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TI's answer to the growing need for increased signal detection capability in industrial applications is a new family of SAR ADCs that deliver up to 95 dB of dynamic range at sample rates up to 125 megasamples per second. To better understand the impact of these specifications, let's use a sonar system as an example.

In a sonar system, such as a fish finder, several sonar transducers emit acoustic waves in a frequency sweep known as a chirp that then reflect off of objects, back to the transducers. Using digital signal processing, the location and depth of an object, such as a fish, can be computed and visualized on a display.

The dynamic range, or signal-to-noise ratio of the sonar signal chain, determines how accurately the reflected acoustic waves can be digitized. Utilizing sample rates up to 125 megasamples per second, the ADC3660 family offers up to 18 bits of resolution that will increase object sensitivity and detection in sonar applications.

With a one megahertz sine wave input, the 14-bit ADC3643 achieves 79 dBFs SNR with 87 dBFs THD. Moving to the 18-bit ADC3683, an SNR of 83 dBFs and THD of 91 dBFs is achieved. Applying on-chip estimation, the SNR improves up to 94 dBFs and THD to 120 dBFs. This improvement in SNR and THD translates directly to object detection accuracy and resolution that is represented on the display.

Of course, this opportunity for improved accuracy and resolution offers substantial benefits to a wide array of industrial applications. To learn more, ti.com/adc3660.

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