Texas Instruments ADS1112IDGSTG4

Overview

ADS1112IDGSTG4 from Texas Instruments is a 16-bit delta-sigma analog-to-digital converter with integrated PGA, 2.048V reference, I²C interface, and MSOP-10 package. It supports two differential or three single-ended input channels, operates from 2.7V to 5.5V, consumes only 240µA in active mode, and delivers ±0.01% INL - enabling high-accuracy temperature sensing and industrial process monitoring in space-constrained portable instrumentation.

For engineers reviewing the ADS1112IDGSTG4 datasheet, ADS1112IDGSTG4 pinout, ADS1112IDGSTG4 application, or ADS1112IDGSTG4 equivalent, key selection considerations include its self-calibrating architecture, programmable data rates (15–240 SPS), onboard oscillator (no external clock required), I²C address select via A0/A1 pins, and guaranteed no missing codes across all resolution modes.

Technical Context

The ADS1112IDGSTG4 employs a continuously self-calibrating delta-sigma modulator with digital filtering, eliminating manual calibration. Its input multiplexer selects between two differential pairs (AIN0–AIN1, AIN2–AIN3) or three single-ended inputs referenced to AIN3, controlled by INP bits in the configuration register.

It integrates a fixed 2.048V reference (±0.05%, 5ppm/°C drift) used exclusively by the ADC core - not accessible externally - and a programmable gain amplifier (PGA) with gains of 1, 2, 4, or 8. The onboard oscillator drives conversion timing; no external clock input is supported, and high-speed I²C (up to 3.4MHz) requires explicit Hs-mode activation.

Key Specifications

Pinout & Package

ADS1112IDGSTG4 is packaged in a 10-pin MSOP (DGS) with 0.5mm pitch, rated for −40°C to +85°C operation. Pin functions are validated per TI SBAS282D datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision ADC applications.

Compared with ADS1112IDGSTG4, ADS1113IDGST lacks differential input flexibility but matches its size and power profile, while MCP3424-E/ST offers higher resolution at significantly reduced speed and increased design complexity due to external timing and reference dependencies.

Availability

ADS1112IDGSTG4 is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and smart transmitter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADS1112IDGSTG4 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 acquisition and low-power signal chain solutions.

The ADS1112IDGSTG4 belongs to TI's precision delta-sigma ADC product line, designed specifically for space- and power-constrained applications demanding high resolution, integrated references, and simplified I²C-based system integration.

FAQ

What is the maximum differential input voltage range for the ADS1112IDGSTG4?

The ADS1112IDGSTG4 has a full-scale differential input range of ±2.048V, determined by its internal 2.048V reference and PGA gain setting. With PGA = 1, the absolute input voltage on AIN0 or AIN1 must remain within GND − 0.2V to VDD + 0.2V. Exceeding ±2.048V causes clipping; the device does not support external reference scaling.

Does the ADS1112IDGSTG4 require an external clock source?

No, the ADS1112IDGSTG4 includes a fully integrated oscillator and requires no external clock. Its internal clock drives the delta-sigma modulator and digital filter at ~275kHz (supply- and temperature-dependent). External clock inputs are not supported, and the SCL pin is receive-only for I²C communication.

How many I²C addresses does the ADS1112IDGSTG4 support?

The ADS1112IDGSTG4 supports eight unique I²C slave addresses via the A0 and A1 pins, which can be set to logic low, logic high, or left floating. Valid combinations yield addresses 0x48–0x4F (binary 1001000 to 1001111); the "float-float" state is invalid and must be avoided in layout.

Can the ADS1112IDGSTG4 measure true differential signals with negative common-mode voltage?

No. While the ADS1112IDGSTG4 accepts differential inputs, both AIN0 and AIN1 must remain within GND − 0.2V to VDD + 0.2V. It does not support negative common-mode voltages below ground. For true bipolar differential operation, external level-shifting circuitry is required before the ADS1112IDGSTG4 inputs.

What is the role of the ST/DRDY bit in the ADS1112IDGSTG4 configuration register?

The ST/DRDY bit serves dual roles: when written in single-conversion mode, it triggers a conversion; when read, it indicates whether the output register contains new unread data (0 = new, 1 = previously read). In continuous mode, it reflects conversion readiness and must be polled to avoid reading stale results from the ADS1112IDGSTG4 output register.