ADS1178 Octal, Simultaneous Sampling, 16-Bit Analog-to-Digital Converter | TI.com

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

 

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.

Parametrics

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Part number Order Resolution (Bits) Sample rate (Max) (kSPS) Number of input channels Interface Operating temperature range (C) Package Group Approx. price (US$) Power consumption (Typ) (mW) Package size: mm2:W x L (PKG) Architecture Input type Multi-channel configuration Reference mode Features Input range (Max) (V) Input range (Min) (V) Analog voltage AVDD (Min) (V) Analog voltage AVDD (Max) (V) Digital supply (Min) (V) Digital supply (Max) (V) INL (Max) (+/-LSB) SNR (dB) THD (Typ) (dB) Rating
ADS1178 Order now 16     52     8     SPI     -40 to 85     HTQFP | 64     8.80 | 1ku     245     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential
Single-Ended    
Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     1.95     1     97     -105     Catalog    
ADS1174 Samples not available 16     52     4     SPI     -40 to 85     HTQFP | 64     6.30 | 1ku     135     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential
Single-Ended    
Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     1.95     0.0045     97     -105     Catalog    
ADS1274 Order now 24     144     4     SPI     -40 to 125     HTQFP | 64     14.65 | 1ku     275     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma     Differential     Simultaneous Sampling     Ext     Daisy-Chainable     5.25     0     4.75     5.25     1.65     2.2       111     -108     Catalog    
ADS1278 Order now 24     144     8     SPI     -40 to 105     HTQFP | 64     25.15 | 1ku     530     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)     Delta-Sigma