ADS1158 16-Bit, 125kSPS, 16-Ch Delta-Sigma ADC w/ Fast Channel Scan & Automatic Sequencer | TI.com

ADS1158 (ACTIVE)

16-Bit, 125kSPS, 16-Ch Delta-Sigma ADC w/ Fast Channel Scan & Automatic Sequencer

16-Bit, 125kSPS, 16-Ch Delta-Sigma ADC w/ Fast Channel Scan & Automatic Sequencer - ADS1158
Datasheet
 

Description

The ADS1158 is a 16-channel (multiplexed), low-noise, 16-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) that provides single-cycle settled data at channel scan rates from 1.8k to 23.7k samples per second (SPS) per channel. A flexible input multiplexer accepts combinations of eight differential or 16 single-ended inputs with a full-scale differential range of 5V or true bipolar range of ±2.5V when operating with a 5V reference. The fourth-order delta-sigma modulator is followed by a fifth-order sinc digital filter optimized for low-noise performance.

The differential output of the multiplexer is accessible to allow signal conditioning before the input of the ADC. Internal system monitor registers provide supply voltage, temperature, reference voltage, gain, and offset data.

An onboard PLL generates the system clock from a 32.768kHz crystal, or can be overridden by an external clock source. A buffered system clock output (15.7MHz) is provided to drive a microcontroller or additional converters.

Serial digital communication is handled via an SPI™-compatible interface. A simple command word structure controls channel configuration, data rates, digital I/O, monitor functions, etc.

Programmable sensor bias current sources can be used to bias sensors or verify sensor integrity.

The ADS1158 operates from a unipolar +5V or bipolar ±2.5V analog supply and a digital supply compatible with interfaces ranging from 2.7V to 5.25V. The ADS1158 is available in a QFN-48 package.

Features

  • 16 Bits, No Missing Codes
  • Fixed-Channel or Automatic Channel Scan
  • Fixed-Channel Data Rate: 125kSPS
  • Auto-Scan Data Rate: 23.7kSPS/Channel
  • Single-Conversion Settled Data
  • 16 Single-Ended or 8 Differential Inputs
  • Unipolar (+5V) or Bipolar (±2.5V) Operation
  • 0.3LSB (INL)
  • DC Stability:
    1µV/°C Offset Drift, 2ppm/°C Gain Drift
  • Open-Sensor Detection
  • Conversion Control Pin
  • Multiplexer Output for External Signal Conditioning
  • On-Chip Temperature, Reference, Offset, Gain, and Supply Voltage Readback
  • 42mW Power Dissipation
  • Standby, Sleep, and Power-Down Modes
  • Eight General-Purpose Inputs/Outputs (GPIO)
  • 32.768kHz Crystal Oscillator or External Clock
  • APPLICATIONS
    • Medical, Avionics, and Process Control
    • Machine and System Monitoring
    • Fast Scan Multi-Channel Instrumentation
    • Industrial Systems
    • Test and Measurement Systems

    SPI is a trademark of Motorola, Inc.
    All other trademarks are the property of their respective owners.

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

     
    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)
    Rating
    ADS1158 ADS1258
    16     24    
    125     125    
    16     16    
    SPI     SPI    
    -40 to 105     -40 to 105    
    VQFN | 48     VQFN | 48    
    5.95 | 1ku     10.44 | 1ku    
    42     42    
    48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)    
    Delta-Sigma     Delta-Sigma    
    Differential
    Single-Ended    
    Differential
    Single-Ended    
    Multiplexed     Multiplexed    
    Ext     Ext    
    GPIO
    Oscillator    
    GPIO
    Oscillator    
    2.85
    5.35    
    2.85
    5.35    
    -2.7
    0    
    -2.7
    0    
    4.75     4.75    
    5.25     5.25    
    2.5     2.7    
    3.6     5.25    
    1      
    Catalog     Catalog