24-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC With PGA, Voltage Reference, IDACs and UART Interface - ADS122U04

ADS122U04 (ACTIVE)

24-Bit, 2kSPS, 4-Ch, Low-Power Delta-Sigma ADC With PGA, Voltage Reference, IDACs and UART Interface

 

Description

The ADS122U04 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, 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. This PGA makes the ADS122U04 ideally suited for applications measuring small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors.

The ADS122U04 features a 2-wire, UART-compatible interface. In applications that require galvanic isolation this universal asynchronous receiver/transmitter (UART) interface minimizes the number of digital isolation channels, thus saving cost, board space, and power.

The ADS122U04 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.

Features

  • Current Consumption as Low as 315 µA (typ)
  • Wide Supply Range: 2.3 V to 5.5 V
  • Programmable Gain: 1 to 128
  • 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
  • Three General-Purpose Inputs/Outputs
  • 2-Wire UART Compatible Interface (8-N-1 Format) With Baud Rates up to 120 kBaud and
    Auto-Baud-Rate Detection
  • Package: 3.0-mm × 3.0-mm × 0.75-mm WQFN

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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
ADS122U04 ADS1220 ADS122C04 ADS1247
24    24    24    24   
2kSPS    2kSPS    2kSPS    2kSPS   
4    4    4    4   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
1.4    1.4    1.4    2.3   
-2.85
0   
-2.85
0   
-2.85
0   
-2.125
0   
2.85
5.6   
2.85
5.6   
2.85
5.6   
2.125
4.25   
UART    SPI    I2C    SPI   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
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   
2.3    2.3    2.3    2.7   
5.5    5.5    5.5    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 125    -40 to 125    -40 to 125    -40 to 105   
16TSSOP
16WQFN   
16TSSOP
16VQFN   
16TSSOP
16WQFN   
20TSSOP   
Ext
Int   
Ext
Int
Supply   
Ext
Int   
Ext
Int   

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