Texas Instruments ADS1114LIDGSR

Overview

ADS1114LIDGSR from Texas Instruments is a 16-bit, delta-sigma analog-to-digital converter with integrated PGA, digital comparator, and 1.8-V I²C interface. It supports 1 differential (or 1 single-ended) input channel, operates from 2.0 V to 3.6 V, consumes only 150 µA in continuous mode, and delivers up to 860 SPS - enabling precision voltage, current, and temperature monitoring in space-constrained wearables and industrial sensors.

For engineers reviewing the ADS1114LIDGSR datasheet, ADS1114LIDGSR pinout, ADS1114LIDGSR application, or ADS1114LIDGSR equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready procurement details - all grounded in TI's SBASAV5 production datasheet and package documentation for the DGS (VSSOP-10) variant.

Technical Context

The ADS1114LIDGSR implements a 250-kHz modulator clock derived from an internal 1-MHz oscillator, enabling single-cycle settling across all 8 programmable data rates (8–860 SPS). Its switched-capacitor input stage provides differential input impedance ranging from 710 kΩ (±0.256 V FSR) to 22 MΩ (±6.144 V FSR), with common-mode impedance from 3 MΩ to 10 MΩ depending on gain setting.

It integrates a low-drift voltage reference (errors embedded in gain error spec), no external reference support, and a fully self-contained I²C interface with four pin-selectable addresses and 1.8-V logic compatibility - eliminating level-shifting requirements in mixed-voltage systems.

Key Specifications

Pinout & Package

ADS1114LIDGSR is packaged in a 10-pin VSSOP (DGS) measuring 3.00 mm × 4.9 mm, with exposed pad for thermal enhancement and GND connection. Pin functions are validated per TI SBASAV5 Figure 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit I²C ADC applications.

Compared with ADS1114IRUGR, ADS1114LIDGSR offers identical functionality in a larger but more manufacturable VSSOP package; versus ADS1113IDGST, it adds critical signal-conditioning features (PGA, comparator) at modest cost premium - making it optimal for adaptive sensor interfaces requiring dynamic range and safety monitoring.

Availability

ADS1114LIDGSR is available at Aetrix Electronics and suitable for supply-voltage monitoring, current measurement, and temperature sensing applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.

Supply support for ADS1114LIDGSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power signal chains.

The ADS111xL product line was designed specifically for space- and power-constrained sensor measurement systems - integrating PGA, comparator, and 1.8-V I²C to replace discrete signal-conditioning blocks in wearables, industrial IoT, and automotive subsystems.

FAQ

What is the maximum full-scale input voltage range supported by the ADS1114LIDGSR?

The ADS1114LIDGSR supports six programmable full-scale ranges via its internal PGA: ±0.256 V, ±0.512 V, ±1.024 V, ±2.048 V, ±4.096 V, and ±6.144 V. At ±6.144 V range, the device can measure rail-to-rail signals up to the supply voltage (e.g., 3.3 V or 3.6 V), though absolute input limits remain GND – 0.3 V to VDD + 0.3 V per the Absolute Maximum Ratings. The ADS1114LIDGSR achieves 187.5-µV LSB resolution at this highest range.

Does the ADS1114LIDGSR require an external voltage reference?

No, the ADS1114LIDGSR includes a fully integrated, low-drift voltage reference optimized for its delta-sigma architecture. External references are not supported - all conversions are referenced to this internal source, and its accuracy and temperature drift are fully characterized in the gain error and gain drift specifications (e.g., ±0.15% gain error, 5 ppm/°C drift at ±2.048 V FSR). The ADS1114LIDGSR datasheet explicitly states "an external reference cannot be used with these devices."

How does the ALERT/RDY pin function in the ADS1114LIDGSR?

The ALERT/RDY pin on the ADS1114LIDGSR serves dual purpose: it asserts as an open-drain comparator output when programmed thresholds are exceeded (e.g., overvoltage on AIN0), or toggles to indicate completion of a conversion in single-shot mode. It requires an external pullup resistor to VDD (typically 4.7 kΩ) and is electrically compatible with 1.8-V logic. This dual-mode operation eliminates the need for separate status and fault-signaling lines - a key feature confirmed in the ADS1114LIDGSR functional block diagram and register description.

Can the ADS1114LIDGSR operate with a 1.8-V I²C bus while powered from 3.3 V?

Yes, the ADS1114LIDGSR supports true 1.8-V I²C logic levels independent of VDD - meaning SDA and SCL inputs recognize VIH ≥ 1.0 V and VIL ≤ 0.25 V even when VDD = 3.3 V. This is explicitly documented in the "Digital Input Levels" row of the Device Comparison Table and verified in Section 6.5 Electrical Characteristics. The ADS1114LIDGSR thus interfaces seamlessly with 1.8-V microcontrollers without level shifters, reducing system complexity and power loss.

What is the minimum supply voltage required for continuous operation of the ADS1114LIDGSR?

The ADS1114LIDGSR requires a minimum supply voltage of 2.0 V for guaranteed continuous-conversion operation across its full temperature range (–40°C to +125°C), as specified in Section 6.3 Recommended Operating Conditions. Below 2.0 V, functionality is not assured - the internal oscillator may stall, PGA gain accuracy degrades, and I²C communication becomes unreliable. At 2.0 V, the ADS1114LIDGSR draws 150 µA and maintains full 16-bit performance, enabling operation from single Li-ion cells down to 2.0 V cutoff.