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YOUR SEMICONDUCTOR SOLUTIONS RESOURCEVolume 10, Issue 2

ANALOG-TO-DIGITAL
CONVERTER AND DRIVER ICs

Precision Σ-Δ ADC with Configurable Filtering Adds Flexibility to Industrial Measurement System Designs

Engineers designing industrial measurement systems must take into account the need to reject 50 Hz and 60 Hz power line frequencies in sensitive signal chains. Some system modules need a high level of power line rejection and must sacrifice conversion speed to meet these requirements, while other system modules must provide faster conversion speeds but still maintain some reduced level of power line rejection. Until now, the design engineer had to select and qualify two separate Σ-Δ ADCs to meet requirements in these two types of data measurement systems.

Solution
The AD7194 8-/16-channel, 4.8 kHz, ultralow noise, 24-bit Σ-Δ ADC with integrated PGA and fast settling filter is the first ADC to offer design engineers a flexible approach to solving the power line rejection problem. The AD7194 contains a regular sinc filter, which gives excellent rejection of 50 Hz and 60 Hz line frequencies. However, the device also offers a fast settling filter option, which allows customers to achieve nearly four times the conversion speed, while maintaining around 40 dB of line frequency rejection. With this flexibility in application, system designers can utilize one Σ-Δ ADC IC for multiple industrial measurement system requirements, saving time to market and R&D costs.

AD7194

  • PLC/DCS analog input modules
  • Test and measurement systems
  • Temperature measurement
  • Scientific instruments

AD7194 Features

  • Fast settling filter option
  • Ultralow noise
  • On-chip PGA
  • 16 channels in 32-lead, 5 mm × 5 mm LFCSP
ADI engineers offer multiple tested circuit solutions for designing a precision weigh scale system. For access to these circuit notes, visit www.analog.com/circuits and view the News section.
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