ADS1258 24-bit, 125kSPS, 16-ch delta-sigma ADC with fast channel scan and automatic sequencer | TI.com

ADS1258 (ACTIVE) 24-bit, 125kSPS, 16-ch delta-sigma ADC with fast channel scan and automatic sequencer

24-bit, 125kSPS, 16-ch delta-sigma ADC with fast channel scan and automatic sequencer - ADS1258
Datasheet
 

Description

The ADS1258 is a 16-channel (multiplexed), low-noise, 24-bit, delta-sigma () 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 prior to 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 ADS1258 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 ADS1258 is available in a QFN-48 package.

Features

  • 24 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
  • Low Noise: 2.8µVRMS at 1.8kSPS
  • 0.0003% Integral Nonlinearity
  • DC Stability (typical):
    0.02µV/°C Offset Drift, 0.4ppm/°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
  • 8 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.

WEBENCH® Designer ADS1258



Parametrics

Compare all products in Precision ADCs (<=10MSPS) Email Download to Excel
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) THD (Typ) (dB) Rating
ADS1258 Order now 24     125     16     SPI     -40 to 105     VQFN | 48     10.44 | 1ku     42     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext     GPIO
Oscillator    
2.85
5.35    
-2.7
0    
4.75     5.25     2.7     5.25         Catalog    
ADS1158 Order now 16     125     16     SPI     -40 to 105     VQFN | 48     5.95 | 1ku     42     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext     GPIO
Oscillator    
2.85
5.35    
-2.7
0    
4.75     5.25     2.5     3.6     1       Catalog    
ADS1250 Samples not available 20     25     1     SPI     -40 to 85     SOIC | 16     10.38 | 1ku     75     16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)     Delta-Sigma     Differential
Single-Ended    
   
Ext     PGA     4.196     0     4.75     5.25     4.75     5.25     21     -97     Catalog    
ADS1251 Order now 24     20     1     SPI     -40 to 85     SOIC | 8     5.99 | 1ku     7.5     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     Delta-Sigma     Differential    
   
Ext