Alias-free ADC simplifies front-end design for DC-350kHz applications
Claimed to simplify front end design and to speed up time to market for precision DC-350kHz applications, Analog Devices (ADI) offers the AD7134 alias-free analogue to digital converter (ADC).
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. According to ADI, the AD7134 introduces a new architecture for precision ADCs that fundamentally changes the design process. It removes the need for an 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 samples per second to 1.5 Msamples per second. Inherent anti-aliasing up to 102dB eliminates the need for an external anti-alias filter. Typical applications are AC, vibration or acoustic measurements.
As a result 60 fewer passive components are required and five less active components, reports ADI. The ADC also saves 70 per cent board area, relative to a typical alternative implementation. Using an asynchronous sample rate converter, simplifies multi-device synchronisation to enable users to achieve coherent sampling system with ease. It also simplifies isolation requirements.
Offset error drift is 0.7microV per degree C typical and gain drift is 2ppm per degree C typical.
The AD7134 is packaged in a 56-lead LFCSP, measuring 8.0 x 8.0mm.
