AD7687BCPZRL7

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The AD7687BCPZRL7 from Analog Devices is an 8-bit, low power, low cost, successive-approximation register (SAR) analog-to-digital converter (ADC). It is designed for use in applications such as consumer electronics, data acquisition systems, automation, and industrial control. The AD7687BCPZRL7 is a plug-and-play device that allows for convenience and flexibility in system designs.

Features

The AD7687BCPZRL7 has a maximum sample rate of 1 MSPS (1 million samples per second). It features an internal reference (1.2V) with an accuracy of ±2.5% and a tolerance of ±1%. The device can operates in single-ended or differential modes, allowing for a wide range of input. It has an 85 dB SNR and an 86 dB SINAD, and consumes 45mW at 5V (typical). The device also features an asynchronous reset, internal track-and-hold, and an optional watchdog timer.

Application Fields

The AD7687BCPZRL7 is well suited for applications dealing with analog signals, including temperature sensing and measurement, data logging and capture, image and video processing, robotics, automotive, and industrial control. The device can be used in a wide range of product designs, from consumer portable electronics and PC peripherals to designed systems, such as handheld and instrumentation products.

Working Principle

The AD7687BCPZRL7 is a SAR ADC, which works by repeatedly guessing the value of an analog signal and narrowing down the range of possible digital values until it finds the right value. This process is based on the voltage-to-time conversion method, where an internal oscillator produces a reference clock, which is compared with the voltage at the analog input to determine the digital value. The device begins by making an initial guess and then repeatedly tweaking the guess in order to narrow down the range of possible values. After all of the bits are set, it compares the final guess with the voltage on the analog input, and if they are equal, the conversion is complete.

To ensure accurate and reliable operation, the device features a wide range of safety features, such as overvoltage and undervoltage protection, clock synchronization, analog start control, thermal shutdown, power-on reset, and a watchdog timer. In addition, the device can be calibrated to compensate for any mismatches between the analog input and the reference voltage.

Conclusion

The AD7687BCPZRL7 is a low power, low cost, 8-bit SAR ADC designed for use in applications that require reliable analog signal conversion. It has a wide range of features, including an internal reference and overvoltage and undervoltage protection, enabling it to be used in a variety of applications. The device is ideal for use in consumer portable electronics, data logging and capture, image and video processing, robotics, automotive, and industrial control.

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