16-Bit 2kSPS 8-Ch ADC With PGA, Reference, and IDAC for Precision Sensor Measurement - ADS1148

ADS1148 (ACTIVE)

16-Bit 2kSPS 8-Ch ADC With PGA, Reference, and IDAC for Precision Sensor Measurement

 

Recommended alternative parts

  • ADS114S08  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   ADS114S08 has more analog inputs (12), faster sample rate (4kSPS), lower power, smaller package + better VREF drift, OSC accuracy & IDAC matching

Description

The ADS1146, ADS1147, and ADS1148 devices are precision, 16-bit analog-to-digital converters (ADCs) that include many integrated features to reduce system cost and component count for sensor measurement applications. The devices feature a low-noise, programmable gain amplifier (PGA), a precision delta-sigma (ΔΣ) ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1147 and ADS1148 devices also provide a built-in, low-drift voltage reference, and two matched programmable excitation current sources (IDACs).

An input multiplexer supports four differential inputs for the ADS1148, two for the ADS1147, and one for the ADS1146. In addition, the multiplexer integrates sensor burn-out detection, voltage bias for thermocouples, system monitoring, and general purpose digital I/Os (ADS1147 and ADS1148). The PGA provides selectable gains up to 128 V/V. These features provide a complete front-end solution for temperature sensor measurement applications including thermocouples, thermistors, and resistance temperature detectors (RTDs) and other small signal measurements including resistive bridge sensors. The digital filter settles in a single cycle to support fast channel cycling when using the input multiplexer and provides 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

  • 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 (ADS1148) and
    4 (ADS1147) Independently Selectable Inputs
  • Programmable Gain: 1 V/V to 128 V/V
  • Dual-Matched Programmable Excitation Current Sources
  • Low-Drift Internal 2.048-V Reference
  • Sensor Burnout Detection
  • 4 or 8 General-Purpose I/Os (ADS1147 and ADS1148)
  • Internal Temperature Sensor
  • Power Supply and VREF Monitoring (ADS1147 and ADS1148)
  • Self and System Calibration
  • SPI™-Compatible Serial Interface
  • Analog Supply: Unipolar (2.7 V to 5.25 V) or Bipolar (±2.5 V)
  • Digital Supply: 2.7 V to 5.25 V

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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
Integrated Features
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Architecture
Operating Temperature Range (C)
Pin/Package
Reference Mode
ADS1148 ADS114S06 ADS114S08 ADS114S08B
16    16    16    16   
2kSPS    4kSPS    4kSPS    4kSPS   
8    6    12    12   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
Differential
Single-Ended   
2.3    1.75    1.75    1.75   
-2.125
0   
0    0    0   
2.125
4.25   
5.25    5.25    5.25   
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)
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   
2.7    2.7    2.7    2.7   
5.25    5.25    5.25    5.25   
Delta-Sigma    Delta-Sigma    Delta-Sigma    Delta-Sigma   
-40 to 105    -50 to 125    -50 to 125    -40 to 125   
28TSSOP
32VQFN   
32TQFP
32VQFN   
32TQFP
32VQFN   
32TQFP
32VQFN   
Ext
Int   
Ext
Int   
Ext
Int   
Ext
Int   

Other qualified versions of ADS1148

Version Part Number Definition
Automotive ADS1148-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

WEBENCH® Designer ADS1148

Sensor AFE Designer
 RTD
 Thermocouple
 Pressure
 Load
 Voltage Output