ADS1120 (ACTIVE)

16-Bit 2kSPS 4-Ch Low-Power Delta-Sigma ADC With PGA and VREF for Small Signal Sensors

16-Bit 2kSPS 4-Ch Low-Power Delta-Sigma ADC With PGA and VREF for Small Signal Sensors - ADS1120
 

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

View more

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

 
Resolution (Bits)
Sample Rate (Max) (kSPS)
# 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
Sample Rate (Max) (MSPS)
ADS1120 ADS112C04 ADS112U04 ADS1147 ADS114S06 ADS114S06B
16    16    16    16    16    16   
2    4    2    2    4    4   
4    4    4    4    6    6   
SPI    I2C    UART    SPI    SPI    SPI   
-40 to 125    -40 to 125    -40 to 125    -40 to 105    -50 to 125    -40 to 125   
TSSOP
VQFN   
TSSOP
WQFN   
TSSOP
WQFN   
TSSOP    TQFP
VQFN   
TQFP
VQFN   
3.15 | 1ku      3.15 | 1ku    3.45 | 1ku    3.85 | 1ku    3.55 | 1ku   
1.4    1.4    1.4    2.3    1.75    1.75   
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)
16VQFN: 12 mm2: 3.5 x 3.5(VQFN)   
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)
16WQFN: 9 mm2: 3 x 3(WQFN)   
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)
16WQFN: 9 mm2: 3 x 3(WQFN)   
20TSSOP: 42 mm2: 6.4 x 6.5(TSSOP)    32TQFP: 49 mm2: 7 x 7(TQFP)
32VQFN: 25 mm2: 5 x 5(VQFN)   
32TQFP: 49 mm2: 7 x 7(TQFP)
32VQFN: 25 mm2: 5 x 5(VQFN)   
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    Multiplexed    Multiplexed    Multiplexed    Multiplexed    Multiplexed   
Ext
Int
Supply   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   
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   
2.85
5.6   
  2.85
5.6   
2.125
4.25   
2.625
5.25   
2.625
5.25   
-2.85
0   
  -2.85
0   
-2.125
0   
-2.625
0   
-2.625
0   
2.3    -2.5
2.3   
2.3    2.7    2.7    2.7   
5.5    2.5
5.5   
5.5    5.25    5.25    5.25   
2.3    -2.5
2.3   
2.3    2.7    2.7    2.7   
5.5    2.5
5.5   
5.5    5.25    3.6    3.6   
1.3        1    1    1   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
0.002    0.004    0.002    0.002    0.004    0.004   

Other qualified versions of ADS1120

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