Overview
The ADS1220IPW, produced by Texas Instruments, 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 family and is packaged in a 16-pin TSSOP (Thin Shrink Small Outline Package). It integrates multiple features such as a programmable gain amplifier (PGA), voltage reference, oscillator, and a precision temperature sensor, making it ideal for various industrial and portable instrumentation applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Power Supply Voltage (AVDD to AVSS) | 2.3 | - | 5.5 | V |
| Power Supply Voltage (DVDD to DGND) | 2.3 | - | 5.5 | V |
| Analog Input Voltage Range | AVSS - 0.1 | - | AVDD + 0.1 | V |
| Programmable Gain | 1 V/V | - | 128 V/V | - |
| Data Rate | 20 SPS | - | 2000 SPS | SPS |
| Resolution | - | 24 Bits | - | - |
| Current Consumption (Duty-Cycle Mode) | - | 120 μA | - | μA |
| Temperature Range | -40°C | - | +125°C | °C |
| Internal Reference Accuracy | 2.045 | 2.048 | 2.051 | V |
| Internal Oscillator Accuracy | -2% | ±1% | 2% | - |
Key Features
- Low current consumption: As low as 120 μA 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 2000 samples per second (SPS).
- Simultaneous 50-Hz and 60-Hz rejection at 20 SPS with single-cycle settling digital filter.
- Two differential or four single-ended inputs through a flexible input multiplexer (MUX).
- 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
- Temperature sensor measurements: Thermistors, thermocouples, resistance temperature detectors (RTDs) - 2-, 3-, or 4-wire types.
- Resistive bridge sensor measurements: Pressure sensors, strain gauges, weigh scales.
- Portable instrumentation.
- Factory automation and process control.
Q & A
- What is the typical current consumption of the ADS1220 in duty-cycle mode?
The typical current consumption is as low as 120 μA in duty-cycle mode.
- What is the range of the programmable gain for the ADS1220?
The programmable gain ranges from 1 V/V to 128 V/V.
- What are the maximum and minimum data rates supported by the ADS1220?
The data rates range from 20 SPS to 2000 SPS.
- Does the ADS1220 support simultaneous 50-Hz and 60-Hz rejection?
- How many analog inputs does the ADS1220 support?
The device supports two differential or four single-ended inputs.
- What is the accuracy of the internal temperature sensor?
The internal temperature sensor has an accuracy of 0.5°C (typ).
- What is the operating temperature range of the ADS1220?
The operating temperature range is from -40°C to +125°C.
- Does the ADS1220 have an internal oscillator?
- What type of interface does the ADS1220 use for communication?
The device uses an SPI-compatible interface (Mode 1).
- What are some common applications of the ADS1220?
