Features and Benefits
- Fixed gain of 2000
- Access to internal nodes provides flexibility
- Low noise: 1.5 nV/√Hz input voltage noise
- High accuracy dc performance
Gain drift: 10 ppm/°C
Offset drift: 1 μV/°C
Gain accuracy: 0.2%
CMRR: 130 dB min
- Excellent ac specifications
Bandwidth: 3.5 MHz
Slew rate: 40 V/μs
- Power supply range:
±4 V to ±18 V
- 8-pin SOIC package
- ESD protection >5000 V (HBM)
- Temperature range for specified performance:
−40°C to +85°C
- Operational up to 125°C
- Download AD8428-KGD Data Sheet
- Available As Known Good Die and fully guaranteed to data sheet specifications
The AD8428 is an ultra-low noise instrumentation amplifier designed for accurately measuring tiny, high-speed signals. It delivers industry-leading gain-accuracy, noise and bandwidth.
All gain setting resistors for the AD8428 are internal to the part and precisely matched. Care is taken in both interconnects and symmetry. This results in excellent gain drift and quick settling to the final gain value after the part is powered on.
The high CMRR of the AD8428 prevents unwanted signals from corrupting the acquisition. The part’s pin-out is designed to avoid parasitic capacitance mismatches that can degrade CMRR at high frequencies.
The AD8428 is one of the fastest instrumentation amplifiers available. The circuit architecture is designed for high bandwidth at high gain: it uses current feedback topology for the initial pre-amp gain stage of 200, followed by a difference amplifier stage of 10. This results in a 3.5 MHz bandwidth at a gain of 2000, for an equivalent gain-bandwidth product of 7 GHz.
The AD8428 pinout allows access to internal nodes between the first and second stage. This feature can be useful to modify DC and AC parameters between the two amplification stages.
The AD8428 performance is specified over the industrial temperature range of −40°C to +85°C. It is available in an 8-lead plastic SOIC package.
- Sensor interface
- Medical instrumentation
- Patient monitoring
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)
Analog Devices provides a line of evaluation boards designed to help users evaluate our instrumentation amplifiers in 8 pin packages. Access the user guide UG-261.
This user guide describes three generic evaluation boards that can be used to evaluate many of Analog Devices instrumentation amplifiers. For information on the performance of a specific instrumentation amplifier, see the data sheet for that instrumentation amplifier.
- 3 generic, easy-to-use evaluation boards
- Shipped with an assortment of Analog Devices in-amps
- Solder in the in-amp to be tested
- Test pins already populated
- Decoupling capacitors already populated
- EVAL-INAMP-62RZ board: Compatible with AD620, AD621, AD622, AD623, AD627, AD8223, AD8225, LT1167, LT1168 and LT6370 in SOIC or PDIP
- EVAL-INAMP-82RZ board: Compatible with AD8221, AD8226, AD8227, AD8228, AD8229, AD8421, AD8428, and AD8429 in SOIC package
- EVAL-INAMP-82RMZ board: Compatible with AD8220, AD8221, AD8226, AD8227, AD8228, AD8236, and AD8421 in MSOP package
Documentation & Resources
This Noise Will Keep You Up at Night2/1/2017
No Pain High Gain: Building a Low-Noise Instrumentation Amplifier with Nanovolt Sensitivity5/1/2015 Analog Dialogue
Tools & Simulations
In-Amp Diamond Plot Tool
The Diamond Plot Tool is a web application that generates a configuration-specific Output Voltage Range vs. Input Common-Mode Voltage graph, also known as the Diamond Plot, for Analog Devices Instrumentation Amplifiers. Based on user inputs such as supply voltage, gain, and input signal range, the tool detects saturation and recommends in-amps for which the input signal is in-range and the configuration is valid. Avoid saturation, find the best in-amp for your design, and save time.
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.
Sample & Buy
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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.