Traditional precision data-acquisition signal chain design tends to be 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, which means the device requires 60 fewer passive components and five fewer active components. It also saves 70% board area, relative to a typical alternative implementation. An asynchronous sample-rate converter simplifies multi-device synchronisation and enables user to achieve coherent sampling system more easily.
AD7134 features include:
- 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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