(ACTIVE) 24-bit, 1kSPS, 4-ch general-purpose delta-sigma ADC with I2C interface and external Vref inputs


Functional Diagram


The ADS1219 is a precision, 24-bit, analog-to-digital converter (ADC) that includes all features necessary to implement the most common system monitoring functions, such as supply voltage, current, and temperature monitoring. The device features two differential or four single-ended inputs through a flexible input multiplexer (MUX), rail-to-rail input buffers, a programmable gain stage, a voltage reference, and an oscillator.

The device includes buffers that allow high-impedance sources to be directly connected to the device. A gain stage follows the buffers which provides selectable gains of 1 and 4. The ADS1219 can perform conversions at data rates as high as 1000 samples per second (SPS) with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50-Hz and 60-Hz rejection for noisy industrial applications.

The ADS1219 features a 2-wire, I2C-compatible interface that supports I2C bus speeds up to 1 Mbps. 16 different I2C addresses can be selected for the device via two address pins.

The ADS1219 is offered in a leadless 16-pin WQFN or a 16-pin TSSOP package and is specified over a temperature range of –40°C to +125°C.


  • Easy to Use With Only One Register to Program
  • Current Consumption as Low as 315 µA (typ)
  • Wide Supply Range: 2.3 V to 5.5 V
  • Rail-to-Rail Input Buffers to Achieve High Input Impedance
  • Programmable Gains: 1 and 4
  • Programmable Data Rates: Up to 1 kSPS
  • Up to 20 Bits Effective Resolution
  • Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS With Single-Cycle Settling Digital Filter
  • Two Differential or Four Single-Ended Inputs
  • Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
  • Internal 2% Accurate Oscillator
  • I2C-Compatible Interface
  • Supported I2C Bus Speed Modes:
    Standard-Mode, Fast-Mode, Fast-Mode Plus
  • 16 Pin-Configurable I2C Addresses
  • Package: 3.0-mm × 3.0-mm × 0.75-mm WQFN

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Resolution (Bits) 24    
Sample Rate (Max) (kSPS) 1    
Number of input channels 4    
Interface I2C    
Operating temperature range (C) -40 to 125    
Package Group TSSOP|16^WQFN|16    
Approx. price (US$) 2.95 | 1ku    
Power consumption (Typ) (mW) 1    
Package size: mm2:W x L (PKG) 16TSSOP: 22 mm2: 4.4 x 5 (TSSOP|16)^16WQFN: 9 mm2: 3 x 3 (WQFN|16)    
Architecture Delta-Sigma    
Input type Differential^Single-Ended    
Multi-channel configuration Multiplexed    
Reference mode Ext^Int    
Features 50/60 Hz Rejection^Oscillator^PGA    
Input range (Max) (V) 5.5    
Input range (Min) (V) 0    
Analog voltage AVDD (Min) (V) 2.3    
Analog voltage AVDD (Max) (V) 5.5    
Digital supply (Min) (V) 2.3    
Digital supply (Max) (V) 5.5    
Rating Catalog    

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