ADS8684AIDBT

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Data Acquisition - Analog to Digital Converters (ADC)

ADS8684AIDBT is a highly adaptive, high-speed, low-power, 16-bit analog-to-digital converter (ADC). It is specifically designed for single-ended and differential inputs in industrial instrumentation, motor control, and automation applications.

The device consists of a switched-capacitor integrating SAR (successive approximation register) ADC, analog input buffer and reference, data output serializer and latches, and a VCCP-based temperature and power monitor. The presence of the integrated reference, data output serializer, and temperature/power sensor simplifies the design and reduces the component count for applications in data acquisition, control, and industrial automation.

Features

• Sample rate: up to 200KSPS
• Internal reference, 2.048V, -2.048V
• Low power operation: 10mW
• Programmable resolution from 6-bit to 16-bit
• Programmable gain for single-ended and differential input range
• Programmable digital filter for reducing spectral noise
• Built-in temperature and power monitoring

Technical Specifications

• Power Supply: 1.8V-3.6V
• Maximum Sampling Rate: 200KSPS
• Integral Nonlinearity (INL): ± 1LSB
• Differential Nonlinearity (DNL): ± 1LSB
• Input Range: -2.048V to +2.048V for single-ended input and -4.096V to +4.096V for differential inputs
• Output Data Format: 16-bit 2\'s complement
• Resolution: 6-bit to 16-bit
• Aperture Jitter: ± 250ps
• Dynamic Performance: 48dB (SINAD) SNR, 79dB (SFDR) THD at 200KSPS

Working Principle

ADS8684AIDBT is a 16-bit Sar (switched capacitor integrating SAR) ADC that employs a multi-bit analog to digital conversion architecture. The working principle of the device is based on successive approximation register (SAR) converter topology. The SAR architecture can synthesize a sample and hold operation, an integrator (capacitor bank) followed by a quantization process.

The device consists of an integrating capacitor bank, a successive approximation register (SAR) and associated control logic, data output serializer with latches, internal reference and programmable gain amplifier (PGA). The input signal is converted from analog to digital by way of successive approximation steps. The SAR searches for the appropriate value for the digital output for the conversion in the most efficient way.

The output data from the ADC is available via an SPI-compatible serial port and can be multiplexed if required. The device is capable of operating from 1.8V and 3.6V power supplies. The internal reference and PGA incorporated in the device enable a single-ended analog input voltage range from 0V to 2.048V for the single-ended input mode and the differential input mode can span from -4.096V to +4.096V.

Applications

The ADS8684AIDBT is designed to meet the most demanding applications in industries such as energy and power, automotive, medical, industrial automation and control. It is suitable for a wide range of applications in these industries such as motor control, data acquisition and control, test and measurement, factory automation, and process control.

Some of the applications of the ADS8684AIDBT include current sensing, temperature monitoring and control, temperature measurement, motor current measurement, and system health and security monitoring.

The device is also suitable for applications where high accuracy and stability is required, such as in medical, automotive, and industrial automation systems. With its wide dynamic range, low power consumption and high integration, the ADS8684AI DBT is the ideal solution for applications where accurate and fast data acquisition is critical.

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