ADA4950-1
Low Power Selectable Gain Differential ADC Driver, G = 1, 2, 3
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Overview
Features and Benefits
- High performance at low power
- High speed
-3 dB bandwidth of 750 MHz, G = 1
0.1 dB flatness to 210 MHz, VOUT, dm = 2 V p-p, RL, dm = 200 Ω
Slew rate: 2900 V/µs, 25% to 75%
Fast 0.1% settling time of 9 ns - Low power: 9.5 mA per amplifier
- Low harmonic distortion
108 dB SFDR @ 10 MHz
98 dB SFDR @ 20 MHz - Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
- ±0.2 mV typical input offset voltage
- Selectable differential gains of 1, 2, and 3
- Differential-to-differential or single-ended-to-differential operation
- Adjustable output common-mode voltage
- Input common-mode range shifted down by one VBE
- Wide supply range: +3 V to ±5 V
- Available in 16-lead and 24-lead LFCSP packages
Product Details
The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors with on-chip feedback and gain resistors. It is an ideal choice for driving high performance ADCs as a single-ended-to-differential or differential-to-differential amplifier. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4950-x output to match the input of the ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.Differential gain configurations of 1, 2, and 3 are easily realized with internal feedback networks that are connected externally to set the closed-loop gain of the amplifier.
The ADA4950-1/ADA4950-2 are fabricated using the Analog Devices, Inc., proprietary silicon-germanium (SiGe) complementary bipolar process, enabling them to achieve low levels of distortion and noise at low power consumption. The low offset and excellent dynamic performance of the ADA4950-x make it well suited for a wide variety of data acquisition and signal processing applications.
The ADA4950-x is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP (ADA4950-1, single) or a Pb-free 4 mm × 4 mm, 24-lead LFCSP (ADA4950-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4950-1/ADA4950-2 are specified to operate over the -40°C to +105°C temperature range; both operate on supplies from +3 V to ±5 V.
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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 Systems2/14/2015
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AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications (Rev. 0)2/14/2015
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AN-0992: Active Filter Evaluation Board for Differential Amplifiers (Rev. 0)2/14/2015
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AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev. B)2/14/2015
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AN-1026: High Speed Differential ADC Driver Design Considerations (Rev. A)2/14/2015
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AN-584: Using the AD813X Differential Amplifier (Rev. 0)10/14/2002
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Open-Source LIDAR Prototyping Platform2/1/2020 Analog Dialogue
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Versatile, Precision Single-Ended-to-Differential Signal Conversion Circuit with Adjustable Output Common Mode Boosts System Dynamic Range11/1/2015 Analog Dialogue
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Measuring Noise of Low-Fixed-Gain Differential Amplifiers7/1/2009 Analog Dialogue
Tools & Simulations
SPICE Models
CIR
ADA4950 SPICE Macro Model
4.26 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 |
|---|---|---|---|---|
| ADA4950-1YCPZ-R7 | Material Declaration | Reliability Data | 16-Lead LFCSP (3mm x 3mm w/ EP) | |
| ADA4950-1YCPZ-RL | Material Declaration | Reliability Data | 16-Lead LFCSP (3mm x 3mm w/ EP) | |
| Wafer Fabrication Data |
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ADA4950-1 Discussions
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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.