ADS1251 24-Bit, 20kHz, Low-Power Analog-to-Digital Converter | TI.com

ADS1251 (ACTIVE) 24-Bit, 20kHz, Low-Power Analog-to-Digital Converter

 

Description

The ADS1251 is a precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution operating from a single +5V supply. The delta-sigma architecture is used for wide dynamic range and to guarantee 24 bits of no missing codes performance. Effective resolution of 19 bits (1.5ppm of rms noise) is achieved for conversion rates up to 20kHz.

The ADS1251 is designed for high-resolution measurement applications in cardiac diagnostics, smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation. The converter includes a flexible, 2-wire synchronous serial interface for low-cost isolation.

The ADS1251 is a single-channel converter and is offered in an SO-8 package. It is pin-compatible with the faster ADS1252 (41.7kHz data rate).

Features

  • 24 BITS—NO MISSING CODES
  • 19 BITS EFFECTIVE RESOLUTION UP TO 20kHz DATA RATE
  • LOW NOISE: 1.5ppm
  • DIFFERENTIAL INPUTS
  • INL: 15ppm (max)
  • EXTERNAL REFERENCE (0.5V to 5V)
  • POWER-DOWN MODE
  • SYNC MODE
  • LOW POWER:
    8mW at 20kHz
    5mW at 10kHz
  • APPLICATIONS
    • CARDIAC DIAGNOSTICS
    • DIRECT THERMOCOUPLE INTERFACES
    • BLOOD ANALYSIS
    • INFRARED PYROMETERS
    • LIQUID/GAS CHROMATOGRAPHY
    • PRECISION PROCESS CONTROL

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WEBENCH® Designer ADS1251



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) THD (Typ) (dB) Rating
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     50/60 Hz Rejection     5.25     0     4.75     5.25     4.75     5.25     251.7     -105     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    
ADS1252 Order now 24     41     1     SPI     -40 to 85     SOIC | 8     6.45 | 1ku     40     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     Delta-Sigma     Differential    
   
Ext     50/60 Hz Rejection     5.25     0     4.75     5.25     4.75     5.25     251.7     -97     Catalog    
ADS1253 Samples not available 24     20     4     SPI     -40 to 85     SSOP | 16     8.40 | 1ku     7.5     16SSOP: 29 mm2: 6 x 4.9 (SSOP | 16)     Delta-Sigma     Differential     Multiplexed     Ext