描述The ADS1174 (quad) and ADS1178 (octal) are multiple delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 52k samples-per-second (SPS), which allow synchronous sampling of four and eight channels. These devices use identical packages, and are also compatible with the high-performance 24-bit ADS1274 and ADS1278, permitting drop-in upgrades.The delta-sigma architecture offers near ideal 16-bit ac performance (97dB SNR, -105dB THD, 1LSB linearity) combined with 0.005dB passband ripple and linear phase response.The high-order, chopper-stabilized modulator achieves very low drift (2μV/°C offset, 2ppm/°C gain) and low noise (1LSBPP). The on-chip finite impulse response (FIR) filter provides a usable signal bandwidth up to 90% of the Nyquist rate with 100dB of stop band attenuation while suppressing modulator and signal out-of-band noise.Two operating modes allow for optimization of speed and power: High-speed mode (31mW/Ch at 52kSPS), andLow-power mode (7mW/Ch at 10kSPS).A SYNC input control pin allows the device conversions to be started and synchronized to an external event. SPI and Frame-Sync serial interfaces are supported. The device is fully specified over the extended industrial range (40°C to +105°C) and is available in an HTQFP-64 PowerPAD package.特性Simultaneously Sample Four/Eight ChannelsSelectable Operating Modes:High-Speed: 52kSPS Data Rate, 31mW/chLow-Power: 10kSPS Data Rate, 7mW/chAC Performance:25kHz Bandwidth97dB SNR-105dB THDDC Performance:2μV/°C Offset Drift2ppm/°C Gain DriftDigital Filter:Linear Phase ResponsePassband Ripple: ±0.005dBStop Band Attenuation: 100dBSelectable SPI or Frame Sync Serial InterfaceSimple Pin-Driven ControlLow Sampling Aperture ErrorSpecified from -40°C to +105°CAnalog Supply: 5VI/O Supply: 1.8V to 3.3VDigital Core Supply: 1.8VAPPLICATIONS3-Phase Power MonitorsDefibrillators and ECG MonitorsCoriolis Flow MetersVibration/Modal AnalysisPowerPAD is a trademark of Texas Instruments. SPI is a trademark of Motorola, Inc.