16-bit sigma-delta ADC with I²C — the precision front-end for tight spaces
The ADS1115IDGSR is a 16-bit, low-power, sigma-delta ADC from Texas Instruments, integrating an input multiplexer, programmable gain amplifier (PGA), internal voltage reference, and I²C interface in a compact 10-VSSOP package. Two differential or four single-ended inputs (via the internal MUX) cover most sensor-conditioning scenarios without external signal switching. The PGA offers gains from ±256 mV to ±6.144 V full-scale, letting the ADC resolve microvolt-level signals directly from bridge sensors or thermocouples.
Supply range, temperature grade, and package — what the BOM needs to know
The digital supply is the same range, so the I²C bus voltage matches the ADC supply — no level shifter needed when the host MCU runs at the same voltage. The 10-VSSOP package (3.00 mm width) fits on dense PCBs; the 0.50 mm pitch demands a careful solder-paste stencil aperture to avoid bridging during reflow.
The part is widely cross-referenced; the ADS1115 family (base product number ADS1115) shares the same footprint and I²C register map across the IDGSR, IDGST, and other tape-and-reel variants, so a reel-size change does not require a PCB spin.