Overview
The AD8428BRZ, produced by Analog Devices Inc., is an ultralow noise instrumentation amplifier designed to accurately measure tiny, high-speed signals. It delivers industry-leading gain accuracy, noise, and bandwidth, making it ideal for applications requiring precise signal measurement. The AD8428 features internal, precisely matched gain setting resistors, which ensure excellent gain drift and quick settling to the final gain value after power-on. The amplifier's architecture includes a current feedback topology for the initial preamplifier gain stage followed by a difference amplifier stage, resulting in a high bandwidth of 3.5 MHz at a gain of 2000.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Noise | 1.5 | nV/√Hz | ||
| Gain Drift | 5 | ppm/°C | ||
| Offset Drift | 0.3 | μV/°C | ||
| Gain Accuracy | 0.05% | % | ||
| CMRR | 140 | dB | ||
| Bandwidth | 3.5 | MHz | ||
| Slew Rate | 40 | V/μs | ||
| Power Supply Range | ±4 | ±18 | V | |
| Quiescent Current | 6.5 | 8 | mA | |
| Temperature Range | -40 | 85 | °C | |
| Package | 8-lead SOIC | |||
| ESD Protection | 5000 V (HBM) |
Key Features
- Ultralow noise: 1.5 nV/√Hz input voltage noise
- High accuracy dc performance with gain accuracy of 0.05% and offset drift of 0.3 μV/°C
- Excellent ac specifications including a bandwidth of 3.5 MHz and a slew rate of 40 V/μs
- High CMRR of 140 dB to prevent unwanted signals from corrupting the signal of interest
- Fixed gain of 2000 with internal, precisely matched gain setting resistors
- Access to internal nodes for modifying the frequency response between the two amplification stages
- Power supply range of ±4 V to ±18 V and operational temperature range of -40°C to +85°C
- ESD protection greater than 5000 V (HBM)
Applications
- Sensor interface
- Medical instrumentation
- Patient monitoring
Q & A
- What is the input voltage noise of the AD8428BRZ?
The input voltage noise of the AD8428BRZ is 1.5 nV/√Hz.
- What is the gain drift of the AD8428BRZ?
The gain drift of the AD8428BRZ is 5 ppm/°C.
- What is the CMRR of the AD8428BRZ?
The CMRR of the AD8428BRZ is 140 dB minimum.
- What is the bandwidth of the AD8428BRZ at a gain of 2000?
The bandwidth of the AD8428BRZ at a gain of 2000 is 3.5 MHz.
- What is the slew rate of the AD8428BRZ?
The slew rate of the AD8428BRZ is 40 V/μs.
- What is the power supply range of the AD8428BRZ?
The power supply range of the AD8428BRZ is ±4 V to ±18 V.
- What is the operational temperature range of the AD8428BRZ?
The operational temperature range of the AD8428BRZ is -40°C to +85°C.
- What type of package is the AD8428BRZ available in?
The AD8428BRZ is available in an 8-lead plastic SOIC package.
- Does the AD8428BRZ have ESD protection?
Yes, the AD8428BRZ has ESD protection greater than 5000 V (HBM).
- What are some common applications of the AD8428BRZ?
The AD8428BRZ is commonly used in sensor interfaces, medical instrumentation, and patient monitoring.
