Overview
The ADS1231IDR, produced by Texas Instruments, is a precision 24-bit analog-to-digital converter (ADC) designed specifically for bridge sensor applications. This device integrates a low-noise programmable gain amplifier (PGA), an internal oscillator, a third-order delta-sigma (ΔΣ) modulator, and a fourth-order digital filter. It provides a complete front-end solution for measuring signals from bridge sensors, including weigh scales, strain gauges, and pressure sensors. The ADS1231IDR is known for its high accuracy, low noise, and robust rejection of 50Hz and 60Hz line-cycle interference, making it an ideal choice for precise measurement applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Resolution | - | 24 Bits | - | - |
| Data Rate | - | 10 SPS or 80 SPS | - | - |
| Full-scale Input Voltage (AINP - AINN) | ±11.7 mV (VREF = 3V) | ±19.5 mV (VREF = 5V) | - | mV |
| Common-mode Input Range | GND + 1.5 | - | AVDD - 1.5 | V |
| On-resistance (RON) of Low-side Power Switch | 3.5 Ω (AVDD = 5V) | 5 Ω (AVDD = 5V) | 7 Ω (AVDD = 3V) | Ω |
| Power-supply Voltage (AVDD, DVDD) | 3 | - | 5.3 | V |
| Analog Supply Current (Normal Mode) | - | 900 μA (AVDD = 3V or 5V) | - | μA |
| Digital Supply Current (Normal Mode) | - | 60 μA (DVDD = 3V), 95 μA (DVDD = 5V) | - | μA |
| Temperature Range | -40°C | - | +85°C | °C |
| Package | - | SOIC-16 | - | - |
Key Features
- Complete Front-End for Bridge Sensors: Includes a low-noise PGA, internal oscillator, third-order ΔΣ modulator, and fourth-order digital filter.
- Low Noise: 35nVrms noise performance.
- Selectable Data Rates: 10SPS or 80SPS with simultaneous 50Hz and 60Hz rejection at 10SPS.
- Internal Amplifier: Gain of 128.
- Low-Side Power Switch: For bridge sensor power management.
- External Voltage Reference: Up to 5V for ratiometric measurements.
- Simple, Pin-Driven Control: No digital registers to program.
- Two-Wire Serial Digital Interface: Easy data retrieval.
Applications
- Weigh scales
- Strain gauges
- Pressure sensors
- Load cells
Q & A
- What is the resolution of the ADS1231IDR? The ADS1231IDR has a 24-bit resolution.
- What are the available data rates for the ADS1231IDR? The data rates are 10 SPS and 80 SPS.
- What is the full-scale input voltage range for the ADS1231IDR? The full-scale input voltage range is ±19.5 mV when VREF = 5V and ±11.7 mV when VREF = 3V.
- How does the ADS1231IDR manage power for bridge sensors? It includes a low-side power switch to manage power for the bridge sensor.
- What is the temperature range of the ADS1231IDR? The temperature range is from -40°C to +85°C.
- What type of package is the ADS1231IDR available in? The ADS1231IDR is available in a SOIC-16 package.
- How is data retrieved from the ADS1231IDR? Data is retrieved through a simple two-wire serial digital interface.
- Does the ADS1231IDR require any digital register programming? No, the ADS1231IDR does not require any digital register programming; all control is accomplished through dedicated pins.
- What is the noise performance of the ADS1231IDR? The noise performance is 35nVrms.
- Can the ADS1231IDR be put into a low-power mode? Yes, the ADS1231IDR can be put into a standby mode or a power-down mode to reduce power consumption.
