Alias-free ADC boosts performance and ease of use

November 25, 2020 //By Jean-Pierre Joosting
Analog Devices has introduced the AD7134 alias-free ADC
Anti-aliasing up to 102 dB eliminates the need for an external anti-alias filter — requiring 60 fewer passive components and five fewer active components.

Analog Devices (ADI) 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 to 350 kHz 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 10 SPS to 1.5 MSPS.  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 synchronization, enables user to achieve coherent sampling system with ease, and simplifies isolation requirements.

The AD7134 offers THD of -120 dB typical (ideal for AC, vibration or acoustic measurements) and 108 dB dynamic range (at ODR = 374 kSPS). Other features include multiple linear phase digital filter options (SINC6 for low latency, FIR for passband flatness); typical offset error drift of 0.7 uV/°C; and a gain drift of 2ppm/°C typical.

The AD7134 offers significant system size reduction, simplifies the signal chain design, makes the system more robust, and reduces the overall time to market with easy design-in without trading any performance parameters demanded by precision instrumentation applications.

www.analog.com


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