24-Bit, 2kSPS, 8-Ch, Delta-Sigma ADC for Precision Sensor Measurement - ADS1248

ADS1248 (ACTIVE)

24-Bit, 2kSPS, 8-Ch, Delta-Sigma ADC for Precision Sensor Measurement

 

Recommended alternative parts

  • ADS124S08  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   ADS124S08 has more analog inputs (12), faster sample rate (4kSPS), lower noise, lower power, smaller package + better VREF drift, OSC accuracy & IDAC matching

Description

The ADS1246, ADS1247, and ADS1248 are highly-integrated, precision, 24-bit analog-to-digital converters (ADCs). The devices feature an onboard, low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1247 and ADS1248 also provide a built-in, very low drift voltage reference with 10-mA output capacity, and two matched programmable current digital-to-analog converters (DACs). The devices provide a complete front-end solution for temperature sensor applications including thermal couples, thermistors, and resistance temperature detectors (RTDs).

An input multiplexer supports four differential inputs for the ADS1248, two for the ADS1247, and one for the ADS1246. In addition, the multiplexer has a sensor burn-out detect, voltage bias for thermocouples, system monitoring, and general-purpose digital I/Os (ADS1247 and ADS1248). The onboard, low-noise PGA provides selectable gains of 1 to 128. The ΔΣ modulator and adjustable digital filter settle in only one cycle, for fast channel cycling when using the input multiplexer, and support data rates up to 2 kSPS. For data rates of 20 SPS or less, both 50-Hz and 60-Hz interference are rejected by the filter.

Features

  • 24 Bits, No Missing Codes
  • Programmable Data Rates Up to 2 kSPS
  • Single-Cycle Settling for All Data Rates
  • Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS
  • Analog Multiplexer With 8 (ADS1248) and 4
    (ADS1247) Independently Selectable Inputs
  • Low-Noise PGA: 48 nVRMS at PGA = 128
  • Dual-Matched Programmable Excitation Current Sources
  • Low-Drift Internal 2.048-V Reference:
    10 ppm/°C (Maximum)
  • Sensor Burn-Out Detection
  • 4 or 8 General-Purpose I/Os (ADS1247, ADS1248)
  • Internal Temperature Sensor
  • Power Supply and VREF Monitoring (ADS1247, ADS1248)
  • Self and System Calibration
  • SPI™-Compatible Serial Interface
  • Analog Supply: Unipolar (2.7 V to 5.25 V) and Bipolar (±2.5 V) Operation
  • Digital Supply: 2.7 V to 5.25 V
  • Operating Temperature –40°C to 125°C
  • APPLICATIONS
    • Temperature Sensor Measurements:
      • RTDs, Thermocouples, and Thermistors
    • Pressure Measurements
    • Flow Meters
    • Factory Automation and Process Controls

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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
ADS1248 ADS1220 ADS124S08 ADS1262
24    24    24    32   
2000    2000    4000    38000   
8    4    12    10   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
2.3    1.4    1.75    27   
-2.125
0   
-2.85
0   
-2.625
0   
-2.5
0   
2.125
4.25   
2.85
5.6   
2.625
5.25   
2.5
5   
SPI    SPI    SPI    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)
GPIO
Oscillator
PGA
Temp Sensor   
50/60 Hz Rejection
Excitation Current Sources (iDACs)
GPIO
Oscillator
PGA
Temp Sensor   
2.7    2.3    2.7    4.75   
5.25    5.5    5.25    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 105    -40 to 125    -50 to 125    -40 to 125   
28TSSOP    16TSSOP
16VQFN   
32TQFP
32VQFN   
28TSSOP   
Ext
Int   
Ext
Int
Supply   
Ext
Int   
Ext
Int   

WEBENCH® Designer ADS1248

Sensor AFE Designer
 RTD
 Thermocouple
 Pressure
 Load
 Voltage Output