Monolithic op amp with rail-to-rail output swing and low input bias current

Photocoupler

Since the 1960s, monolithic operational amplifiers have been a cornerstone in analog electronics. Over time, these devices have continuously evolved, delivering better performance and more features. The LTC6090 is a prime example of this progress, offering exceptional performance with an extended supply voltage range of ±70V. Despite this high-voltage capability, it maintains all the key characteristics expected from a precision op amp, such as low noise, high accuracy, and stability.

The LTC6090 is available in two compact package options: an 8-pin SOIC and a 16-lead TSSOP. Both packages include exposed thermal pads to improve heat dissipation, reducing the need for external heat sinks. This makes it ideal for applications where space is limited but high reliability is essential. Additionally, its simple interface with low-voltage control lines and built-in thermal protection make it easier to integrate into complex high-voltage designs.

High Voltage, High Performance

When it comes to operational amplifiers, key specifications like low input bias current, low offset voltage, and low noise are critical. The LTC6090 excels in all these areas. It features a MOS input stage that delivers typically 3 pA of input bias current at 25°C and less than 100 pA at 85°C. This makes it especially suitable for high-impedance applications, such as photodiode amplifiers, where even the smallest leakage currents can impact performance.

The device also offers a very low input offset voltage of less than 1.6 mV and a noise level of just 11 nV/√Hz at 10 kHz. Its common-mode input range extends up to 3V or as far as 134V from either rail, making it highly versatile across a wide supply range of up to 140V. This wide dynamic range allows the LTC6090 to operate effectively in both low and high-voltage environments without compromising performance.

Figure 1: Extended Dynamic Range 1M Transimpedance Photodiode Amplifier

For more detailed information on the LTC6090 and its capabilities, you can refer to the full technical document titled “Monolithic op amps with rail-to-rail output swing and low input bias current.” This resource provides in-depth insights into the design, application, and performance of this advanced op amp.