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 ADCs (<=10MSPS)

Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Integrated Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Operating Temperature Range (C)
THD (Typ) (dB)
SNR (dB)
Reference Mode
ADS1178 ADS1174 ADS1274 ADS1278
16    16    24    24   
52kSPS    52kSPS    144kSPS    144kSPS   
8    4    4    8   
Differential    Differential   
245    135    275    530   
0    0    0    0   
5.25    5.25    5.25    5.25   
SPI    SPI    SPI    SPI   
Daisy-Chainable    Daisy-Chainable    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   
-40 to 85    -40 to 85    -40 to 125    -40 to 105   
64HTQFP    64HTQFP    64HTQFP    64HTQFP   
-105      -108    -108   
97    97    111    111   
Ext    Ext    Ext    Ext   

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