Interfacing the DS1859 Digitally Controlled Resistors to the MAX3735 Laser Driver

Description: This article describes three options for interfacing the DS1859 to the MAX3735. It includes a new technique using an operational amplifier that provides a linear transfer function, which can be adjusted for any arbitrary current range. All of these techniques can be applied.

The interfacing of the DS1859, a precision current sense amplifier, with the MAX3735, a high-speed comparator, can be achieved through various methods. The first option may involve direct voltage level shifting, where the output of the DS1859 is connected to the input of the MAX3735. This method is straightforward but may require careful consideration of the voltage thresholds to ensure proper functionality.

The second option could utilize a resistor divider network to scale the output voltage from the DS1859 to the appropriate input range of the MAX3735. This approach allows for flexibility in adjusting the voltage levels but may introduce inaccuracies due to resistor tolerances and temperature coefficients.

The third option, which is the highlighted method in this article, employs an operational amplifier (op-amp) to create a linear transfer function. This configuration enables the output of the DS1859 to be amplified or attenuated, depending on the desired current range. The op-amp can be set up in a non-inverting configuration, allowing for gain adjustments through feedback resistors. This method provides a high degree of accuracy and flexibility, making it suitable for applications requiring precise current measurements.

In summary, the interfacing of the DS1859 with the MAX3735 can be accomplished through various techniques, including direct connections, resistor dividers, and the more advanced op-amp method, which offers enhanced performance and adaptability for different current ranges. Each method has its advantages and considerations, and the choice will depend on the specific requirements of the application.This article describes three options for interfacing the DS1859 to the MAX3735. Itincludes a new technique using an opamp that gives a linear transfer function that can be adjusted for any arbitrary current range. All of these techniques can be appl..