The ADS124S06 and ADS124S08 are precision, 24-bit, delta-sigma (ΔΣ), analog-to-digital converters (ADCs) that offer low power consumption and many integrated features to reduce system cost and component count in applications measuring smallsignal sensors.
These ADCs feature configurable digital filters that offer low-latency conversion results and 50-Hz or 60-Hz rejection for noisy industrial environments. A low-noise, programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify lowlevel signals for resistive bridge or thermocouple applications. Additionally, these devices integrate a low-drift, 2.5-V reference that reduces printed circuit board (PCB) area. Finally, two programmable excitation current sources (IDACs) allow for easy and accurate RTD biasing.
An input multiplexer supports 12 inputs for the ADS124S08 and six inputs for the ADS124S06 that can be connected to the ADC in any combination for design flexibility. In addition, these devices include features such as sensor burn-out detection, voltage bias for thermocouples, system monitoring, and four general-purpose I/Os.
The devices are offered in a leadless VQFN-32 or a TQFP-32 package.
Four General-Purpose I/Os
Digital Supply: 2.7 V to 3.6 V
Programmable Gain: 1 to 128
Internal Temperature Sensor
Extended Fault Detection Circuits
Self Offset and System Calibration
SPI-Compatible Interface with Optional CRC
Operating Temperature: –50°C to +125°C
1• Low Power Consumption: As Low as 280 µA
Low-Noise PGA: 19 nVRMS at Gain = 128
Programmable Data Rates: 2.5 SPS to 4 kSPS
Internal Oscillator: 4.096 MHz, 1.5% Accuracy
Analog Supply: Unipolar (2.7 V to 5.25 V) or Bipolar (±2.5 V)
Simultaneous 50-Hz and 60-Hz Rejection at≤ 20 SPS with Low-Latency Digital Filter
Analog Multiplexer with 12 (ADS124S08) or 6 (ADS124S06) Independently Selectable Inputs
Dual-Matched Programmable Current Sources for Sensor Excitation: 10 µA to 2000 µA • Internal Reference: 2.5 V, 10 ppm/°C (max) Drift
PLC and DCS Analog Input Modules
Climate Chambers, Industrial Ovens
Sensor Transducers and Transmitters:Temperature, Pressure, Strain, Flow