24-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC with PGA & VREF for Small Signal Sensors - ADS1220

ADS1220 (ACTIVE)

24-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC with PGA & VREF for Small Signal Sensors

 

Description

The ADS1220 is a precision, 24-bit, analog-to-digital converter (ADC) that offers many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two differential or four single-ended inputs through a flexible input multiplexer (MUX), a low-noise, programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor.

The device can perform conversions at data rates up to 2000 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 internal PGA offers gains up to 128 V/V. This PGA makes the ADS1220 ideally-suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors. The device supports measurements of pseudo- or fully-differential signals when using the PGA. Alternatively, the device can be configured to bypass the internal PGA while still providing high input impedance and gains up to 4 V/V, allowing for single-ended measurements.

Power consumption is as low as 120 µA when operating in duty-cycle mode with the PGA disabled. The ADS1220 is offered in a leadless VQFN-16 or a TSSOP-16 package and is specified over a temperature range of –40°C to +125°C.

Features

  • Low Current Consumption:
    As Low as 120 µA (typ) in Duty-Cycle Mode
  • Wide Supply Range: 2.3 V to 5.5 V
  • Programmable Gain: 1 V/V to 128 V/V
  • Programmable Data Rates: Up to 2 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
  • Dual Matched Programmable Current Sources:
    10 µA to 1.5 mA
  • Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
  • Internal 2% Accurate Oscillator
  • Internal Temperature Sensor:
    0.5°C (typ) Accuracy
  • SPI-Compatible Interface (Mode 1)
  • Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN

View more

Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Type
Power Consumption (Typ) (mW)
Input Range (Min) (V)
Input Range (Max) (V)
Interface
Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
Reference Mode
ADS1220 ADS122C04 ADS122U04 ADS1247 ADS1248 ADS124S06 ADS124S08 ADS1262
24    24    24    24    24    24    24    32   
2kSPS    2kSPS    2kSPS    2kSPS    2kSPS    4kSPS    4kSPS    38kSPS   
4    4    4    4    8    6    12    10   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
1.4    1.4    1.4    2.3    2.3    1.75    1.75    27   
-2.85
0   
-2.85
0   
-2.85
0   
-2.125
0   
-2.125
0   
0    0    -2.5
0   
2.85
5.6   
2.85
5.6   
2.85
5.6   
2.125
4.25   
2.125
4.25   
5.25    5.25    2.5
5   
SPI    I2C    UART    SPI    SPI    SPI    SPI    SPI   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
2.3    2.3    2.3    2.7    2.7    2.7    2.7    4.75   
5.5    5.5    5.5    5.25    5.25    5.25    5.25    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 125    -40 to 125    -40 to 125    -40 to 105    -40 to 105    -50 to 125    -50 to 125    -40 to 125   
16TSSOP
16VQFN   
16TSSOP
16WQFN   
16TSSOP
16WQFN   
20TSSOP    28TSSOP    32TQFP
32VQFN   
32TQFP
32VQFN   
28TSSOP   
Ext
Int
Supply   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   

WEBENCH® Designer ADS1220

Sensor AFE Designer
 RTD
 Thermocouple
 Load