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

ADS1178 (ACTIVE)

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

Recommended alternative parts

  • ADS1174  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   4-channel equivalent device
  • ADS1274  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   24-bit 4-channel equivalent device
  • ADS1278  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   24-bit equivalent device
  • THS4521  -  1.14mA, rail to rail O/P fully differential ADC driver

Description

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.

Features

  • 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.

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Parametrics Compare all products in Precision ADC (<=10MSPS)

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Interface
SNR (dB)
Reference Mode
Architecture
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
Integrated Features
ADS1178 ADS1174 ADS1274 ADS1278
16     16     24     24    
52kSPS     52kSPS     144kSPS     144kSPS    
8     4     4     8    
Serial SPI     Serial SPI     Serial SPI     Serial SPI    
97     97     111     111    
Ext     Ext     Ext     Ext    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Catalog     Catalog     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 125     -40 to 105    
64HTQFP     64HTQFP     64HTQFP     64HTQFP    
8.00 | 1ku     6.00 | 1ku     14.65 | 1ku     25.15 | 1ku    
Simultaneous Sampling     Simultaneous Sampling     Simultaneous Sampling     Simultaneous Sampling    

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