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.
|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|
|AN-1026: High Speed Differential ADC Driver Design Considerations (pdf, 355 kB)||Application Notes|
|CN-0237: Ultralow Power, 18-Bit, Differential PulSAR ADC Driver (pdf, 463 kB)||Circuit Note|
|MT-218: Multiple Feedback Band-Pass Design Example (pdf, 0)||Tutorials|
|UG-474: Evaluation Board for Differential Amplifiers Offered in 8-Lead SOIC Packages (PDF, 263 kB)||User Guides|
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
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|
|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|
|Title||Content Type||File Type|
|ADA4940 SPICE Macro Model||SPICE Models||HTML|
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.