ADI’s 24-bit sigma-delta A/D converter achieves twice the speed of competing converters

Analog Devices Inc. (ADI) introduced a multiplexed 24-bit sigma-delta A/D converter that doubles the throughput rate of alternative sigma-delta converters while dissipating less power. Designed for process automation and instrumentation systems where data channel density is increasing and channels must be monitored faster, ADI’s new AD7176-2 A/D converter achieves a 50 kSPS (thousand samples per second) multi-channel scan rate. In an automated, high-precision production line, the performance of the AD7176-2 allows for faster manufacturing while achieving the precision, low-input bandwidth signal measurements that are inherently associated with the sigma-delta architecture. Measured on a single channel, the AD7176-2 delivers as many as 17.2 noise-free bits at 250 kSPS and 22 noise-free bits at 5 SPS.

• Download data sheet, view product page, access ADI’s Circuits from the Lab™ reference circuits and request samples: http://www.analog.com/AD7176-2
• Learn more about designing with the sigma-delta converter architecture through this interactive tutorial: http://designtools.analog.com/dt/sdtutorial/sdtutorial.html
• Get support at ADI’s EngineerZone™, an online technical support community: http://ez.analog.com/community/data_converters/precision_adcs

The AD7176-2 A/D converter includes high-precision, on-chip peripherals, including a 2.5 V, ±2.5 ppm/°C reference and ±2.5% internal oscillator that reduce board space and lower bill of materials costs while maintaining high performance. The new converter features flexible on-chip digital filters, which optimize settling, resolution and line frequency rejection. The new converter also can be configured on a per-channel basis allowing for different filter and output data rates as well as per-channel offset and gain error correction.

AD7176-2 24-bit Sigma-Delta A/D Converter Key Features:

• 5 SPS to 250 kSPS output rate for fast and flexible updates
• 17.2 noise free bits at 250 kSPS for more accurate measurements
• Up to 90 dB 50 Hz and 60 Hz line frequency rejection using enhanced 50 Hz and 60 Hz rejection filters
• 7.8 mA total current consumption

The AD7176-2 can be designed into circuits together with ADI’s single-supply, low-noise, low-offset AD8656 CMOS amplifier and single supply, attenuating input stage, AD8475 differential driver.