AD7887ARM

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Data Acquisition - Analog to Digital Converters (ADC)

The AD7887ARM is an 8-bit successive approximation ADC that is used to sample and digitize analog signals or voltages and convert them into digital signals. The chip offers high performance and superior noise immunity, making it suitable for a wide range of applications including industrial, medical, and automotive designs. It is easily programmable and supports single-ended or differential analog inputs.

AD7887ARM has an integrated signal conditioning circuit so it can directly process signals from transducers and sensors. It offers a high speed of up to 25 mega-samples per second or 423 kilo-samples per second, depending on the signal being sampled. The signal can be sampled and converted in as little as 66 microseconds, which is much faster than the typical 10 to 20 millisecond conversion time required for traditional ADC designs. The chip also features built-in temperature, supply and noise monitoring, enabling a wide operating temperature range from -40°C to 125°C.

The AD7887ARM is designed to operate from a single-supply voltage of 2.7V to 5.5V and features a low supply current of just 300µA, making it suitable for low power applications. It consumes less than half the power of a linear ADC, resulting in up to 50% savings in power consumption. It also offers excellent noise immunity, with high common mode rejection of -66 dB at 1kHz.

In terms of its working principle, the AD7887ARM uses a successive approximation register (SAR) to convert analog voltage into digital information. The SAR includes an internal comparator and a resistor network to sample and compare the analog voltage to a known reference voltage. The SAR then outputs a binary number that represents the analog voltage level. This conversion technique allows the ADC to deliver highly accurate digital representations of the analog inputs.

The AD7887ARM is a highly integrated 8 bit successive approximation analog to digital converter designed to provide high accuracy and low power consumption for a wide range of industrial, automotive, medical and consumer applications. The device is DC-coupled and is easily programmable for single-ended or differential analog inputs, providing accurate conversion results over a wide range of temperatures and supply voltages. The device consumes only 300µA of supply current and is capable of sampling signals up to 25MSPS, allowing for fast and reliable conversion of analog signals into digital values.

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