18-bit AD4003 and 16-bit AD4000 SAR analog-to-digital converters. Source: Analog Devices The high performance and ease of use of the 2-MSPS, 18-bit AD4003 and 16-bit AD4000 SAR ADCs greatly ease the efforts of system designers tasked with achieving optimum performance in data acquisition designs within a shorter design cycle, and without the need for making often-difficult and conflicting technical tradeoffs. Features such as high input-impedance mode and span-compression mode reduce the design challenge associated with the ADC driver stage and increase the flexibility of amplifier selection.
The high input-impedance mode allows the use of low-power precision amplifiers to directly drive the ADC, and reduces the signal-chain power demands. In addition, the internal over-voltage protection removes the need for external protection devices, and the span compression enables the ADC driver stage to operate from the same supply rail as the ADC, thus simplifying power management. This combination supports increased channel density while lowering the system-level power requirements, without compromising performance.
The AD400x series includes 20-, 18- and 16-bit SAR ADCs with speed options from 500 kSPS to 2 MSPS. The AD4000 is priced at $12.75 each in 1,000-piece quantities, while the AD4003 is priced at $19.85 each in 1,000-piece quantities.
