AD7878LPZ

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Data acquisition is an important element of many modern contexts. The ability to convert continuous analog signals (such as those produced by sensors and transducers) into digital information is an essential part of gathering and interpreting data. Analog to Digital Converters (ADCs) are devices that enable this kind of signal conversion.

The AD7878LPZ is a CMOS Sigma-Delta Analog-to-Digital converter (ADC) with a wide range of application fields. It features a low-power operation with low-noise single-end analog-to-digital conversion. The AD7878LPZ features a very small form factor (2.7 mm x 2 mm) and is ideal for applications where a small footprint is desired, such as personal mobile devices, portable healthcare products, and other applications with tiny yet powerful electronics.

The AD7878LPZ is designed to convert signals up to 100 kHz with a resolution of 16 or 24-bits. It comes with a built-in reference voltage of 2.56 V, enabling an input dynamic range of 0 to 5.12V. This higher input dynamic range makes it suitable for applications with a wide range of signal levels, such as strain gauges, thermocouples, or piezo transducers. The AD7878LPZ integrates a low-pass filter (LPF) to reject external noise. The LPF is software programmable with a corner frequency of 2.5 to 65 kHz, making it suitable for a wide range of applications.

The AD7878LPZ features a single-ended 10-bit input channel. This channel is externally configurable using a differential input stage with op-amps for a wide range of input ranges and gains. The AD7878LPZ also comes with a built-in low-voltage reference allowing for easy voltage reference calibration. This reference is programmable and can range from 0.4 V to 2.6 V.

The AD7878LPZ has a unique architecture that ensures a low-power operation of up to 2 mA with a maximum sample rate of 200 ksps. It utilizes a double-pumped sigma-delta structure to ensure low-noise performance. This architecture also allows for clock-clocking, which reduces the overall sample rate needed to acquire the same data.

The working principle of the AD7878LPZ is based on the Sigma-Delta ADC structure. This structure utilizes a high-speed digital-to-analog converter to convert an input analog signal into a pulse-width modulated signal. This PWM signal is then fed into a low-pass filter, which is responsible for reducing the level of noise and thus improving the Signal to Noise Ratio (SNR). The output of the low-pass filter is then digitized by the ADC and the digital output is generated.

In summary, the AD7878LPZ is a low-power, CMOS Sigma-Delta Analog-to-Digital Converter with a wide range of application fields. It is designed to convert signals up to 100 kHz with a resolution of 16 or 24-bits, while utilizing a low-power operation with low-noise single-end analog-to-digital conversion. Its built-in reference voltage allows for easy voltage reference calibration, while its unique architecture ensures a low-power operation of up to 2 mA with a maximum sample rate of 200k sps. It operates on the principle of Sigma-Delta ADCs and is compact, allowing for use in tight spaces and providing high performance in small form factor applications.

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