AD7686BRMZ

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AD7686BRMZ, belonging to Data Acquisition - Analog to Digital Converters (ADC), is a precision low-power, 8-channel, 12-bit analog-to-digital converter with built-in microcontroller. It features an onboard programmable gain amplifier (PGA) and a built-in, self-calibration algorithm for lowest-noise performance. The AD7686BRMZ supports up to ±2.7V input range, with integrated sample and hold (S&H) and reference. The 16-bit controller serial interface is a standard I2C protocol.

Application Field

The AD7686BRMZ can be used in a vast range of applications where precision analog-to-digital conversion is necessary such as medical monitoring and imaging systems, radar systems, IoT applications and industrial equipment. It can convert a wide range of analog signals including electrocardiogram (ECG) signals, infrared (IR) signals, monitoring sensors, wheelchair navigation, magnetic field sensing and temperature sensing.

AD7686BRMZ is especially suited for low-power portable devices such as battery-powered wireless meters and heart monitoring devices. Furthermore, its on-chip calibration algorithm assures reduced-noise performance and best-in-class total harmonic distortion (THD) over its entire operating temperature range.

Working Principle

The AD7686BRMZ converts analog input voltages into 12-bit digital codes. The conversion consists of several steps. First, the analog input is applied to the input multiplexer (MUX) which is controlled by the AD7686B via I2C bus to select the desired analog channel. The input signal is then applied to the low-noise programmable gain amplifier (PGA) where the input voltage range can be programmed. The PGA buffers and amplifies the analog signal before the sample-and-hold (S&H) stage. The S&H stage consists of a low-drift capacitor array, which helps reduce the impact of switching capacitors on the system stability and accepts the incoming signal and holds on it between conversions.

Finally, the held-data is applied to the analog-to-digital converter (ADC), where it is parallelly compared to an internal voltage reference. The output of the ADC is a 12-bit digital word. All the control and processing functions of the AD7686BRMZ are controlled by the on-chip 16-bit controller.

The power consumption of the AD7686BRMZ is low enough to permit it to be powered from a single 1.8V supply. Additionally, multiple sleep modes are available for further power reduction.

In summary, the AD7686BRMZ is a low-power precision 12-bit ADC with a built-in microcontroller, offering a complete solution for a variety of low-power applications such as medical monitoring and imaging systems, IoT applications and industrial equipment.

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