ADS8548SPM

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Analog to Digital Converters (ADCs) can be broadly classified into successive approximation (SAR), successive delta modulation (SDM), and Sigma-Delta (also known as Σ-Δ or delta-sigma) ADCs. Out of all the different types of ADCs, the Sigma Delta Modulation type is generally the most popular and widely used ADC technology. This is because of its outstanding features such as high resolution, low latency, low power consumption, simple two-stage architecture, and low-cost. One such Sigma Delta Modulation type ADC chip is the ADS8548SPM.

In this article, we will discuss the application field and working principle of the ADS8548SPM. This chip is a low-power, low-voltage, 16-bit delta-sigma, successive approximation, analog-to-digital converter designed for high-speed, low-power data acquisition systems. It is ideal for use in applications that require high dynamic range, low-noise, and accuracy such as audio, telecom, and medical.

The ADS8548SPM features a single channel, 17-bit high-speed analog-to-digital converter with a 2.5V reference input. It supports a wide range of input signal formats, including bipolar and unipolar, and has a 77 dB signal-to-noise ratio. It also features a fully differential track-and-hold and a simultaneous sampling of multiple inputs.

The working principle of the ADS8548SPM is relatively simple. It uses a successive approximation register (SAR) architecture to convert analog input signals to digital format. The SAR architecture works by comparing the input signal to a reference voltage and then adjusting the number of bits and bits signals that are sent out to either a more positive or more negative level until the analog input signal and the reference voltage are equal. Once the correct number of binary bits has been sent out, the conversion is complete.

The ADS8548SPM also features a low-power, selectable asynchronous out-of-lock monitor, which can be used to reduce power consumption and speed up conversions. It also has an on-chip temperature sensor that provides a temperature-compensated output. The ADS8548SPM operates at a throughput rate of up to 6.5ms/ conversion, and its power consumption is only 4.8mA when powered via a single 2.5V power supply.

Overall, the ADS8548SPM is a highly advanced delta-sigma, successive approximation analog-to-digital converter suited for high-speed, low-power data acquisition systems. It features a 2.5V reference input, a 77 dB signal-to-noise ratio, a low-power selectable asynchronous out-of-lock monitor, an on-chip temperature sensor, and a 6.5ms/ conversion throughput rate with only 4.8mA of power consumption.

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