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), and Low-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.
● Simultaneously Sample Four/Eight Channels
● Selectable Operating Modes:
●High-Speed: 52kSPS Data Rate, 31mW/ch
●Low-Power: 10kSPS Data Rate, 7mW/ch
● AC Performance:
●25kHz Bandwidth
●97dB SNR
●-105dB THD
● DC Performance:
●2µV/°C Offset Drift
●2ppm/°C Gain Drift
● Digital Filter:
●Linear Phase Response
●Passband Ripple: ±0.005dB
●Stop Band Attenuation: 100dB
● Selectable SPI or Frame Sync Serial Interface
● Simple Pin-Driven Control
● Low Sampling Aperture Error
● Specified from -40°C to +105°C
● Analog Supply: 5V
● I/O Supply: 1.8V to 3.3V
● Digital Core Supply: 1.8V
● APPLICATIONS
● 3-Phase Power Monitors
● Defibrillators and ECG Monitors
● Coriolis Flow Meters
● Vibration/Modal Analysis
●PowerPAD is a trademark of Texas Instruments.
●SPI is a trademark of Motorola, Inc.
