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The ADS1220 24-Bit ADC Module is a high-resolution analog-to-digital converter module designed for applications requiring precise analog measurements, low power consumption and flexible signal conditioning.
Based on the ADS1220, the module uses a 24-bit Delta-Sigma (ΔΣ) conversion architecture and provides up to 4 multiplexed analog inputs, supporting both differential and single-ended measurements.
The integrated programmable gain amplifier (PGA) provides selectable gains from 1× to 128×, making the module particularly suitable for low-level signals generated by sensors. The integrated PGA allows small analog signals to be amplified before conversion, reducing the need for external amplification circuitry in many applications.
The ADS1220 supports conversion rates of up to 2 kSPS, allowing the user to select different operating configurations according to the required speed, resolution and power consumption.
The device also features digital filtering and simultaneous 50 Hz and 60 Hz rejection at 20 SPS, making it suitable for precision instrumentation and measurement applications.
Additional integrated features include an internal voltage reference, support for an external reference, two programmable excitation current sources (IDACs) and an internal temperature sensor.
Communication with the host microcontroller is performed through a SPI interface, making the module suitable for platforms such as Arduino, ESP32, STM32, Raspberry Pi, Teensy and other SPI-compatible microcontrollers.
Key Features
- 24-bit ADC
- Based on ADS1220
- Delta-Sigma (ΔΣ) architecture
- 4 multiplexed analog inputs
- Differential and single-ended measurements
- Integrated programmable PGA
- Gain settings from 1× to 128×
- Conversion rates up to 2 kSPS
- SPI digital interface
- Internal or external voltage reference
- 2 integrated IDAC excitation current sources
- Integrated temperature sensor
- 50 Hz / 60 Hz rejection
- Low-power operation
- Supply voltage from 2.3 V to 5.5 V
- Suitable for low-level analog signals
- Designed for precision measurement and data acquisition
Technical Specifications
| Feature |
Specification |
| Converter |
ADS1220 |
| Resolution |
24 bits |
| Architecture |
Delta-Sigma |
| Number of channels |
4 multiplexed channels |
| Input type |
Differential / Single-ended |
| Digital interface |
SPI |
| SPI mode |
SPI Mode 1 |
| Maximum conversion rate |
2 kSPS |
| PGA gain |
1×, 2×, 4×, 8×, 16×, 32×, 64×, 128× |
| Voltage reference |
Internal / External |
| Excitation current sources |
2 × IDAC |
| Temperature sensor |
Integrated |
| 50/60 Hz rejection |
Yes, at 20 SPS |
| Analog supply |
2.3 V to 5.5 V |
| Digital supply |
2.3 V to 5.5 V |
| Typical IC power consumption |
Approximately 1.4 mW |
| Operating temperature |
-40 °C to +125 °C |
| Conversion type |
Delta-Sigma |
| Digital output |
24-bit, two's complement |
SPI Interface
The module communicates with the host microcontroller through a SPI serial interface.
Main signals include:
- CS – Chip Select
- SCLK – SPI Clock
- DIN – Serial Data Input / MOSI
- DOUT/DRDY – Serial Data Output / Data Ready
- DRDY – Data Ready
- GND – Ground
- VCC / DVDD – Supply
The DRDY signal can be used by the microcontroller to detect when a new ADC conversion result is available.
Applications
The ADS1220 module is suitable for a wide range of precision measurement and data acquisition applications, including:
- High-resolution voltage measurement
- Digital voltmeters
- Data acquisition systems
- Analog sensors
- Pressure sensors
- Force sensors
- Temperature sensors
- RTD / PT100 / PT1000
- Thermocouples
- Load cells
- Strain gauges
- Wheatstone bridges
- Electronic instrumentation
- Laboratory equipment
- Industrial measurement systems
- Process monitoring
- Battery-powered measurement equipment
- Arduino projects
- ESP32 projects
- STM32 projects
- Raspberry Pi projects
Sensor Measurement
One of the main advantages of the ADS1220 is its ability to interface with low-level sensor signals.
The programmable PGA allows the gain to be selected according to the signal level, while the differential inputs are suitable for applications such as Wheatstone bridges, load cells and strain gauges.
The integrated IDAC current sources can also be used to provide excitation for sensors such as RTDs, PT100 and PT1000, helping simplify the overall measurement circuit.
Low-Power Operation
The ADS1220 is designed for low-power data acquisition applications.
The IC has a typical power consumption of approximately 1.4 mW and provides operating modes that can reduce power consumption when continuous conversion is not required.
This makes the module suitable for:
- Portable instruments
- Battery-powered equipment
- IoT sensor systems
- Remote monitoring
- Low-power data acquisition systems
High Resolution and Programmable Gain
The combination of 24-bit resolution and the integrated PGA provides high sensitivity for low-level analog signals.
Available gain settings include:
1× / 2× / 4× / 8× / 16× / 32× / 64× / 128×
This flexibility allows the module to be used with a wide range of sensors and analog signal levels.
Compatible Platforms
The module can be integrated with systems providing SPI communication, including:
- Arduino
- ESP32
- STM32
- Raspberry Pi
- Teensy
- Other SPI-compatible microcontrollers
Electrical compatibility should always be verified for the specific development board and the exact module implementation.
Package Contents
1 × ADS1220 24-bit ADC converter module
2 x Headers male/male
