C o n t e n t s

ADC with Configurable Filtering Adds Flexibility >>

High Speed ADC Portfolio Responds to Market Demands >>

High Performance ADC Dissipates Only 15 mW to Solve Heat Dissipation >>

Smallest SAR ADC Targets Space-Constrained Applications >>

ADC Selection Guide >>

ADC Selection Guide, continued >>

ADC with Integrated Quadrature Error Correction Minimizes Errors >>

Why Use an ADC Driver Amplifier? >>

Circuits from the Lab—Tested Design Resource >>

Buffer Enhances Clock Integrity to Enable Rated Performance from High Performance >>

Diff Amp Calculator Design Tool >>

All prices in this bulletin are in USD in quantities greater than 1000 (unless otherwise noted), recommended lowest grade resale, FOB U.S.A.



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.

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.


  • 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.

Visit our new website for data sheets, samples, and additional resources.


Make a Difference Analog Devices