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ADA4930-2:  Ultralow Noise Drivers for Low Voltage ADCs

Product Details

Product Status:Recommended for New Designs

The ADA4930-1/ADA4930-2 are very low noise, low distortion, high speed differential amplifiers. They are an ideal choice for driving 1.8 V high performance ADCs with resolutions up to 14 bits from dc to 70 MHz. The adjustable output common mode allows the ADA4930-1/ADA4930-2 to match the input of the ADC. The internal common-mode feedback loop provides exceptional output balance, suppression of even-order harmonic distortion products, and dc level translation.

With the ADA4930-1/ADA4930-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier.

The ADA4930-1/ADA4930-2 are fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 1.2 nV/√Hz.

The low dc offset and excellent dynamic performance of the ADA4930-1/ADA4930-2 make them well suited for a wide variety of data acquisition and signal processing applications. The ADA4930-1 is available in a Pb-free, 3 mm × 3 mm 16-lead LFCSP, and the ADA4930-2 is available in a Pb-free, 4 mm × 4 mm 24-lead LFCSP. The pinout has been optimized to facilitate printed circuit board (PCB) layout and minimize distortion. The ADA4930-1 is specified to operate over the −40°C to +105°C temperature range, and the ADA4930-2 is specified to operate over the −40°C to +105°C temperature range for 3.3 V or 5 V supply voltages.


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

FEATURES and BENEFITS

  • Low input voltage noise: 1.2 nV/√Hz
  • Low common-mode output: 0.9 V on single supply
  • Extremely low harmonic distortion
    −104 dBc HD2 at 10 MHz
    −79 dBc HD2 at 70 MHz
    −73 dBc HD2 at 100 MHz
    −101 dBc HD3 at 10 MHz
    −82 dBc HD3 at 70 MHz
    −75 dBc HD3 at 100 MHz
  • High speed
    −3 dB bandwidth of 1.35 GHz, G = 1
    Slew rate: 3400 V/μs, 25% to 75%
    0.1 dB gain flatness to 380 MHz
    Fast overdrive recovery of 1.5 ns
  • 0.5 mV typical offset voltage
  • Externally adjustable gain
  • Differential-to-differential or single-ended-to-differential operation
  • See data sheet for additional features

Functional Block Diagrams

Documentation

Title Content Type File Type
ADA4930-1/ADA4930-2: Ultralow Noise Drivers for Low Voltage ADCs Data Sheet (Rev A, 10/2010) (pdf, 662 kB) Data Sheets PDF
AN-1026: High Speed Differential ADC Driver Design Considerations  (pdf, 355 kB) Application Notes PDF
AN-0992: Active Filter Evaluation Board for Differential Amplifiers  (pdf, 85 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
ADA4930: Single Supply Low Noise ADC Driver
Analog Devices showcases the first Single-Supply ADC Driver that is capable of driving 40 MSPS to 200 MSPS, 1.8V, 14 Bit analog to digital converters.
Videos HTML
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
Designing 1-ppm DAC Accuracy into Instrumentation Applications
Understand the challenges of achieving this level of converter performance
(Planet Analog, 3/2010)
  • Part 1
    This article looks at a 1-ppm DAC and associated support circuitry, error sources, and performance measures.
  • Part 2
    This article discusses 1-ppm circuit complexities including noise, temperature drift, thermoelectric voltages, physical stress, long-term stability, circuit construction and layout, and voltage references.
Technical Articles HTML
"Rules of the Road" for High-Speed Differential ADC Drivers
(Analog Dialogue, Vol. 43, No. 5, 2009)
Analog Dialogue HTML
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
ADA4930 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

ADA4930-2 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4930-2YCPZ-R2 Status: Production 24 ld LFCSP (4x5mm w/2.34mm EP) 24 Ind Reel, 250 $9.02 $9.02 Y  Material Info PCN Purchase
ADA4930-2YCPZ-R7 Status: Production 24 ld LFCSP (4x5mm w/2.34mm EP) 24 Ind Reel, 1500 $7.21 $6.29 Y  Material Info PCN Purchase Sample
ADA4930-2YCPZ-RL Status: Production 24 ld LFCSP (4x5mm w/2.34mm 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.

ADA4930-2 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADA4930-2YCP-EBZ Status: Production 24-Lead LFCSP Bare Evaluation Board $18.25 Yes -
ADA4930-2YCPZ-R7 Status: Production 24-Lead LFCSP $9.04 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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