Overview
The ADS1120-Q1, produced by Texas Instruments, is a precision 16-bit analog-to-digital converter (ADC) designed for applications requiring the measurement of small sensor signals. This device is particularly suited for automotive and industrial environments due to its AEC-Q100 qualification and functional safety capabilities. It features a wide supply range of 2.3 V to 5.5 V and operates over a temperature range of –40°C to +125°C. The ADS1120-Q1 integrates multiple components, including a programmable gain amplifier (PGA), voltage reference, oscillator, and temperature sensor, to reduce system cost and component count.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 16-bit |
| Sample Rate | 5 SPS to 2 kSPS |
| Input Configuration | Two differential or four single-ended inputs |
| Programmable Gain | 1 V/V to 128 V/V |
| Internal Reference | 2.048-V, 5 ppm/°C (typ) drift |
| Internal Oscillator | 2% accurate |
| Internal Temperature Sensor | 0.5°C (typ) accuracy |
| Interface | SPI-compatible (mode 1) |
| Power Supply Range | 2.3 V to 5.5 V |
| Package | TSSOP-16 |
| Operating Temperature Range | –40°C to +125°C |
Key Features
- Low-noise, programmable gain amplifier (PGA) with gains up to 128 V/V
- Dual-matched programmable current sources: 50 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)
- Simultaneous 50-Hz and 60-Hz rejection at 20 SPS with single-cycle settling digital filter
- Low power consumption: as low as 120 µA in duty-cycle mode with PGA disabled
- AEC-Q100 qualified for automotive applications and functional safety-capable
Applications
- Temperature sensors: thermocouples, resistance temperature detectors (RTDs) - 2-, 3-, or 4-wire types
- Bridge sensors: pressure sensors, strain gauges
- Battery voltage and current measurements
- Automotive and industrial applications requiring precise measurement of small sensor signals
Q & A
- What is the resolution of the ADS1120-Q1 ADC?
The ADS1120-Q1 has a 16-bit resolution.
- What is the sample rate range of the ADS1120-Q1?
The sample rate range is from 5 SPS to 2 kSPS.
- What types of inputs does the ADS1120-Q1 support?
The device supports two differential or four single-ended inputs.
- What is the range of the programmable gain amplifier (PGA) in the ADS1120-Q1?
The PGA offers gains from 1 V/V to 128 V/V.
- Does the ADS1120-Q1 have an internal temperature sensor?
Yes, it has an internal temperature sensor with 0.5°C (typ) accuracy.
- What is the power supply range for the ADS1120-Q1?
The power supply range is from 2.3 V to 5.5 V.
- What is the operating temperature range of the ADS1120-Q1?
The operating temperature range is from –40°C to +125°C.
- Is the ADS1120-Q1 AEC-Q100 qualified?
Yes, the ADS1120-Q1 is AEC-Q100 qualified for automotive applications.
- What interface does the ADS1120-Q1 use for communication?
The device uses a SPI-compatible interface (mode 1).
- What is the minimum power consumption of the ADS1120-Q1?
The minimum power consumption is as low as 120 µA in duty-cycle mode with the PGA disabled.
