ADS1110A6IDBVRG4
ADS1110A6IDBVRG4 - 16-Bit 240SPS Delta-Sigma ADC | Texas Instruments
The Texas Instruments ADS1110A6IDBVRG4 is a 16-bit, 240-SPS, single-channel delta-sigma analog-to-digital converter (ADC) with differential inputs, an integrated 2.048 V reference, an on-chip programmable gain amplifier (PGA), an internal oscillator, and an I2C-compatible serial interface, all housed in a 6-pin SOT-23 package. The SOT-23-6 footprint makes it one of the smallest precision ADCs available for industrial-temperature instrumentation.
A delta-sigma ADC is a type of analog-to-digital converter that uses oversampling and noise-shaping to achieve high resolution at low sample rates. The ADS1110's sigma-delta modulator front end, combined with a digital SINC4 filter, delivers true 16-bit noise-free resolution. Because delta-sigma converters trade speed for resolution, the ADS1110 is optimized for precision DC and low-frequency measurements rather than audio or wideband signal acquisition, where successive-approximation register (SAR) ADCs would be more appropriate. The part integrates a PGA with gains of 1, 2, 4, or 8, which lets small differential signals (down to ±15 mV full scale) be digitized directly without external front-end amplification.
Key features include differential input ranges of ±2.048 V, ±1.024 V, ±0.512 V, and ±0.256 V, 15 / 30 / 60 / 240 SPS selectable data rates, an integrated 2.048 V low-drift reference, and a single-supply 2.7 V to 5.5 V analog/digital supply range. The converter is continuously self-calibrating, includes an on-chip oscillator (no external crystal required), and offers four I2C slave addresses. Per the manufacturer datasheet, the part dissipates only 0.9 mW at 240 SPS on a 3 V supply, enabling battery-friendly designs.
The architecture combines a switched-capacitor delta-sigma modulator with a third-order digital filter, achieving >84 dB of power-supply rejection at the modulator and excellent common-mode noise immunity, both essential for industrial sensor measurements. The internal reference drift is typically 5 ppm/°C, and the PGA eliminates the gain-error budget of an external instrumentation amplifier in many thermocouple and bridge-sensor applications.
Typical applications include portable instrumentation, temperature measurement with thermocouples or RTDs, strain-gauge and load-cell readouts, factory-multimeter controllers, battery monitoring, and any space-constrained precision measurement node. Designers benefit from the ADS1110A6IDBVRG4's small footprint, self-contained approach (reference + oscillator + PGA), and low power draw when designing wearables, IoT edge nodes, and industrial sensor front ends.
When designing with this part, use a 0.1 µF decoupling capacitor on VDD placed within 5 mm of the pin, keep analog and digital grounds joined at a single star point under the IC, and choose the lowest data rate that meets system bandwidth to maximize effective resolution. A 10 nF bypass on AIN+/AIN- improves common-mode noise rejection in noisy environments.
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