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ADA4940-1:  Ultralow Power, Low Distortion ADC Driver

Product Details

Product Status:Recommended for New Designs

The ADA4940-1/ADA4940-2 are low noise, low distortion differential amplifiers with very low power consumption. They are an ideal choice for driving low power, high resolution, high performance SAR and sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with resolutions up to 18 bits from dc to 1 MHz on only 1.25 mA of quiescent current. The adjustable level of the output common-mode voltage allows the ADA4940-1/ ADA4940-2 to match the input common-mode voltage of multiple ADCs. The internal common-mode feedback loop provides exceptional output balance, as well as suppression of even-order harmonic distortion products.

With the ADA4940-1/ADA4940-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier. The ADA4940-1/ADA4940-2 are fabricated using Analog Devices, Inc., complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 3.9 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4940-1/ADA4940-2 make them well suited for a variety of data acquisition and signal processing applications.

The ADA4940-1 is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP. The ADA4940-2 is available in a Pb-free, 4 mm × 4 mm, 24-lead LFCSP. The pinout is optimized to facilitate printed circuit board (PCB) layout and minimize distortion. The ADA4940-1/ADA4940-2 are specified to operate over the −40°C to +125°C temperature range.

Applications

  • Low power ADC drivers
  • Single-ended-to-differential converters
  • Differential buffers
  • Line drivers
  • Medical Imaging
  • Industrial Process Control
  • Portable Electronics

FEATURES and BENEFITS

  • Small signal bandwidth:
    260 MHz
  • Extremely low harmonic distortion
    −122 dB THD at 50 kHz
    −96 dB THD at 1 MHz
  • Low input voltage noise:
    3.9 nV/√Hz
  • Very low power consumption: 6.25 mW (5 V supply)
  • 0.35 mV maximum offset voltage
  • Externally adjustable gain
  • Differential-to-differential or single-to-differential operation
  • Balanced outputs
  • Settling time to 0.1%: 34 ns
  • Output voltage swing from −VS + 0.1 V to +VS − 0.1 V
  • Adjustable output common-mode voltage
  • Flexible power supplies:
    3 V to 7 V

Pin Configuration for ADA4940-1 (LFCSP)


ADA4940-1 Pin Configuration (SOIC)

ADA4940-1 Pin Configuration (SOIC)

Measured Performance of ADA4940-1 Driving
the AD7982 ADC

Measure Performance ADA4940-1 Driving the AD7982 ADC

Documentation

Title Content Type File Type
ADA4940-1/ADA4940-2: Ultralow Power, Low Distortion ADC Driver Data Sheet (Rev C, 09/2013) (pdf, 149 kB) Data Sheets PDF
AN-1026: High Speed Differential ADC Driver Design Considerations  (pdf, 355 kB) Application Notes PDF
CN-0237: Ultralow Power, 18-Bit, Differential PulSAR ADC Driver  (pdf, 463 kB) Circuit Note PDF
MT-218: Multiple Feedback Band-Pass Design Example  (pdf, 0) Tutorials PDF
UG-474: Evaluation Board for Differential Amplifiers Offered in 8-Lead SOIC Packages  (PDF, 263 kB) User Guides PDF
UG-132: Evaluation Board User Guide for the ADA492x-1 and ADA493x-1 Family of Differential Amplifiers  (pdf, 226 kB)
Differential Amplifier Evaluation Board for Single 16-lead 3 mm × 3 mm LFCSP Packages
User Guides PDF
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
Peak High-speed Performance even at low power. It's why more engineers choose ADI Data Converters. Solutions Bulletins HTML
Analog-to-Digital Converter and Driver ICs Solutions Bulletins HTML
Data Converter ICs Solutions Bulletin, Volume 10, Issue 7 Solutions Bulletins HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADA4940 SPICE Macro Model SPICE Models 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

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Price, packaging, availability

ADA4940-1 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4940-1ACPZ-R2 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 250 $2.36 $2.36 Y  Material Info PCN Purchase
ADA4940-1ACPZ-R7 Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 1500 $1.91 $1.59 Y  Material Info PCN Purchase Sample
ADA4940-1ACPZ-RL Status: Production 16 ld LFCSP (3x3mm, 1.3mm exposed pad) 16 Ind Reel, 5000 $1.91 $1.59 Y  Material Info PCN Purchase
ADA4940-1ARZ Status: Production 8 ld SOIC 8 Tube, 98 $1.91 $1.59 Y  Material Info Notify Me Purchase Sample
ADA4940-1ARZ-R7 Status: Production 8 ld SOIC 8 Reel, 1000 - $1.59 Y  Material Info Notify Me Purchase
ADA4940-1ARZ-RL Status: Production 8 ld SOIC 8 Reel, 2500 - $1.59 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.

ADA4940-1 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4940-1ACP-EBZ Status: Production 16-Lead LFCSP Bare Evaluation Board $18.25 Yes -
ADA4940-1ACPZ-R7 Status: Production 16-Lead LFCSP - 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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