Δ-Σ ADC
Δ-Σ ADC
Leveraging our unique low-power architecture and patents, we offer ultra-low-power CMOS Hall sensors. With high signal-to-noise ratio signal reconstruction technology, we also provide ultra-high sensitivity magnetic field sampling products.
Product Model
DADS1248
The DADS1248 is a precision 24-bit analog-to-digital converter (ADC) that includes numerous integrated features to reduce system cost and component count for sensor measurement applications. This chip features a low-noise programmable gain amplifier (PGA), a single-cycle digital filter, a high-precision Delta-Sigma (ΔΣ) A/D converter, and an internal oscillator. The DADS1248 also provides a built-in, low-drift reference voltage and two matched programmable excitation current sources (IDACs). The DADS1248's input analog multiplexer supports four differential inputs. Furthermore, this multiplexer integrates sensor failure detection, thermocouple voltage biasing, system monitoring, and general-purpose digital I/O.
The programmable gain amplifier (PGA) offers selectable gain up to 128x. These features provide a complete front-end solution for temperature sensor measurement applications, including thermocouples, thermistors, and resistance temperature detectors (RTDs), as well as other small-signal measurements including resistance bridge sensors. The digital filter enables single-cycle setup to support fast channel cycling when using the input multiplexer and provides data rates up to 2kSPS. For data rates of 20 SPS or lower, the filter will suppress power frequency interference at 50Hz and 60Hz.
Features
- Programmable data rate: up to 2kSPS.
- Single-cycle setup for all data rates.
- Achieve 50Hz and 60Hz harmonic suppression at 20SPS.
- Analog multiplexer with 8 independently selectable inputs.
- Low-noise programmable gain amplifier: 48nVRMS when PGA=128.
- Two matched programmable excitation current sources.
- Integrated low-drift 2.048V reference voltage: 10ppm/°C.
- Sensor failure detection.
- 8 general purpose input /output interfaces.
- Built-in temperature sensor:
- Power supply and reference voltage monitoring.
- Self-calibration and system calibration.
- SPI interface compatible.
- Analog power supply: unipolar (2.7V) to 5.25V) and bipolar (±2.5V) operating voltage.
- Digital power supply: 2.7V to 5.25V.
Applications
- Temperature sensor measurement:
- Resistance temperature detectors (RTDs), thermocouples and thermistors
- Pressure measurement
- Flow meter
- Factory automation and process control
Specifications
Product Model | Resolution (bits) | Sampling Rate | Channels | ENOB | Power Dissipation (mw) | Temperature Range (°C) | Package Type | Datasheet |
|---|---|---|---|---|---|---|---|---|
DADS1248 | 24 | 2ksps | 8 | 19.5 | 1.4 | -40°C ~ 85°C | SSOP-28 |
