Overview
The ADS1220, produced by Texas Instruments, is a precision, 24-bit analog-to-digital converter (ADC) designed to optimize system cost and component count. This low-power ADC is particularly suited for applications involving small sensor signals, such as resistance temperature detectors (RTDs), thermocouples, thermistors, and resistive bridge sensors. It offers a wide range of integrated features including a programmable gain amplifier (PGA), dual matched programmable current sources, an internal voltage reference, an oscillator, a low-side switch, and a precision temperature sensor.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 Bits | |
| Data Rate | Up to 2000 SPS (Turbo Mode) | |
| Supply Voltage Range | 2.3 V to 5.5 V | V |
| Current Consumption | As low as 120 μA (typ) in Duty-Cycle Mode | μA |
| Programmable Gain | 1 V/V to 128 V/V | |
| Internal Reference | 2.048 V, 5 ppm/°C (typ) Drift | V |
| Input Types | Two Differential or Four Single-Ended Inputs | |
| Temperature Range | –40°C to +125°C | °C |
| Package Options | VQFN-16, TSSOP-16 |
Key Features
- Low Power Consumption: As low as 120 μA in duty-cycle mode.
- Programmable Gain Amplifier (PGA): Gains up to 128 V/V.
- Integrated Features: Includes dual matched programmable current sources, an internal 2.048-V reference, an internal oscillator, a low-side switch, and a precision temperature sensor.
- Flexible Input Options: Supports two differential or four single-ended inputs.
- High Accuracy and Resolution: Up to 20-bit effective resolution and simultaneous 50-Hz and 60-Hz rejection at 20 SPS.
- Wide Supply Range: Operates from 2.3 V to 5.5 V.
Applications
- Temperature Measurement: Ideal for measuring signals from RTDs, thermocouples, and thermistors.
- Resistive Bridge Sensors: Suitable for applications involving resistive bridge sensors.
- Industrial Automation: Useful in noisy industrial environments due to its simultaneous 50-Hz and 60-Hz rejection.
- Medical Devices: Can be used in medical devices requiring high precision and low noise.
- Automotive and Aerospace: Applicable in various automotive and aerospace applications requiring precise analog-to-digital conversion.
Q & A
- What is the resolution of the ADS1220 ADC?
The ADS1220 has a resolution of 24 bits.
- What are the data rate options for the ADS1220?
The ADS1220 supports data rates up to 2000 SPS in turbo mode.
- What is the power consumption of the ADS1220 in duty-cycle mode?
The power consumption is as low as 120 μA in duty-cycle mode.
- What are the package options available for the ADS1220?
The ADS1220 is available in VQFN-16 and TSSOP-16 packages.
- What types of inputs does the ADS1220 support?
The ADS1220 supports two differential or four single-ended inputs.
- What is the temperature range for the ADS1220?
The device operates over a temperature range of –40°C to +125°C.
- Does the ADS1220 have an internal reference voltage?
Yes, the ADS1220 has an internal 2.048-V reference with a drift of 5 ppm/°C.
- How does the ADS1220 handle noise in industrial applications?
The ADS1220 offers simultaneous 50-Hz and 60-Hz rejection at 20 SPS, making it suitable for noisy industrial environments.
- Can the ADS1220 be used for temperature measurements?
Yes, the ADS1220 is ideal for temperature measurements using RTDs, thermocouples, and thermistors.
- What are some common applications of the ADS1220?
The ADS1220 is commonly used in industrial automation, medical devices, and various automotive and aerospace applications.
