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AD7631:  18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC

Product Details


The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7631 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from −40°C to +85°C.

Applications

  • Process controls
  • High speed data acquisition
  • Digital signal processing
  • Spectrum analysis ATE

FEATURES and BENEFITS

  • Multiple pins/software-programmable input ranges
    +5 V (10 V p-p), +10 V (20 V p-p),
    ±5 V (20 V p-p), ±10 V (40 V p-p)
  • Pins or serial SPI®-compatible input ranges/mode selection
  • Throughput: 250 kSPS
  • INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR)
  • 18-bit resolution with no missing codes
  • Dynamic range: 102.5 dB
  • SNR: 101 dB @ 2 kHz
  • THD: −112 dB @ 2 kHz
  • iCMOS® process technology
  • 5 V internal reference: typical drift 3 ppm/°C; TEMP output
  • No pipeline delay (SAR architecture)
  • Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface

Functional Block Diagram for AD7631

Documentation

Title Content Type File Type
AD7631: 18-Bit, 250 kSPS, Differential Programmable Input PulSAR® ADC Data Sheet (Rev B, 12/2012) (pdf, 907 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
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
Product Families Made for High-voltage Apps
(eeProductCenter, 10/10/2005)
Product Reviews HTML
High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
A PulSAR Family Brochure (6/2006)
Overview PDF
RAQs index Rarely Asked Questions 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 AD7631

  • For low noise, low frequency, low distortion and 12V supplies, we recommend the ADA4841-1.
  • For low noise, low frequency, ultralow distortion and +/-18V supplies, we suggest the AD8597 or the ADA4627-1.
  • For low bias current, low frequency and +/-13V supplies, we recommend the AD8610.
Recommended External Voltage References for the AD7631
  • For low drift and high current output applications, we recommend the ADR435 (5V) reference.
  • For low drift and low noise applications, we recommend the ADR445 (5V) reference.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7631 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7631BCPZ Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Tray, 260 $32.97 $29.80 Y  Material Info PCN Purchase Sample
AD7631BCPZRL Status: Production 48 ld LFCSP 7x7mm (5.25EP) 48 Ind Reel, 2500 - $29.80 Y  Material Info Notify Me Purchase
AD7631BSTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $32.97 $29.80 Y  Material Info PCN Purchase Sample
AD7631BSTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $29.80 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.

AD7631 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7631EDZ Status: Production Evaluation Board $150.00 Yes -
EVAL-CED1Z Status: Production Evaluation Controller Board $249.00 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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