Overview
The ADS1231ID from Texas Instruments is a precision 24-bit analog-to-digital converter (ADC) designed specifically for bridge sensor applications. This device integrates a complete front-end solution, including a low-noise programmable gain amplifier (PGA), an internal oscillator, a third-order delta-sigma (ΔΣ) modulator, and a fourth-order digital filter. It is ideal for use in weigh scales, strain gauges, and pressure sensors. The ADS1231ID operates over a supply voltage range of 3V to 5.3V and is housed in a 16-pin SOIC package, making it a compact and versatile solution for various industrial and measurement applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 Bits | |
| Data Rates | 10 SPS or 80 SPS | |
| Supply Voltage (AVDD, DVDD) | 3 to 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 to +85°C | °C |
| Full-scale Input Voltage (AINP – AINN) | ±19.5 mV (VREF = AVDD = 5V), ±11.7 mV (VREF = AVDD = 3V) | mV |
| On-resistance (RON) of Low-Side Power Switch | 3.5 to 5 Ω (AVDD = 5V), 4 to 7 Ω (AVDD = 3V) | Ω |
| Noise Performance (RMS Noise at 10 SPS) | 35.2 nV (AVDD = 5V) | nV |
Key Features
- Complete Front-End for Bridge Sensors: Includes an internal low-noise PGA with a gain of 128, an internal oscillator, and a bridge power switch.
- Low Noise: Offers 35nVrms noise performance, ensuring high accuracy in measurements.
- Selectable Data Rates: Supports data rates of 10 SPS and 80 SPS, with simultaneous 50Hz and 60Hz rejection at 10 SPS.
- Internal Oscillator and Digital Filter: Features a third-order delta-sigma modulator and a fourth-order digital filter for precise conversions.
- External Voltage Reference: Allows for ratiometric measurements with an external voltage reference up to 5V.
- Simple, Pin-Driven Control: No digital registers to program; controlled by dedicated pins.
- Two-Wire Serial Digital Interface: Easily isolated serial interface compatible with microcontrollers like the MSP430.
- Low-Power Modes: Can be put in a low-power standby mode or completely shut off in power-down mode).
Applications
- Weigh Scales: Ideal for precision weight measurement applications.
- Strain Gauges: Suitable for strain gauge measurements in various industrial settings).
- Pressure Sensors: Used in pressure sensor applications requiring high accuracy and low noise).
- Industrial Measurement Systems: General use in industrial measurement systems that require precise analog-to-digital conversions).
Q & A
- What is the resolution of the ADS1231ID ADC?
The ADS1231ID has a resolution of 24 bits).
- What are the supported data rates for the ADS1231ID?
The ADS1231ID supports data rates of 10 SPS and 80 SPS).
- What is the supply voltage range for the ADS1231ID?
The supply voltage range is from 3V to 5.3V).
- What is the typical noise performance of the ADS1231ID at 10 SPS?
The typical noise performance at 10 SPS is 35.2 nVrms).
- Does the ADS1231ID have an internal oscillator?
Yes, the ADS1231ID includes an internal oscillator).
- How is the data output from the ADS1231ID controlled?
The data output is controlled by dedicated pins and does not require digital registers to program).
- What types of sensors can the ADS1231ID be used with?
The ADS1231ID can be used with bridge sensors, including weigh scales, strain gauges, and pressure sensors).
- What is the package type of the ADS1231ID?
The ADS1231ID is housed in a 16-pin SOIC package).
- Does the ADS1231ID support low-power modes?
Yes, the ADS1231ID can be put in a low-power standby mode or completely shut off in power-down mode).
- How does the ADS1231ID handle 50Hz and 60Hz line-cycle interference?
The ADS1231ID provides excellent rejection of both 50Hz and 60Hz line-cycle interference at a data rate of 10 SPS).
