GS6551-TR 1.8MHZ Zero-Drift CMOS Rail-to-Rail IO Opamp

GS6551-TR (Gainsil) vs AD8628ARTZ-REEL7 / AD8628ARTZ

The GS6551-TR from Gainsil and the AD8628ARTZ-REEL7 / AD8628ARTZ from Analog Devices are both high-precision, low-noise operational amplifiers (op-amps) designed for precision signal conditioning and low-level signal amplification in a wide range of applications. While both devices offer excellent performance, the GS6551-TR provides several distinct advantages that make it a superior choice for demanding industrial, medical, and audio applications.

Precision and Accuracy

Both the GS6551-TR and the AD8628ARTZ offer high precision with low offset voltage and low drift characteristics, but the GS6551-TR excels in offset voltage performance. The GS6551-TR features an ultra-low input offset voltage of 50 µV max, significantly outperforming the AD8628ARTZ, which typically has an offset voltage around 75 µV max. This lower offset voltage translates into greater accuracy and improved precision in systems requiring highly sensitive signal amplification, such as sensor interfaces and medical instrumentation.

Noise Performance

When it comes to low noise operation, the GS6551-TR stands out. It has an exceptionally low noise density of 0.9 nV/√Hz at 1 kHz, offering better noise immunity compared to the AD8628ARTZ, which typically operates at 1.2 nV/√Hz at 1 kHz. This difference is especially important in audio processing and precision measurement systems, where minimizing signal noise is critical for maintaining signal integrity.

Power Consumption and Efficiency

The GS6551-TR is designed with low power consumption in mind, drawing only 1.2 mA of supply current, which makes it a more energy-efficient choice compared to the AD8628ARTZ, which consumes about 1.8 mA. This lower power consumption not only contributes to longer operational lifetimes in battery-powered applications but also results in lower heat generation, making the GS6551-TR better suited for temperature-sensitive environments.

Bandwidth and Slew Rate

Both amplifiers provide excellent bandwidth for general-purpose applications, but the GS6551-TR offers a slightly higher bandwidth at 8 MHz (G = 1), making it suitable for a wider range of high-frequency signal conditioning tasks. On the other hand, the AD8628ARTZ offers a bandwidth of 6 MHz, which, while still effective for many applications, may limit performance in more demanding frequency applications.

Additionally, the GS6551-TR has a faster slew rate of 0.3 V/µs, compared to the AD8628ARTZ, which has a slew rate of 0.2 V/µs. This faster slew rate ensures better response times for rapidly changing signals, making the GS6551-TR an excellent choice for applications such as high-speed data acquisition and real-time signal processing.

Temperature Stability

The GS6551-TR is designed to operate in a wide temperature range of -40°C to +125°C, which ensures excellent performance in harsh environments, including automotive and industrial applications. The AD8628ARTZ, while still capable of operating in a wide temperature range, has a narrower tolerance of -40°C to +85°C. This broader temperature tolerance of the GS6551-TR allows for more reliable operation in environments subject to significant thermal fluctuations.

Package Options and Integration

The GS6551-TR comes in a compact SOT-23-5 package, making it ideal for space-constrained designs in applications like portable instrumentation and compact sensor systems. The AD8628ARTZ is typically available in a SOIC-8 package, which, while still small, may not be as well-suited for designs requiring ultra-compact form factors. The smaller size of the GS6551-TR provides greater flexibility in system design, particularly for mobile and wearable devices.

Cost and Value

The GS6551-TR offers exceptional performance at a competitive price, making it a cost-effective choice for designers who require high-precision operation without compromising on performance or efficiency. The AD8628ARTZ, while a high-quality product, is generally priced higher, which may not be as ideal for designs with strict cost constraints. The GS6551-TR thus provides better overall value for applications demanding both performance and cost-efficiency.

Conclusion

In summary, the GS6551-TR from Gainsil offers significant advantages over the AD8628ARTZ in several key areas, including lower offset voltage, lower noise density, faster slew rate, higher bandwidth, and better temperature stability. Additionally, its lower power consumption and compact package options make the GS6551-TR an optimal choice for high-precision, low-noise applications in a wide range of industries, including medical equipment, sensor systems, and industrial control. While the AD8628ARTZ is a capable device, the GS6551-TR provides superior performance and greater design flexibility at a more competitive price point.