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Alias-free AD7134 ADC enables increased functionality

20th January 2021
Alex Lynn

Analog Devices has introduced the AD7134 alias-free analogue-to-digital converter (ADC) that significantly simplifies front-end design and speeds up time to market for precision DC-350kHz applications. Traditional precision data-acquisition signal chain design is a time-consuming activity as designers balance anti-alias filter requirements, passive component tolerances, phase and gain errors, as well as high-speed ADC drive requirements.

The AD7134 introduces a new architecture for precision ADCs that fundamentally changes the design process. The new device removes the need for anti-alias filter, and its resistive input significantly simplifies ADC drive.

The AD7134 is a quad-channel, 24-bit precision ADC with output data rate scalable from 10SPS to 1.5MSPS.  Inherent anti-aliasing up to 102 dB eliminates the need for an external anti-alias filter, thus requiring 60 fewer passive components and five fewer active components. It also saves 70% board area, relative to a typical alternative implementation. 

Asynchronous sample-rate converter, simplifies multi-device synchronisation, enables user to achieve coherent sampling system with ease, and simplifies isolation requirements.

AD7134 key features:

  • Alias-Free: inherent antialias rejection up to 102.5dB, typical.
  • THD: -120dB typical (ideal for AC, vibration or acoustic measurements).
  • 108dB dynamic range (at ODR = 374kSPS).
  • Multiple linear phase digital filter options (SINC6 for low latency, FIR for passband flatness).
  • Offset error drift: 0.7uV/°C typical.
  • Gain drift: 2ppm/°C typical.

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