Highly-integrated low-noise low-drift 38.4-kSPS delta-sigma ADCs

The new ADS1262 and ADS1263, from Texas Instruments (TI), are low-noise, low-drift, 38.4-kSPS, delta-sigma (?S) ADCs with an integrated PGA, reference, and internal fault monitors. The ADS1263 integrates an auxiliary, 24-bit, ?S ADC intended for background measurements. The sensor-ready ADCs provide complete, high-accuracy, one-chip measurement solutions for the most-demanding sensor applications, including weigh scales, strain-gauge sensors, thermocouples, and resistance temperature devices (RTD). The ADCs are comprised of a low-noise, CMOS PGA (gains 1 to 32), a ?S modulator, followed by a programmable digital filter. The flexible analog front-end (AFE) incorporates two sensor-excitation current sources suitable for direct RTD measurement. A single-cycle settling digital filter maximizes multiple-input conversion throughput, while providing 130dB rejection of 50Hz and 60-Hz line cycle interference. The ADS1262 and ADS1263 are pin and functional compatible. These devices are available in a 28-pin TSSOP package and are fully specified over the -40C to +125C temperature range.