Simplify the design of analog anti-aliasing filters and other functional circuits

Precision analog-to-digital converters (ADCs) serve as a crucial bridge between real-world signals and advanced digital signal processing systems, making them essential in high-end industrial test and measurement applications. However, connecting a sensor or another signal source to an ADC and achieving the performance advertised by the manufacturer is not always straightforward. Additional circuitry such as buffering, voltage protection, or other functions is often required to ensure optimal performance. So, how can you simplify this challenge? The LTC2358, a new 8-channel ADC from Analog Devices, features an integrated picoampere input analog buffer that not only matches the high performance of the LTC2348 but also offers greater flexibility for arbitrary input measurements. This buffer provides a high-performance FET input stage, allowing for direct connection to various low-current sensors and simplifying the design of anti-aliasing filters and other circuits. One key advantage of the LTC2358 is its ability to directly interface with many sensors without requiring intermediate signal conditioning. Traditional 8-channel ADCs often require multiple op amps for buffering, but the LTC2358 eliminates this need, saving board space and power. For example, thermistors can be connected directly to the ADC using a simple resistive divider, ensuring accurate measurements even when the reference voltage drifts. When working with thermistors, choosing a low resistance value can lead to significant power consumption, while high-resistance values demand very high input impedance. The capacitive input of the LTC2358 addresses this issue, and adding a 20kΩ resistor can further enhance accuracy. Additionally, the ADC's high sampling rate and low noise allow for fast measurements, reducing the time the thermistor spends heating up during operation. In cases where the ADC input exceeds its full-scale range, the LTC2358 handles it gracefully. If the input voltage goes beyond the programmed range, the ADC simply reports a saturation value without affecting other channels or increasing power consumption. In more extreme situations, where the input may exceed the supply voltage, internal diode clamps protect the device, and a series resistor can be used to limit current safely. The LTC2358’s ultra-low input current—typically less than 10 pA at room temperature—makes it ideal for applications involving photodiodes or other low-current sensors. By measuring the voltage across a resistor instead of the op-amp output, the ADC can bypass op-amp offset and noise issues, providing more accurate results. This feature significantly simplifies the design of low-power analog front-ends and enhances system reliability. Overall, the LTC2358 offers a powerful and flexible solution for multichannel systems, combining direct sensor connectivity, robust overdrive handling, and superior performance in a compact package. Whether you're dealing with thermistors, photodiodes, or other sensitive signals, the LTC2358 provides a streamlined path to accurate and reliable data acquisition.

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