ADA4938-1
Ultralow Distortion Differential ADC Driver (Single)
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Features
- 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
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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
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ADA4938-1
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Application Note 6
AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev.B)
AN-584: Using the AD813X Differential Amplifier (Rev.0)
AN-282: Fundamentals of Sampled Data Systems
AN-0992: Active Filter Evaluation Board for Differential Amplifiers
AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications
AN-1026: High Speed Differential ADC Driver Design Considerations
Tutorial 3
Product Selection Guide 1
Rarely Asked Question Page 1
Analog Dialogue 2
Webcast 2
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
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| ADA4938-1ACPZ-R7 |
16-Lead LFCSP (3mm x 3mm w/ EP)
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| ADA4938-1ACPZ-RL |
16-Lead LFCSP (3mm x 3mm w/ EP)
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- ADA4938-1ACPZ-R7
- Pin/Package Drawing
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16-Lead LFCSP (3mm x 3mm w/ EP)
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
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Ultra Librarian
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SamacSys
- ADA4938-1ACPZ-RL
- Pin/Package Drawing
-
16-Lead LFCSP (3mm x 3mm w/ EP)
- Documentation
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
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SamacSys
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Product Lifecycle
PCN
Feb 13, 2014
- 14_0038
Conversion of 3x3mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.
ADA4938-1ACPZ-R7
PRODUCTION
ADA4938-1ACPZ-RL
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Feb 13, 2014
- 14_0038
Conversion of 3x3mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.
ADA4938-1ACPZ-R7
PRODUCTION
ADA4938-1ACPZ-RL
PRODUCTION
Software & Part Ecosystem
Evaluation Kits 1
EVAL-FDA-1
Universal Evaluation Board for Single Differential Amplifiers
Product Detail
Resources
200.15 K
382.52 K
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