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AD7949:  14-Bit, 8-Channel, 250 kSPS PulSAR ADC

Product Details


The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD.

The AD7949 contains all components for use in a multichannel, low power data acquisition system, including a true 14-bit SAR ADC with no missing codes; an 8-channel, low crosstalk multiplexer that is useful for configuring the inputs as single-ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order.

The AD7949 uses a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.

The AD7949 is housed in a tiny 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications
  • Multichannel system monitoring
  • Battery-powered equipment
  • Medical instruments: ECG/EKG
  • Mobile communications: GPS
  • Personal digital assistants
  • Power line monitoring
  • Data acquisition
  • Seismic data acquisition systems
  • Instrumentation
  • Process control

FEATURES and BENEFITS

  • 14-bit resolution with no missing codes
  • 8-channel multiplexer with choice of inputs:
    Unipolar single ended
    Differential (GND sense)
    Pseudobipolar
  • Throughput: 250 kSPS
  • INL/DNL: ±0.5/±0.25 LSB typical
  • Analog input range: 0 V to VREF with VREF up to VDD
  • Multiple reference types
    Internal selectable 2.5 V or 4.096 V
    External buffered (up to 4.096 V)
    External (up to VDD)
  • Internal temperature sensor (TEMP)
  • See Data sheet for additional features

AD7949-EP: Supports defense and aerospace applications (AQEC standard)

  • Download AD7949-EP Data Sheet
  • Military temperature range
    (−55°C to +125°C)
  • Controlled manufacturing baseline
  • Enhanced product change notification
  • Qualification data available on request
  • V62/12645 DSCC Drawing Number

Functional Block Diagram for AD7949

Documentation

Title Content Type File Type
AD7949: 14-Bit, 8-Channel, 250 kSPS PulSAR ADC Data Sheet (Rev D, 03/2012) (pdf, 256 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
EVAL-AD76MUXEDZ: Evaluation Board For AD7682/89/99/7949 PulSAR® ADCs (Preliminary, Rev. PrD)  (pdf, 4664 kB) User Guides PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles 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 AD7949

Recommended External References for the AD7949

  • For precision, low noise, high accuracy, we recommend the ADR433 or ADR445 reference family.
  • For a reference buffer amplifier, we recommend the AD8031 or the AD8605.
Recommended Power Solutions for the AD7949
  • For input voltages up to 5.5V we would recommend the ADM7160.
  • For input voltages up to 20V we would recommend the ADP7118.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7949 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7949BCPZ Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Tray, 490 $4.46 $4.04 Y  Material Info PCN Purchase Sample
AD7949BCPZRL7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 1500 - $4.04 Y  Material Info PCN Purchase
AD7949SCPZ-EP-RL7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 1500 - $8.08 Y  Material Info PCN Purchase Sample
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.

AD7949 Evaluation Kit
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7949EDZ Status: Production Evaluation Board $59.00 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.

Check Inventory & Purchase

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