Overview
The Texas Instruments ADS1220IRVAR is a precision, 24-bit analog-to-digital converter (ADC) designed to measure small sensor signals with high accuracy and low power consumption. This device is part of the ADS1220 series and is packaged in a 3.5-mm × 3.5-mm × 0.9-mm VQFN-16 package. It features a flexible input multiplexer, a low-noise programmable gain amplifier (PGA), two programmable excitation current sources, an internal voltage reference, an oscillator, and a precision temperature sensor. The ADS1220IRVAR is ideal for applications requiring high resolution and low noise, such as measuring signals from resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 24 Bits |
| Data Rate | Up to 2 kSPS |
| Programmable Gain | 1 V/V to 128 V/V |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Current Consumption | As low as 120 µA (typ) in Duty-Cycle Mode |
| Operating Temperature Range | -40°C to +125°C |
| Package Type | VQFN-16 |
| Input Configuration | Two differential or four single-ended inputs |
| Internal Reference | 2.048-V, 5 ppm/°C (typ) drift |
| Internal Oscillator Accuracy | 2% accurate |
| Temperature Sensor Accuracy | 0.5°C (typ) at 0°C to +75°C |
Key Features
- Low current consumption: As low as 120 µA (typ) in duty-cycle mode.
- Wide supply range: 2.3 V to 5.5 V.
- Programmable gain: 1 V/V to 128 V/V.
- Programmable data rates: Up to 2 kSPS.
- Up to 20-bits effective resolution.
- Simultaneous 50-Hz and 60-Hz rejection at 20 SPS with single-cycle settling digital filter.
- Dual matched programmable current sources: 10 µA to 1.5 mA.
- Internal 2.048-V reference with 5 ppm/°C (typ) drift.
- Internal 2% accurate oscillator.
- Internal temperature sensor with 0.5°C (typ) accuracy.
- SPI-compatible interface (Mode 1).
Applications
The ADS1220IRVAR is suitable for various applications that require precise measurement of small sensor signals, including:
- Resistance temperature detectors (RTDs).
- Thermocouples.
- Thermistors.
- Resistive bridge sensors.
- Noisy industrial environments where simultaneous 50-Hz and 60-Hz rejection is necessary.
Q & A
- What is the resolution of the ADS1220IRVAR?
The ADS1220IRVAR has a resolution of 24 bits. - What are the programmable gain options for the ADS1220IRVAR?
The programmable gain ranges from 1 V/V to 128 V/V. - What is the maximum data rate of the ADS1220IRVAR?
The maximum data rate is up to 2 kSPS. - What is the supply voltage range for the ADS1220IRVAR?
The supply voltage range is from 2.3 V to 5.5 V. - How much current does the ADS1220IRVAR consume in duty-cycle mode?
The current consumption is as low as 120 µA (typ) in duty-cycle mode. - What types of inputs does the ADS1220IRVAR support?
The device supports two differential or four single-ended inputs. - Does the ADS1220IRVAR have an internal temperature sensor?
Yes, it has an internal temperature sensor with 0.5°C (typ) accuracy. - What is the accuracy of the internal oscillator?
The internal oscillator is 2% accurate. - Can the ADS1220IRVAR reject 50-Hz and 60-Hz noise simultaneously?
Yes, at 20 SPS, the digital filter offers simultaneous 50-Hz and 60-Hz rejection. - What is the package type of the ADS1220IRVAR?
The package type is VQFN-16.
