ADCs push resolution, sample rate with filter features

June 10, 2021 // By Peter Clarke
ADCs push resolution, sample rate with filter features
Texas Instruments has introduced a family of successive approximation register (SAR) analog-to-digital converters (ADCs) with resolutions to 18bits and sample rates up to 125MSPS.

The ADC3660 family includes eight SAR ADCs in 14-, 16- and 18-bit resolution at sampling speeds ranging from 10 to 125 MSPS, helping designers improve signal resolution, extend battery life and strengthen system protection.

TI claims the ADC3660 family delivers up to 80 percent lower latency than competitive devices at similar speeds. For example, system designers can achieve one-clock (8 ns) ADC latency with the 125-MSPS, 14-bit, dual-channel ADC3664. The family’s latency enables high-speed digital control loops in a wide variety of industrial systems to more accurately monitor and respond to voltage and current spikes, increasing tool precision in applications such as semiconductor manufacturing systems.

TI claims the ADC3683 is the industry’s fastest 18-bit ADC at 65 MSPS and that it improves noise performance in narrowband-frequency applications such as portable defense radios, offering a signal-to-noise ratio (SNR) of 84.2 dB and a noise spectral density of -160 dBFS/Hz while maintaining low power consumption of 94 mW per channel.

Consuming 36 mW total, the 10-MSPS, 14-bit ADC3541 simplifies thermal management and extends battery life in power-sensitive applications such as GPS receivers or handheld electronics. And the 65-MSPS, 16-bit ADC3660 delivers 82 dBFS SNR, improving image resolution in sonar applications while consuming 65% less power (71 mW per channel) than the equivalent competitive device.

Other family features that reduce design complexity include on-chip decimation options that enable designers to easily remove unwanted noise and harmonics in the system and boost SNR and spurious-free dynamic range up to 15 dB.

The ADC3563, ADC3583, ADC3643, ADC3660, ADC3663, ADC3664 and ADC3683 are available now from TI in a 5mm-by-5mm very thin quad flat no-lead (WQFN) package. Pre-production versions of the ADC3541 are available, with volume production expected in the first quarter of 2022. Evaluation modules are available from TI for US$249.

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