ADS1220 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface | TI.com

ADS1220 (ACTIVE)

24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface

 

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

WEBENCH® Designer ADS1220

Sensor AFE Designer
 RTD
 Thermocouple
 Load

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) Rating
ADS1220 Order now 24     2     4     SPI     -40 to 125     TSSOP | 16
VQFN | 16    
3.95 | 1ku     1.4     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
16VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 16)    
Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int
Supply    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
Oscillator
PGA
Temp Sensor    
2.85
5.6    
-2.85
0    
2.3     5.5     2.3     5.5     Catalog    
ADS122C04 Order now 24     2     4     I2C     -40 to 125     TSSOP | 16
WQFN | 16    
3.95 | 1ku     1.4     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
Oscillator
PGA
Temp Sensor
Small Size    
2.85
5.6    
-2.85
0    
2.3     5.5     2.3     5.5     Catalog    
ADS122U04 Order now 24     2     4     UART     -40 to 125     TSSOP | 16
WQFN | 16    
3.95 | 1ku     1.4     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
16WQFN: 9 mm2: 3 x 3 (WQFN | 16)    
Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor
Small Size    
2.85
5.6    
-2.85
0    
2.3     5.5     2.3     5.5     Catalog    
ADS1247 Order now 24     2     4     SPI     -40 to 105     TSSOP | 20     4.45 | 1ku     2.3     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)     Delta-Sigma     Differential
Single-Ended    
Multiplexed     Ext
Int    
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor    
2.125
4.25    
-2.125
0    
2.7     5.25