
|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|
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.
|AN-932: Power Supply Sequencing (pdf, 95 kB)||Application Notes|
|AN-877: Interfacing to High Speed ADCs via SPI (pdf, 1594 kB)||Application Notes|
|AN-935: Designing an ADC Transformer-Coupled Front End (pdf, 363 kB)||Application Notes|
|AN-742: Frequency Domain Response of Switched-Capacitor ADCs (pdf, 401 kB)||Application Notes|
|MT-031: Grounding Data Converters and Solving the Mystery of (pdf, 144 kB)||Tutorials|
|MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design (pdf, 152 kB)||Tutorials|
|MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB," and Why You Should Care (pdf, 94 kB)||Tutorials|
|UG-609: Evaluating the AD7903 Dual Differential, 16-Bit, 1 MSPS PulSAR ADC (pdf, 2092 kB)||User Guides|
|MS-2210: Designing Power Supplies for High Speed ADC (pdf, 327 kB)||Technical Articles|
|MS-2022: Seven Steps to Successful Analog-to-Digital Signal Conversion (Noise Calculation for Proper Signal Conditioning) (pdf, 277 kB)||Technical Articles|
|MS-2124: Understanding AC Behaviors of High Speed ADCs (pdf, 276 kB)||Technical Articles|
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.
|High Performance Electrocardiogram (ECG) Signal Conditioning||Technical Articles||HTML|
Voltage Reference Design for Precision Successive-Approximation ADCs
(Analog Dialogue, Volume 47 – June 2013)
|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|
Low-Power Data Conversion Technology Enhances Portability
Lowest-Power 16-Bit ADC Optimizes Portable Designs
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
|AD7903 IBIS Model (ibs)||IBIS Models||IBS|
Recommended Driver Amplifiers for the AD7903
Recommended External Voltage References for the AD7903
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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.