The ADS1118 is a 16-bit, SPI-compatible analog-to-digital converter with an internal voltage reference, oscillator, programmable gain amplifier and a temperature sensor, running from 2 V to 5.5 V at up to 860 samples per second. It is the SPI alternative to the I2C ADS1115, and its temperature sensor helps with thermocouple cold-junction compensation. Figures are from the Texas Instruments ADS1118 datasheet SBAS457F.
Key specifications
| Resolution | 16-bit |
|---|---|
| Rate | 8 to 860 SPS |
| Inputs | 4 single-ended or 2 differential |
| Supply | 2–5.5 V |
| Current | 150 µA continuous |
| PGA | ±256 mV to ±6.144 V |
| Packages | X2QFN-10, VSSOP-10 |
What the datasheet promises
| Item | Datasheet value |
|---|---|
| Resolution | 16-bit |
| Data rate | Programmable, 8 SPS to 860 SPS, with single-cycle settling |
| Inputs | Four single-ended or two differential, through an input multiplexer |
| Input ranges | Programmable gain amplifier from ±256 mV to ±6.144 V |
| Supply voltage | 2 V to 5.5 V |
| Supply current | 150 µA in continuous mode; single-shot mode powers down automatically |
| Internal temperature sensor | 0.5 °C maximum error from 0 to 70 °C |
| Reference and clock | Internal low-drift reference and oscillator |
| Interface | SPI compatible |
| Temperature | Specified −40 to 125 °C |
| Packages | X2QFN-10 (2 × 1.5 mm) and VSSOP-10 (3 × 3 mm) |
The datasheet shows a K-type thermocouple example that uses the internal temperature sensor for cold-junction compensation. Single-shot mode cuts the average current a lot when you read only now and then.
Using it on a robot
- Read a thermocouple or thermistor with one small chip, as in the datasheet example.
- Use SPI where the I2C bus is busy or you want a faster interface than I2C.
- Use the faster 12-bit ADS1015 when speed matters more than resolution.
Sources and further reading
- Texas Instruments ADS1118 datasheet (SBAS457F) — resolution, data rate, inputs, ranges, supply, current, temperature sensor, interface and packages above.
Last reviewed: November 2026. Limits are from the Texas Instruments datasheet; breakout boards and modules vary. No price is quoted because it has not been checked.
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