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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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)
THD (Typ) (dB)
Rating
ADS1251 ADS1250 ADS1252 ADS1253 ADS1254 ADS1258
24     20     24     24     24     24    
20     25     41     20     20     125    
1     1     1     4     4     16    
SPI     SPI     SPI     SPI     SPI     SPI    
-40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 105    
SOIC | 8     SOIC | 16     SOIC | 8     SSOP | 16     SSOP | 20     VQFN | 48    
5.99 | 1ku     10.38 | 1ku     6.45 | 1ku     8.40 | 1ku     7.17 | 1ku     10.44 | 1ku    
7.5     75     40     7.5     4.3     42    
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)     16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)     8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)     16SSOP: 29 mm2: 6 x 4.9 (SSOP | 16)     20SSOP: 52 mm2: 6 x 8.65 (SSOP | 20)     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential     Differential
Single-Ended    
Differential     Differential     Differential     Differential
Single-Ended    
   
   
   
Multiplexed     Multiplexed     Multiplexed    
Ext     Ext     Ext     Ext     Ext     Ext    
50/60 Hz Rejection     PGA     50/60 Hz Rejection     50/60 Hz Rejection     50/60 Hz Rejection     GPIO
Oscillator    
5.25     4.196     5.25     5.25     5.25     2.85
5.35    
0     0     0     0     0     -2.7
0    
4.75     4.75     4.75     4.75     4.75     4.75    
5.25     5.25     5.25     5.25     5.25     5.25    
4.75     4.75     4.75     4.75     1.8     2.7    
5.25     5.25     5.25     5.25     3.6     5.25