AD7581CQ

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The AD7581CQ is part of the growing family of data acquisition, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) from Analog Devices Inc. Designed for special-purpose applications, this device is a low-cost, 12-bit plus sign ADC with a programmable differential reference and track-and-hold function. Thanks to its selection of serial or parallel interface and enhanced performance level, the AD7581CQ is suitable for a wide variety of applications including test instruments, industrial process monitoring and control systems.

AD7581CQ Application Field

The AD7581CQ serves as an ideal solution for a variety of data acquisition applications, such as process control, remote sensing, process monitoring, test and measurement, industrial automation, and embedded systems. As a low-cost, 12-bit plus sign ADC with a programmable differential reference and track-and-hold function, extended temperature operation and fast conversion time, it provides users with the convenience to obtain accurate and stable measurements from any analog signal.

With the programmable differential input, the device can be used to directly measure thermocouples, pressure, flow and other inputs that require gain and offset adjustments. The track-and-hold function enables the device to acquire reproducible instantaneous readings from such fast changing signals, a feature not generally included in other ADC products. The adjustable speed/resolution allows users to adjust the conversion speed and resolution to suit their requirements in specific applications. The AD7581CQ features a wide input dynamic range, taking advantage of its linearity, accuracy and resolution.

Whether the configuration type is single-ended, differential or mix-and-match, the 12-bit plus sign ADCs satisfy the needs of many data acquisition systems. Its versatile programmable inputs include a built-in 2V range as well as a 0-10V range, allowing various input levels. In addition, the device produces two separate supply voltages (VDD and VDD2) that simplify the wiring and thereby reduce the number of external parts in the design.

AD7581CQ Working Principle

The working principle of the AD7581CQ is fairly simple. The analog input signal is first brought into the device through the ADC input pins. The sign of the input is determined, and then the signal is compared with a reference voltage set at the midpoint of the input range. The magnitude of the voltage is then converted into a digital output using a 12-bit, plus sign ADC.

The reference voltage is adjustable with an external potentiometer. Thus, if an input signal exceeds the reference voltage, its value is converted into a positive digital output while a negative signal produces a negative output. This allows the device to handle positive and negative values up to -10V and +10V.

The ADC is also equipped with a track-and-hold function that enables the device to freeze and digitize inputs within 10µS. This allows users to acquire dimming signals from fast-moving processes such as pressure, flow and temperature gradients. The device also comes with a noise suppressor function that reduces noise when measuring slow moving signals or at high input range.

In addition, the AD7581CQ features an AutoZero feature that greatly reduces input offset errors. When the device is first powered on, the AutoZero performs an initial conversion and holds the digital result until the start of the next conversion. This technique is used to accurately measure signals with low signal-to-noise ratio (SNR) or to improve the accuracy of multiple conversions.

Finally, the device offers a wide range of serial and parallel communication interface options including serial port, SPI, I2C and parallel port. Data is transferred from the device using either of these interfaces and it is then converted back to an analog signal depending on the application. The device offers a choice of eight channel configurations and programmability, allowing for a variety of applications to be designed.

To sum up, the AD7581CQ is an ideal solution for specializing any data acquisition system. The device provides low-cost, high-performance, high-channel-density and flexible communications for a wide variety of applications. Its adjustable speed/resolution and track-and-hold capabilities make it a leader in the ADC market.

The specific data is subject to PDF, and the above content is for reference