ADS1225 24-Bit, 100SPS ADC With Differential Input and Internal Oscillator | TI.com

ADS1225 (ACTIVE)

24-Bit, 100SPS ADC With Differential Input and Internal Oscillator

 

Description

The ADS1225 and ADS1226 are 24-bit delta-sigma analog-to-digital (A/D) converters. They offer excellent performance, ease-of-use, and low power in a small 4mm × 4mm QFN package and are well-suited for demanding high-resolution measurements, especially in portable and other space-saving and power-constrained applications.

The ADS1225 and ADS1226 convert on command using a dedicated START pin. Simply pulse this pin to initiate a conversion. Data is read in a single cycle for retrieval over a 2-wire serial interface that easily connects to popular microcontrollers like the MSP430. After the conversion completes, the ADS1225 and ADS1226 automatically shuts down all circuitry.

Internal features include a two-channel multiplexer (ADS1226), selectable input buffer, temperature sensor, and oscillator. The full-scale range is defined by the external voltage reference with support provided for up to a 5V differential input signal. Two operating modes allow for speed (100SPS data rate, 15µVRMS noise) or resolution (4µVRMS noise, 16SPS data rate).

The ADS1225/6 supports 2.7 to 5.5V analog and digital supplies. Power consumption is 1mW while converting with 3V supplies. The ADS1225 and ADS1226 are fully specified over an extended industrial temperature range of -40°C to +105°C.

Features

  • 100SPS Data Rate (High-Speed Mode)
  • Single-Cycle Settling
  • Easy Conversion Control with START Pin
  • Automatic Shutdown
  • Low Noise: 4µVRMS Noise (High-Resolution Mode)
  • Input Multiplexer with Two Differential Channels (ADS1226)
  • Voltage Reference Supports Ratiometric Measurements
  • Self-Calibrating
  • Simple Read-Only 2-Wire Serial Interface
  • Internal High-Impedance Input Buffer
  • Internal Temperature Sensor
  • Internal Oscillator
  • Low-Power: 1mW While Operating, < 1µA During Shutdown
  • Analog and Digital Supplies: 2.7V to 5.5V
  • APPLICATIONS
    • Hand-Held Instrumentation
    • Portable Medical Equipment
    • Industrial 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)
Rating
ADS1225 ADS1000 ADS1000-Q1 ADS1100 ADS1110 ADS1226
24     12     12     16     16     24    
0.1     0.128     0.128     0.128     0.128     0.1    
1     1     1     1     1     2    
SPI     I2C     I2C     I2C     I2C     SPI    
-40 to 105     -40 to 125     -40 to 125     -40 to 85     -40 to 125     -40 to 105    
VQFN | 16     SOT-23 | 6     SOT-23 | 6     SOT-23 | 6     SOT-23 | 6     VQFN | 16    
2.94 | 1ku     0.90 | 1ku     1.06 | 1ku     2.00 | 1ku     2.34 | 1ku     3.16 | 1ku    
1.6     0.21     0.21     0.27     0.72     1.6    
16VQFN: 16 mm2: 4 x 4 (VQFN | 16)     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)     6SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 6)     16VQFN: 16 mm2: 4 x 4 (VQFN | 16)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
   
   
   
   
   
Multiplexed    
Ext     Supply     Supply     Supply     Int     Ext    
Oscillator
Temp Sensor    
Oscillator
PGA
Small Size    
Oscillator
PGA
Small Size    
Oscillator
PGA
Small Size    
Oscillator
PGA
Small Size    
Oscillator
Temp Sensor    
5.5     5.5     5.5     5.5     5.5     5.5    
0     0     0     0     0     0    
2.7     2.7     2.7     2.7     2.7     2.7    
5.5     5.5     5.5     5.5     5.5     5.5    
2.7     2.7     2.7     2.7     2.7     2.7    
5.5     5.5     5.5     5.5     5.5     5.5    
335.5