Overview
The ADS1120IRVAR, produced by Texas Instruments, is a precision 16-bit analog-to-digital converter (ADC) designed for applications requiring high accuracy and low power consumption. This device integrates multiple features to reduce system cost and component count, making it ideal for measuring small sensor signals. It includes a flexible input multiplexer, a low-noise programmable gain amplifier (PGA), two programmable excitation current sources, a voltage reference, an oscillator, a low-side switch, and a precision temperature sensor.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 16 Bits | |
| Data Rate | Up to 2000 SPS (Turbo mode), 20, 45, 90, 175, 330, 600, 1000 SPS (Normal mode) | SPS |
| Supply Voltage Range | 2.3 V to 5.5 V | V |
| Programmable Gain | 1 V/V to 128 V/V | V/V |
| Input Current (Analog Supply) | As low as 120 µA (Duty-cycle mode, PGA disabled) | µA |
| Operating Temperature Range | –40°C to +125°C | °C |
| Package Options | VQFN-16, TSSOP-16 | |
| Integral Nonlinearity (INL) | ±8 ppm to ±20 ppm FSR | ppm FSR |
| Offset Voltage | ±4 µV (PGA disabled, differential inputs) | µV |
| Gain Error | ±2.045 to ±2.051 V (Initial accuracy at 25°C) | V |
Key Features
- Low power consumption: As low as 120 µA in duty-cycle mode with PGA disabled.
- Programmable gain amplifier (PGA): Gains up to 128 V/V, suitable for measuring small sensor signals like RTDs, thermocouples, thermistors, and bridge sensors.
- Flexible input multiplexer: Supports two differential or four single-ended inputs.
- Programmable excitation current sources: Six current settings from 50 µA to 1500 µA.
- Precision temperature sensor: 14-bit resolution, ±0.25 °C accuracy from 0°C to +75°C.
- Internal voltage reference and oscillator.
- Low-side switch and digital filter for 50-Hz and 60-Hz rejection.
- SPI interface for communication.
Applications
- Weigh scales and industrial automation.
- Portable instrumentation and medical devices.
- Factory automation and process controls.
- Measurement of resistance temperature detectors (RTDs), thermocouples, thermistors, and bridge sensors.
Q & A
- What is the resolution of the ADS1120 ADC?
The ADS1120 has a 16-bit resolution.
- What are the available data rates for the ADS1120?
The data rates range from 20 SPS to 2000 SPS in various modes (Normal, Duty-cycle, Turbo).
- What is the supply voltage range for the ADS1120?
The supply voltage range is from 2.3 V to 5.5 V.
- What are the programmable gain options for the ADS1120?
The PGA offers gains from 1 V/V to 128 V/V.
- How low can the power consumption of the ADS1120 be?
Power consumption can be as low as 120 µA in duty-cycle mode with the PGA disabled.
- What types of packages are available for the ADS1120?
The ADS1120 is available in VQFN-16 and TSSOP-16 packages.
- What is the operating temperature range of the ADS1120?
The operating temperature range is from –40°C to +125°C.
- Does the ADS1120 have an internal temperature sensor?
Yes, it includes a precision temperature sensor with 14-bit resolution.
- What communication interface does the ADS1120 use?
The ADS1120 uses an SPI interface for communication.
- What are some common applications for the ADS1120?
Common applications include weigh scales, portable instrumentation, factory automation, and process controls.
