ADS1278

www.DataSheet4U.com AD S1 274 AD S1 278 www.ti.com ADS1274 ADS1278 SBAS367 – JUNE 2007 Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters 1 FEATURES Simultaneously Measure Four/Eight Channels Up to 128kSPS Data Rate AC Performance: 62kHz Bandwidth 111dB SNR (High-Resolution Mode) –108dB THD DC Accuracy: 0.8μV/°C Offset Drift 1.3ppm/°C Gain Drift Selectable Operating Modes: High-Speed: 128kSPS, 106dB SNR High-Resolution: 52kSPS, 111dB SNR Low-Power: 52kSPS, 31mW/ch Low-Speed: 10kSPS, 7mW/ch Linear Phase Digital Filter SPI™ or Frame-Sync Serial Interface Low Sampling Aperture Error Modulator Output Option (digital filter bypass) Analog Supply: 5V Digital Core: 1.8V I/O Supply: 1.8V to 3.3V 234 DESCRIPTION Based on the single-channel ADS1271, the ADS1274 (quad) and ADS1278 (octal) are 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 128k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop-in expandability. Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they 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 respective industrial counterparts. The ADS1274 and ADS1278 comb...