Delta-sigma ADC has excellent DC accuracy and outstanding AC performance

Available from Farnell element14, the Texas Instruments ADS127L01 is a 24-bit, delta-sigma ADC with data rates up to 512kSPS. This device offers a unique combination of excellent DC accuracy and outstanding AC performance. The high-order, chopper-stabilised modulator achieves very low drift with low in-band noise. The integrated decimation filter suppresses modulator out-of-band noise. In addition to al low-latency filter, the device provides multiple Wideband filters with less than ±0.00004dB of ripple, and an option for –116dB stop-band attenuation at the Nyquist rate. Traditionally, industrial delta-sigma ADCs that offer good drift performance use digital filters with large passband droop. As a result, industrial delta-sigma ADCs have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than industrial counterparts. The device combines these converters, providing high-precision industrial measurement with excellent dc and ac specifications over an extended industrial temperature range of –40C to +125C. A variety of operating modes allow for optimisation of speed, resolution, and power. A programmable serial interface with one of three options (SPI, frame-sync slave, or frame-sync master) provides convenient interfacing across isolation barriers to microcontrollers or digital signal processors.