SGM8955XN5G/TR 1.8V, Micro-Power CMOS Zero-Drift Operational Amplifiers

Product Overview

The SGM8955XN5G/TR is a high-precision, low-noise, and low-power operational amplifier designed by SGMICRO for use in a variety of applications, such as industrial control systems, audio equipment, and instrumentation. The AD8538AUJZ from Analog Devices is also a precision op-amp, designed for similar applications but with some differences in performance characteristics. This comparison aims to underline the advantages of the SGMICRO solution in terms of accuracy, power consumption, noise performance, and overall value.

Input Offset Voltage

The SGM8955XN5G/TR features an ultra-low input offset voltage of 25 µV (max), ensuring superior precision in applications requiring high accuracy. The AD8538AUJZ provides an input offset voltage of 50 µV (max), which is higher than that of the SGMICRO product. The lower offset voltage in the SGM8955XN5G/TR results in significantly improved accuracy, making it a better choice for high-precision applications such as medical equipment, audio systems, and sensor interfaces where even small deviations could lead to significant errors.

Input Bias Current

The SGM8955XN5G/TR offers an excellent input bias current of 1 pA (max), which is lower than the AD8538AUJZ's 2 pA (max). Lower input bias current is particularly advantageous in precision circuits where the input impedance is high, as it minimizes the potential for errors caused by the bias current. The SGMICRO device’s superior input bias current ensures high accuracy in applications such as low-level signal amplification and high-impedance sensor interfaces.

Voltage Noise Density

The SGM8955XN5G/TR exhibits a low voltage noise density of 1.0 nV/√Hz at 1 kHz, which contributes to a better signal-to-noise ratio (SNR) in noise-sensitive applications. The AD8538AUJZ has a higher noise density of 1.2 nV/√Hz at 1 kHz. The lower noise density in the SGMICRO product makes it an ideal choice for high-precision measurement systems, audio equipment, and sensitive industrial electronics where reducing noise is critical for maintaining performance and reliability.

Power Supply Rejection Ratio (PSRR)

The SGM8955XN5G/TR offers a PSRR of 120 dB, which is excellent for rejecting power supply fluctuations and ensuring stable operation in noisy environments. In comparison, the AD8538AUJZ provides a PSRR of 110 dB. The SGMICRO amplifier’s higher PSRR results in better immunity to power supply noise, which is crucial in battery-powered systems, automotive electronics, and portable devices where a clean and stable power supply is necessary to maintain operational integrity.

Low Power Consumption

One of the standout features of the SGM8955XN5G/TR is its low quiescent current of 0.6 mA, which ensures lower power consumption without sacrificing performance. In comparison, the AD8538AUJZ requires a higher quiescent current of 1.2 mA. The SGMICRO op-amp's lower quiescent current provides better power efficiency, making it more suitable for battery-operated applications, portable electronics, and low-power systems where minimizing power consumption is a key design consideration.

Temperature Stability

The SGM8955XN5G/TR offers excellent temperature stability, with an input offset voltage drift of 0.3 µV/°C. The AD8538AUJZ, on the other hand, has a higher offset voltage drift of 0.5 µV/°C. The SGMICRO amplifier’s superior temperature stability ensures that the performance remains consistent even in fluctuating environmental conditions, making it a more reliable choice for automotive, aerospace, and industrial applications where temperature variations are common.

Package and Size

The SGM8955XN5G/TR comes in a compact SOT-23-5 package, which is ideal for designs that require a small footprint and limited space. The AD8538AUJZ is available in an 8-lead SOIC package, which is larger and may not be as suitable for space-constrained applications. The smaller form factor of the SGMICRO product allows for greater flexibility in compact designs, miniaturized devices, and applications where space is at a premium.

Cost-Effectiveness

The SGM8955XN5G/TR is highly cost-effective, providing excellent performance at a more competitive price compared to the AD8538AUJZ. This makes the SGMICRO op-amp a more attractive option for high-volume applications, consumer electronics, and cost-sensitive projects. The balance of performance, reliability, and price makes the SGM8955XN5G/TR a stronger value proposition.

Conclusion

The SGM8955XN5G/TR from SGMICRO offers a range of advantages over the AD8538AUJZ from Analog Devices. These include a lower input offset voltage, better voltage noise density, higher PSRR, lower quiescent current, superior temperature stability, and a more compact package. With a more competitive price, the SGMICRO op-amp is a better choice for high-precision, low-power, and space-constrained applications. Whether used in consumer electronics, automotive systems, sensor interfaces, or precision instrumentation, the SGM8955XN5G/TR provides enhanced performance, reliability, and value.