16-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC with PGA & VREF for Small Signal Sensors - ADS1120

ADS1120 (ACTIVE)

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

 

Description

The ADS1120 is a precision, 16-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 ADS1120 ideally-suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and 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 ADS1120 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
  • 16-Bit Noise-Free Resolution at 20 SPS
  • 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:
    50 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

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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
ADS1120 ADS1147 ADS114S06 ADS114S06B
16    16    16    16   
2kSPS    2kSPS    4kSPS    4kSPS   
4    4    6    6   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
1.4    2.3    1.75    1.75   
-2.85
0   
-2.125
0   
0    0   
2.85
5.6   
2.125
4.25   
5.25    5.25   
SPI    SPI    SPI    SPI   
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   
2.3    2.7    2.7    2.7   
5.5    5.25    5.25    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 125    -40 to 105    -50 to 125    -40 to 125   
16TSSOP
16VQFN   
20TSSOP    32TQFP
32VQFN   
32TQFP
32VQFN   
Ext
Int
Supply   
Ext
Int   
Ext
Int   
Ext
Int   

Other qualified versions of ADS1120

Version Part Number Definition
Automotive ADS1120-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects