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ADA4927-2:  Ultralow Distortion Current Feedback Differential ADC Driver

Product Details


The ADA4927 is a low noise, ultralow distortion, high speed, current feedback differential amplifier that is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The output common-mode level can easily be matched to the required ADC input common-mode levels. The internal common-mode feedback loop provides exceptional output balance and suppression of even-order distortion products.

Differential gain configurations are easily realized using an external feedback network comprising four resistors. The current feedback architecture provides loop gain that is nearly independent of closed-loop gain, achieving wide bandwidth, low distortion, and low noise at higher gains and lower power consumption than comparable voltage feedback amplifiers.

The ADA4927 is fabricated using the Analog Devices, Inc., silicon-germanium complementary bipolar process, enabling very low levels of distortion with an input voltage noise of only 1.3 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4927 make it well suited for a wide variety of data acquisition and signal processing applications.

The ADA4927-1 is available in a Pb-free, 3 mm × 3 mm 16-lead LFCSP, and the ADA4927-2 is available in a Pb-free, 4 mm × 4 mm 24-lead LFCSP. The pinouts are optimized to facilitate printed circuit board (PCB) layout and to minimize distortion. They are specified to operate over the −40°C to +105°C temperature range.

Applications

  • ADC drivers
  • Single-ended-to-differential converters
  • IF and baseband gain blocks
  • Differential buffers
  • Differential line drivers

FEATURES and BENEFITS

  • Extremely low harmonic distortion
    −105 dBc HD2 @ 10 MHz
    −91 dBc HD2 @ 70 MHz
    −87 dBc HD2 @ 100 MHz
    −103 dBc HD3 @ 10 MHz
    −98 dBc HD3 @ 70 MHz
    −89 dBc HD3 @ 100 MHz
  • Better distortion at higher gains than VF amplifiers
  • Low input voltage noise: 1.4 nV/√Hz
  • High speed
    −3 dB large signal bandwidth of 2.3 GHz
    0.1 dB gain flatness: 150 MHz
    Slew rate: 5000 V/µs, 25% to 75%
    Fast 0.1% settling time: 10 ns
  • Low input offset voltage: 0.3 mV typical
  • Externally adjustable gain
  • Stability and bandwidth controlled by feedback resistor
  • See data sheet for additional Features

Functional Block Diagram for ADA4927-2

Documentation

Title Content Type File Type
ADA4927-1/ADA4927-2: Ultralow Distortion Current Feedback Differential ADC Driver Data Sheet (Rev A, 08/2009) (pdf, 828 kB) Data Sheets PDF
AN-1026: High Speed Differential ADC Driver Design Considerations  (pdf, 355 kB) Application Notes PDF
AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications  (pdf, 181 kB) Application Notes PDF
AN-0992: Active Filter Evaluation Board for Differential Amplifiers  (pdf, 85 kB) Application Notes PDF
AN-282: Fundamentals of Sampled Data Systems  (pdf, 2131 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-584: Using the AD813X Differential Amplifier  (pdf, 174 kB)
The AD813x differs from conventional op amps by the external presence of an additional input and output. The additional input, VOGM, controls the output common mode voltage.
Application Notes PDF
AN-589: Ways to Optimize the Performance of a Difference Amplifier  (pdf, 115 kB)
This Application Note presents several ways to build and optimize the performance of a discrete difference amplifier. It also recommends amplifiers that will make the overall solution cost/performance competitive with monolithic instrument amplifiers.
Application Notes PDF
MT-218: Multiple Feedback Band-Pass Design Example  (pdf, 0) Tutorials PDF
MT-076: Differential Driver Analysis  (pdf, 95 kB) Tutorials PDF
MT-075: Differential Drivers for High Speed ADCs Overview  (pdf, 183 kB) Tutorials PDF
A Stress-Free Method for Choosing High-Speed Op Amps
A decision-tree approach to making the critical decision about high-speed op amp selection, including a look at some helpful tools.
Webcasts WEBCAST
UG-018: Evaluation Board for Dual High Speed Differential Amplifiers  (pdf, 314 kB) User Guides PDF
"Rules of the Road" for High-Speed Differential ADC Drivers
(Analog Dialogue, Vol. 43, No. 5, 2009)
Analog Dialogue HTML
Analog Devices’ Dual 14-bit A/D Converter Reduces Power and Size in Communications, Instrumentation, Test and Measurement Applications (10 Jul 2012) Press Releases HTML
RF Source Booklet  (PDF, 4353 kB)
RF IC Product Overview - Version P (02/2014)
Overview PDF
ADC Drivers Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI DiffAmpCalc™
ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.
ADIsim Design/Simulation Tools HTML
ADA4927 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.

SampleSample & Buy

Price, packaging, availability

ADA4927-2 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4927-2YCPZ-R2 Status: Production 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 250 $7.81 $7.81 Y  Material Info PCN Purchase
ADA4927-2YCPZ-R7 Status: Production 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 1500 - $6.29 Y  Material Info PCN Purchase Sample
ADA4927-2YCPZ-RL Status: Production 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind Reel, 5000 - $6.29 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.

ADA4927-2 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4927-2YCP-EBZ Status: Production 24-Lead LFCSP Bare Evaluation Board $18.25 Yes -
ADA4927-2YCPZ-R7 Status: Production 24-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.

Check Inventory & Purchase

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