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Linear Tech debuts 15Msps, 18bit no latency SAR ADC

Posted: 01 Oct 2015     Print Version  Bookmark and Share

Keywords:Linear Technology  ADC  industrial 

Linear Technology Corp. has unveiled what it describes as an ultrafast 15Msps, 18bit successive approximation register (SAR) analogue-to-digital converter (ADC) with no cycle latency and no pipeline delay. According to the company, the LTC2387-18 digitises wideband analogue signals up to the Nyquist frequency with very low distortion.

Applications of the device include communications, high speed imaging and instrumentation that traditionally use fast throughput pipelined ADCs can now achieve 20dB signal-to-noise ratio (SNR) improvement compared to pipelined ADC architectures, added the company.


The LTC2387-18 achieves an SNR of 95.7dB and realises -101dB total harmonic distortion (THD) while digitising a 1MHz analogue input signal. The high SNR and low distortion performance, combined with fast digitising throughput, enable the ADC to measure very low signal levels with greater precision and accuracy, thus improving image contrast and definition in high end imaging applications. In addition, the no latency operation enables use in data acquisition systems that require fast control loops. To limit noise introduced from the digital outputs, the sampled data of this ADC is communicated via single- or dual-lane serial LVDS outputs to the host processor, providing good noise immunity for noise-sensitive applications.

The LTC2387-18 is the lead product in a pin-compatible family of 18bit and 16bit SAR ADCs with sampling rates ranging from 5Msps to 15Msps, releasing through 2015. The LTC2387-18 is available in a 32-lead 5mm x 5mm plastic QFN package, specified over the commercial and industrial temperature ranges, priced starting at $38.95 in 1,000-piece quantities. Samples and demo boards are available.

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