ADS1178 - Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converter

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 (1LSB_PP). 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.

Products containing the "ADS1178" keyword are: ADS1178 , ADS1178EVM , ADS1178EVM-PDK , ADS1178IPAPR , ADS1178IPAPR , ADS1178IPAPR G4 , ADS1178IPAPRG4 , ADS1178IPAPRT , ADS1178IPAPT , ADS1178IPAPT , ADS1178IPAPTG4 , ADS1178IPAPTG4

• 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.