MAX9921AUB/V+

The MAX9921AUB/V+ is a transimpedance amplifier with integrated CDS (Correlated Double Sampling) circuit that operates from a minimum supply voltage of only 1.7V and is applicable to a wide variety of sensor designs. The IC also has an integrated low noise, high-resolution analog-to-digital converter (ADC). The MAX9921AUB/V+ has very low idle noise, low-power consumption, and input sensitivity in the range of a few μV/V, making it suitable for the most sensitive sensors. It can be used in various applications such as photodiode amplifiers, accelerometers, and pressure sensors.

The MAX9921AUB/V+ transimpedance amplifier integrates a low-pass filter that eliminates power frequencies, allowing it to connect to a variety of types of sensors. The CDS circuit uses two photocells, one for measurement and one for reference. The CDS circuit produces a differential output, which is then amplified by the amplifier circuit. This differential signal is compared to a reference voltage and then converted to the digital domain by the ADC. This digital signal can then be further processed by a microcontroller or any other digital component.

Additionally, high common-mode rejection can be achieved by connecting a ground path to each of the sensing terminals, allowing for more accurate measurements. The low-noise performance of the MAX9921AUB/V+ is also excellent, making it suitable for low-light conditions. The device has an adjustable gain, allowing it to gain-match the input source, and supports up to 4Msps (Mega Samples per second). The device also features shutdown control, which reduces power consumption.

In summary, the MAX9921AUB/V+ transimpedance amplifier is designed to work with a wide range of sensors, offering low-noise, low-power and high-resolution performance. It is applicable in various sensor interfaces, including photodiodes, accelerometers, and pressure sensors, allowing manufacturers to create more advanced designs. Additionally, its integrated CDS circuit offers high common mode rejection and adjustable gain, allowing for more accurate measurements.