ADA4938-2
Ultralow Distortion Differential ADC Driver (Dual)
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Overview
Features and Benefits
- Extremely low harmonic distortion (HD)
- −106 dBc HD2 at 10 MHz
- −82 dBc HD2 at 50 MHz
- −109 dBc HD3 at 10 MHz
- −82 dBc HD3 at 50 MHz
- Low input voltage noise: 2.6 nV/√Hz
- High speed
- −3 dB bandwidth of 1000 MHz, G = +1
- Slew rate: 4700 V/μs
- 0.1 dB gain flatness to 150 MHz
- Fast overdrive recovery of 4 ns
- 1 mV typical offset voltage
- Externally adjustable gain
- Differential-to-differential or single-ended-to-differential operation
- Adjustable output common-mode voltage
- Wide supply voltage range: +5 V to ±5 V
- Single or dual amplifier configuration available
Product Details
The ADA4938-1 / ADA4938-2 are low noise, ultralow distortion, high speed differential amplifiers. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 27 MHz, or up to 12 bits from dc to 74 MHz. The output common-mode voltage is adjustable over a wide range, allowing the ADA4938-1/ADA4938-2 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.
Full differential and single-ended-to-differential gain configurations are easily realized with the ADA4938-1/ADA4938-2. A simple external feedback network of four resistors determines the closed-loop gain of the amplifier.
The ADA4938-1 / ADA4938-2 are fabricated using the Analog Devices, Inc., proprietary third generation, high voltage XFCB process, enabling it to achieve very low levels of distortion with an input voltage noise of only 2.6 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4938-1/ADA4938-2 makes them well-suited for a wide variety of data acquisition and signal processing applications.
The ADA4938-1 (single amplifier) is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP. The ADA4938-2 (dual amplifier) is available in a Pb-free, 4 mm × 4 mm, 24-lead LFCSP. The pinouts have been optimized to facilitate layout and minimize distortion. The devices are specified to operate over the extended industrial temperature range of −40°C to +85°C.
Applications
- ADC drivers
- Single-ended-to-differential converters
- IF and baseband gain blocks
- Differential buffers
- Line drivers
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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AN-282: Fundamentals of Sampled Data Systems2/14/2015PDF2131 kB
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AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications (Rev. 0)2/14/2015PDF181 kB
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AN-0992: Active Filter Evaluation Board for Differential Amplifiers (Rev. 0)2/14/2015PDF85 kB
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AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev. B)2/14/2015PDF115 kB
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AN-1026: High Speed Differential ADC Driver Design Considerations (Rev. A)2/14/2015PDF355 kB
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AN-584: Using the AD813X Differential Amplifier (Rev. 0)10/14/2002PDF174 kB
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MT-076: Differential Driver Analysis2/14/2015PDF95 kB
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MT-075: Differential Drivers for High Speed ADCs Overview2/14/2015PDF183 kB
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MT-218: Multiple Feedback Band-Pass Design Example2/10/2012PDF90 K
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"Rules of the Road" for High-Speed Differential ADC Drivers5/1/2009 Analog Dialogue
Tools & Simulations
SPICE Models
CIR
ADA4938 SPICE Macro Model
4.74 K
Design Tools
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.
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| ADA4938-2ACPZ-R7 | Material Declaration | Reliability Data | 24-Lead LFCSP (4mm x 4mm x 0.75mm w/ EP) | |
| ADA4938-2ACPZ-RL | Material Declaration | Reliability Data | 24-Lead LFCSP (4mm x 4mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data |
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Lead Times
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Evaluation Boards
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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.