The new ADS1672 from Texas Instruments is a 24-bit, 625 kSps delta-sigma analog-to-digital converter (ADC) featuring a combination of wide bandwidth, good AC and DC performance, and a dual-path digital filter to give flexibility to designers of automated test equipment, test and measurement, medical instrumentation, vibration analysis and sonar/military equipment.
The user-selectable dual-path digital filter allows designers to optimise the trade-off between bandwidth and latency to maximise performance of their application. The wide-bandwidth path provides AC performance of 305 kHz bandwidth path and very low passband ripple, enabling continuous measurements, such as those required in sonar, vibration monitoring and communications equipment. The low-latency path provides settling time of only 5,5 μs for applications with transient inputs or when used with a multiplexer.
The ADS1672 integrates a chopper-stabilised modulator, which enables both AC performance and DC accuracy characteristics. For example, it is possible to achieve AC performance of 107 dB dynamic range at 625 kSps, 116 dB dynamic at 78 kSps and -115 dB total harmonic distortion (THD), and DC accuracy of 3 ppm integral nonlinearity, 2 μV/C offset drift and 2 ppm/C gain drift.
The IC features a selectable serial interface, either LVDS or CMOS, for connectivity to MCUs, DSPs or FPGAs. Operating from a single 5 V analog supply and 3 V digital supply, it dissipates only 350 mW of power and is fully specified over the industrial temperature range of -40°C to 85°C.
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