Fastest 18-bit SAR ADC

23 October 2013 Analogue, Mixed Signal, LSI

Analog Devices has unveiled an 18-bit PulSAR analog-to-digital converter (ADC) whose 5 MSps throughput it claims is twice the speed of any available SAR (successive-approximation register) converter. With its high throughput, low noise floor and high linearity, the AD7960 was designed for low-power signal chains, multiplexed systems such as digital X-ray, and oversampling applications including spectroscopy, MRI gradient control and gas chromatography.

The chip consumes 39 mW at 5 MSps and is optimised for excellent DC linearity (±0,8 LSB INL) and AC performance (99 dB SNR) even at full throughput. It also features a noise floor of 22,4 nV/Hz relative to its full scale input which, combined with a small package size, helps designers meet space, thermal, power and other key design challenges common to high-channel-density systems.

Released in parallel with the AD7960 is the AD7961, a 16-bit PulSAR ADC which achieves a signal-to-noise ratio of 95,5 dB and INL of ±0,2 LSB at 5 MSps.

The two ICs provide a pin-compatible upgrade/downgrade path for 16- and 18-bit data acquisition applications in instrumentation and healthcare. They include a flexible, low-noise LVDS (low-voltage differential signalling) interface which transfers data off chip at speeds up to 300 MHz.

Related evaluation tools such as reference circuits, development kits and FPGA mezzanine cards include all HDL code and device drivers for easy integration with FPGAs and support faster development in a simplified design environment.

For more information contact Erich Nast, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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