Texas Instruments has released two multichannel, 16-bit, delta-sigma analog-to-digital converters (ADCs), which combine high DC accuracy and AC performance with cost-effective integration. The ADS1174 (4-channel) and ADS1178 (8-channel) provide a simultaneous-sampling measurement system for demanding signal acquisition applications, such as power metering, defibrillators and ECG monitors, as well as pressure sensors, coriolis flow meters and vibration/modal analysis.
Both devices feature 25 kHz bandwidth, 2 μV/°C offset drift and up to 97 dB signal-to-noise ratio (SNR). Two operating modes allow for optimisation of speed (52 Ksps) or power dissipation (7 mW/channel).
Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop, resulting in limited signal bandwidth and being mostly suited for DC measurements. High-resolution ADCs for audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly worse (and often unspecified) than their industrial counterparts.
The ADS1174 and ADS1178 combine these two types of converters, allowing high-precision industrial measurements with excellent DC and AC specifications. The high-order, chopper-stabilised modulator achieves low drift and low noise over the signal bandwidth of DC up to the Nyquist frequency. The onboard decimation filter suppresses modulator and out-of-band noise, providing a usable signal bandwidth up to 90% of the Nyquist rate with stopband attenuation of 100 dB.
A selectable SPI or frame sync serial interface allows for convenient interfacing to DSPs, FPGAs and microcontrollers. Either interface supports daisy chaining to simplify readback of multiple ADCs in high channel-count systems. The ADCs are fully specified over the industrial temperature range of -40°C to +105°C.
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