SGM80582XS8G/TR Rail-to-Rail Output CMOS Operational Amplifiers

Product Comparison: SGM80582XS8G/TR vs. ADA4891-2ARZ / ADA4891-2ARZ-R7

1. Power Efficiency and Quiescent Current
The SGM80582XS8G/TR delivers a lower quiescent current of just 1.1mA per amplifier, offering significant energy efficiency when compared to ADA4891-2ARZ, which consumes 3.5mA (typical). This means that the SGM80582XS8G/TR has more than a 68% reduction in quiescent current, making it a better choice for low-power applications, especially battery-operated devices.

2. Supply Voltage Range and Flexibility
SGMICRO's SGM80582XS8G/TR supports a wide single-supply voltage range from 2.5V to 5.5V, offering greater flexibility in various system architectures. On the other hand, the ADA4891-2ARZ operates with a supply voltage range of ±2.5V, equating to a 5V total supply. This makes the SGM80582XS8G/TR more versatile for both low-voltage and standard 5V systems, which can be a critical advantage for designers working with a variety of power requirements.

3. Slew Rate and Bandwidth
The SGM80582XS8G/TR provides a slew rate of 45V/µs and a gain-bandwidth product (GBW) of 120MHz, making it a solid choice for many high-speed applications. However, the ADA4891-2ARZ offers a slightly higher slew rate of 55V/µs and a GBW of 130MHz. Despite the slight edge in raw speed of the ADA4891-2ARZ, SGM80582XS8G/TR excels in its combination of energy efficiency and speed, giving designers a balanced option that provides high performance without sacrificing low power consumption.

4. Rail-to-Rail Output Performance
An important advantage of the SGM80582XS8G/TR is its rail-to-rail output, which allows it to drive signals close to the supply rails, maximizing the dynamic range within the constraints of the supply voltage. The ADA4891-2ARZ, while providing high performance, does not feature a rail-to-rail output, limiting its ability to fully utilize the supply voltage for maximum signal swing. For applications requiring the highest output swing, SGMICRO’s rail-to-rail design provides a distinct advantage.

5. Noise Performance
In terms of input-referred noise, the ADA4891-2ARZ offers a low noise density of 1.1nV/√Hz, which is ideal for ultra-low noise applications. The SGM80582XS8G/TR has an input-referred noise density of 3.5nV/√Hz, which, while higher, is still acceptable for most general-purpose applications where power savings and overall system performance are prioritized. The lower noise level of the ADA4891-2ARZ makes it ideal for high-precision applications, but for many practical uses, the SGM80582XS8G/TR provides a cost-effective and sufficiently low-noise alternative.

6. Package and Integration
Both the SGM80582XS8G/TR and ADA4891-2ARZ come in 8-lead packages (MSOP-8 for SGM80582XS8G/TR and SOIC-8 for ADA4891-2ARZ), ensuring compatibility for drop-in replacement and ease of integration into existing designs. This makes it easy for customers to switch between the two without requiring any changes to the PCB layout, simplifying product development and time-to-market.

7. Cost-Effectiveness and Supply Chain Stability
SGMICRO’s SGM80582XS8G/TR is priced competitively, offering excellent performance at a lower cost compared to the ADA4891-2ARZ, which is often priced higher due to its premium specifications. Additionally, SGMICRO provides consistent supply chain stability, which is crucial for customers needing long-term availability and reliable sourcing for high-volume production runs. In contrast, Analog Devices’ ADA4891-2ARZ may experience occasional supply constraints, particularly during periods of high demand, which could pose challenges in long-term project planning.

Conclusion
The SGM80582XS8G/TR from SGMICRO stands out as a highly efficient, flexible, and cost-effective operational amplifier, offering outstanding low power consumption, rail-to-rail output, and a wide supply voltage range. While the ADA4891-2ARZ excels in ultra-low noise applications and offers slightly higher performance in terms of speed and noise density, the SGM80582XS8G/TR offers an excellent trade-off between power efficiency, performance, and cost, making it a versatile solution for a wide variety of applications.