Overview
The ADS1247IPWR, produced by 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 is particularly suited for temperature sensor applications, including thermocouples, thermistors, and resistance temperature detectors (RTDs), as well as other small signal measurements such as resistive bridge sensors.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 Bits | |
| Data Rate | Up to 2 kSPS | SPS |
| Analog Supply Voltage | 2.7 V to 5.25 V (Unipolar), ±2.5 V (Bipolar) | V |
| Digital Supply Voltage | 2.7 V to 5.25 V | V |
| Operating Temperature | –40°C to 125°C | °C |
| PGA Gain | 1 to 128 | V/V |
| Noise (PGA = 128) | 48 nV RMS | nV RMS |
| Internal Reference Voltage | 2.048 V | V |
| Reference Drift | 10 ppm/°C (Maximum) | ppm/°C |
| Excitation Current Sources | 50, 100, 250, 500, 750, 1000, 1500 μA | μA |
Key Features
- Programmable data rates up to 2 kSPS with single-cycle settling for all data rates.
- Simultaneous 50-Hz and 60-Hz rejection at 20 SPS.
- Analog multiplexer with 4 independently selectable inputs.
- Low-noise PGA with gains up to 128.
- Dual-matched programmable excitation current sources (IDACs).
- Low-drift internal 2.048-V reference with 10-mA output capacity.
- Sensor burn-out detection and voltage bias for thermocouples.
- Internal temperature sensor and power supply and VREF monitoring.
- Self and system calibration capabilities.
- SPI™-compatible serial interface.
- General-purpose digital I/Os (4 or 8, depending on the model).
Applications
- Temperature sensor measurements: RTDs, thermocouples, and thermistors.
- Pressure measurements.
- Flow meters.
- Factory automation and process controls.
- Resistive bridge sensors and other small signal measurements.
Q & A
- What is the resolution of the ADS1247IPWR ADC?
The ADS1247IPWR has a resolution of 24 bits.
- What are the programmable data rates of the ADS1247IPWR?
The data rates are programmable up to 2 kSPS.
- What is the noise level of the PGA at a gain of 128?
The noise level is 48 nV RMS at PGA = 128.
- What is the internal reference voltage and its drift?
The internal reference voltage is 2.048 V with a maximum drift of 10 ppm/°C.
- What are the excitation current source settings?
The excitation current sources can be set to 50, 100, 250, 500, 750, 1000, and 1500 μA.
- Does the ADS1247IPWR support simultaneous 50-Hz and 60-Hz rejection?
- What is the operating temperature range of the ADS1247IPWR?
The operating temperature range is –40°C to 125°C.
- Does the ADS1247IPWR have an internal temperature sensor?
- What interface does the ADS1247IPWR use for communication?
The ADS1247IPWR uses an SPI™-compatible serial interface.
- What are some of the key applications of the ADS1247IPWR?
