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AD8428
RECOMMENDED FOR NEW DESIGNSLow Noise, Low Gain Drift, G = 2000 Instrumentation Amplifier
- Part Models
- 4
- 1ku List Price
- Starting From $7.77
Part Details
- 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.
Applications
- Sensor interface
- Medical instrumentation
- Patient monitoring
Documentation
Data Sheet 2
Application Note 1
Technical Book 1
Analog Dialogue 1
Rarely Asked Question Page 1
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 |
|---|---|---|---|
| AD8428ARZ | 8-Lead SOIC | ||
| AD8428ARZ-RL | 8-Lead SOIC | ||
| AD8428BRZ | 8-Lead SOIC | ||
| AD8428BRZ-RL | 8-Lead SOIC |
This is the most up-to-date revision of the Data Sheet.
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.
Open ToolSPICE Model 1
Signal Chain Designer - BETA
Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.
Open ToolEvaluation Kits
AD62x, AD822x, AD842x Series InAmp Evaluation Board