The AD7768 8-channel A/D converter features a power scalable modulator and digital filter on each channel to enable synchronized, precise measurement of both ac and dc signals in instrumentation applications. The 256-ks/s data rate per channel converter has a dynamic range of 108 dB, 110.8-kHz maximum input bandwidth, and −120-dB total harmonic distortion typical.
The IC has ±2 ppm of full-scale range INL, ±50-μV offset error, and ±30-ppm gain error. It delivers improved power quality monitoring through the ability to detect harmonic distortion over a wider bandwidth for detection and diagnosis of grid imbalance.
The chip operates over −40°C to +105°C and comes in a 64-lead LQFP package. A four-channel version and a 16-bit version are also available. From $18.95 ea/1,000, available now.
The 24-bit device is said to have a 6-dB dynamic range advantage over the nearest competing product and delivers integral non-linearity (INL) performance across the widest available bandwidth, in addition to achieving 10 times better offset, a 30 times reduction in gain error, and a 2 times improvement in gain drift.
Applications include data acquisition systems, USB/PXI/Ethernet Instrumentation, industrial control loops, audio test and measurement, vibration and asset condition monitoring, Sonar systems, three-phase power quality analysis, and high-precision medical electroencephalogram (EEG)/electromyography (EMG)/electrocardiogram (ECG) systems.
The AD7768 offers extensive digital filtering capabilities, such as a wide-band antialiasing low-pass filter with low ±0.005-dB pass-band ripple, sharp roll-off, and 105-dB stop band attenuation at the Nyquist frequency.
Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band from dc to 102.4 kHz at 256 ks/s from dc to 51.2 kHz at 128 ks/s, or from dc to 12.8 kHz at 32 ks/s.
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