AD976AR

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The AD976AR is a high-speed, low-power 13-bit monolithic CMOS voltage-to-digital-converter (VDC) with a built-in reference and automatic offset calibration. The device is packaged in an industry-standard SOT23-5 or SOIC-8. It operates on a single +2.7 V to +5.5 V power supply and features a conversion rate up to 25 MSPS.

The AD976AR is built on a silicon germanium (SiGe) process, which allows the part to achieve high conversion performance with very low power dissipation. This makes the device ideal for a wide range of data acquisition, imaging and communications applications.

Application Field

The AD976AR is ideal for data acquisition, communications, and imaging applications where high performance, low power consumption, and small size are required. Its 13-bit resolution makes it a very attractive option for applications that require very high dynamic range, such as laser range finding, sonar, and radar. The extremely low power consumption of the device allows for its use in battery-operated applications.

The device is capable of converting multiple data formats and can be operated in either single-ended, differential, or pseudo-differential mode. This allows it to be used in a wide variety of applications, including consumer and professional video, telecommunications, and medical imaging.

Working Principle

The AD976AR works by converting an analog input voltage into a digital code. The device uses an internal bandgap reference that is automatically calibrated as part of the conversion process. This ensures that the converter maintains high accuracy over the entire range of input voltages. The converter also features an auto-zeroing circuit that eliminates offset errors. The device is also able to handle high input frequencies, making it suitable for high-speed systems.

The converter consists of a pipeline analog-to-digital converter circuit, a high-speed clock generator, and a digital logic circuit that calculates, stores, and encodes the data. The data is converted into a parallel digital code, with the least significant bit located at the output. The digital code is then stored in internal registers, ready to be output on the LSB pad or the MSB pin.

The AD976AR features an integrated sample-and-hold circuit. This allows the device to take multiple readings of an input signal and calculate the average of the readings. The output of this average can then be compared with the internal reference voltage to determine the digital code output from the device. This averaging allows the part to minimize errors due to noise and minimize the bandwidth requirements of the input signal.

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