Overview
The ADS1248IPW from Texas Instruments is a highly-integrated, precision 24-bit analog-to-digital converter (ADC) designed for precision sensor measurements. This device features 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. It provides a complete front-end solution for various sensor applications, including temperature sensors such as thermocouples, thermistors, and resistance temperature detectors (RTDs).
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 bits |
| Sample Rate | Up to 2 kSPS |
| Number of Channels | 8 (independently selectable inputs) |
| Package | TSSOP (PW) with 28 pins |
| Operating Temperature Range | -40°C to 125°C |
| Analog Supply Voltage | Unipolar (2.7 V to 5.25 V), Bipolar (±2.5 V) |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| PGA Noise | 48 nV RMS at PGA = 128 |
| Internal Reference | 2.048 V, 10 ppm/°C (Maximum) |
Key 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 independently selectable inputs
- Low-noise PGA with selectable gains of 1 to 128
- Dual-matched programmable excitation current sources
- Low-drift internal 2.048-V reference
- Sensor burn-out detection
- Internal temperature sensor
- Power supply and VREF monitoring
- Self and system calibration
- SPI™-compatible serial interface
- General-purpose digital I/Os (4 or 8)
Applications
- Temperature sensor measurements: RTDs, thermocouples, and thermistors
- Pressure measurements
- Flow meters
- Factory automation and process controls
Q & A
- What is the resolution of the ADS1248IPW?
The ADS1248IPW has a resolution of 24 bits.
- What are the programmable data rates of the ADS1248IPW?
The device supports programmable data rates up to 2 kSPS.
- How many channels does the ADS1248IPW have?
The ADS1248IPW has 8 independently selectable inputs.
- What is the operating temperature range of the ADS1248IPW?
The operating temperature range is -40°C to 125°C.
- What are the supply voltage ranges for the ADS1248IPW?
The analog supply voltage can be unipolar (2.7 V to 5.25 V) or bipolar (±2.5 V), and the digital supply voltage is 2.7 V to 5.25 V.
- Does the ADS1248IPW have internal temperature sensing capabilities?
- What kind of noise performance does the PGA of the ADS1248IPW have?
The PGA has a noise performance of 48 nV RMS at PGA = 128.
- Does the ADS1248IPW support simultaneous 50-Hz and 60-Hz rejection?
- What types of sensors can the ADS1248IPW measure?
The device is suitable for measuring temperature sensors such as RTDs, thermocouples, and thermistors, as well as pressure and flow measurements.
- Does the ADS1248IPW have self and system calibration capabilities?
