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AD7944:  14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP

Product Details


The AD7944 is a 14-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 14-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7944 samples an analog input, IN+, between 0 V and VREF with respect to a ground sense, IN−. The AD7944 features a very high sampling rate turbo mode (TURBO high) and a reduced power normal mode (TURBO low) for low power applications where the power is scaled with the throughput. In normal mode (TURBO low), the SPI-compatible serial inter- face also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provide an optional busy indicator. The serial interface is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.

The AD7944 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications
  • Battery-powered equipment
  • Communications
  • ATE
  • Data acquisition systems
  • Medical instruments

FEATURES and BENEFITS

  • 14-bit resolution with no missing codes
  • Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
  • Low power dissipation
    15.5 mW at 2.5 MSPS, with external reference
    28 mW at 2.5 MSPS, with internal reference
  • INL: ±0.25 LSB typical, ±1.0 LSB maximum
  • SNR
    84 dB, with on-chip reference
    84.5 dB, with external reference
  • 4.096 V internal reference: typical drift of ±10 ppm/°C
  • Pseudo differential analog input voltage range
    0 V to VREF with VREF up to 5.0 V
    Allows use of any input range
  • No pipeline delay
  • Logic interface: 1.8 V/2.5 V/2.7 V
  • Serial interface: SPI-/QSPI-/MICROWIRE-/DSP-compatible
  • Ability to daisy-chain multiple ADCs with busy indicator
  • 20-lead, 4 mm × 4 mm LFCSP (QFN)

Functions Block Diagram for AD7944

Documentation

Title Content Type File Type
AD7944: 14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP Data Sheet (Rev B, 07/2014) (pdf, 576 kB) Data Sheets 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 AD7944
  • For low noise, low power single-to-differential driver amplifier, we recommend the ADA4941-1.
  • For low noise, small size and low power, we recommend the ADA4841-1.
  • For a fully differential attenuating precision amplifier, we recommend the AD8475.
  • For 5V single supply and low noise, we recommend the AD8655.
Recommended External References for the AD7944
  • 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 selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

AD7944 Model Options
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.

AD7944 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD7944EBZ Status: Production Evaluation Board $59.00 Yes -
EVAL-CED1Z Status: Production Evaluation 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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