Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converter - 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 (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
    • 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
Multi-Channel Configuration
Input Range (Min) (V)
Input Range (Max) (V)
Integrated Features
Analog Voltage AV/DD (Min) (V)
Analog Voltage AV/DD (Max) (V)
Operating Temperature Range (C)
Input Type
THD (Typ) (dB)
INL (Max) (+/-LSB)
SNR (dB)
Reference Mode
ADS1178 ADS1174 ADS1274 ADS1278
16     16     24     24    
52kSPS     52kSPS     144kSPS     144kSPS    
8     4     4     8    
Simultaneous Sampling       Simultaneous Sampling     Simultaneous Sampling    
0       0     0    
5.25       5.25     5.25    
Serial SPI     Serial SPI     Serial SPI     Serial SPI    
  Simultaneous Sampling     Daisy-Chainable     Daisy-Chainable    
4.75     4.75     4.75     4.75    
5.25     5.25     5.25     5.25    
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    
  Differential     Differential    
-105       -108     -108    
1     0.0045     201.4     201.4    
97     97     111     111    
Ext     Ext     Ext     Ext