ADS1118IRUGT

Texas Instruments ADS1118IRUGT – 16‑bit Delta‑Sigma ADC with SPI, 860 SPS, 4‑Channel Mux, and Temperature Sensor

The Texas Instruments ADS1118IRUGT is a precision, low‑power 16‑bit delta‑sigma (ΔΣ) analog‑to‑digital converter designed for embedded measurement systems that need high resolution, simple interfacing, and compact size. With an SPI‑compatible serial interface, an integrated temperature sensor for cold‑junction compensation, and an input multiplexer that supports up to four single‑ended or two differential channels, this device streamlines precision sensing designs in portable and industrial environments. Housed in the 10‑pin X2QFN (RUG) package and supplied in Tape & Reel, the ADS1118IRUGT helps engineers build accurate, space‑efficient data acquisition solutions without unnecessary external components.

At‑a‑Glance

• Manufacturer/Brand: Texas Instruments
• MPN: ADS1118IRUGT (Series: ADS1118)
• Converter Architecture: Delta‑Sigma (ΔΣ)
• Resolution: 16‑bit
• Maximum Throughput: Up to 860 samples per second (SPS)
• Interface: SPI‑compatible serial
• Integrated Features: Internal temperature sensor; programmable gain amplifier (PGA)
• Input Multiplexer: 4 single‑ended or 2 differential inputs
• Package: 10‑Pin X2QFN (RUG)
• Mounting Type: Surface Mount
• Pin Count: 10

Overview

Texas Instruments designed the ADS1118IRUGT to give designers a balanced blend of resolution, flexibility, and simplicity. The 16‑bit delta‑sigma core provides fine measurement granularity appropriate for low‑level signals, while the on‑chip multiplexer enables multi‑channel sensing without adding external analog switches. The integrated temperature sensor is particularly valuable in thermocouple applications, where cold‑junction compensation (CJC) is required to obtain accurate absolute temperature readings. Because communication is handled over an SPI‑compatible interface, the device connects easily to a wide range of microcontrollers and processors.

For teams building battery‑powered or space‑constrained systems, the 10‑pin X2QFN (RUG) package reduces board footprint and enables high‑channel‑density measurement nodes. The programmable gain amplifier (PGA) further simplifies the analog front end by allowing the system to tailor input scaling to the expected signal level, helping to maximize measurement resolution across a variety of sensors.

Key Specifications

• Core architecture: Delta‑Sigma (ΔΣ)
• Resolution: 16‑bit
• Data rate: Up to 860 SPS
• Serial interface: SPI‑compatible
• Input channels: 4 single‑ended or 2 differential (via internal multiplexer)
• Integrated features: Internal temperature sensor; PGA
• Package / case: 10‑pin X2QFN (RUG code)
• Mounting: Surface Mount
• Pin count: 10

Note: Parameters not listed above are not specified in the provided dataset. For full electrical limits and timing, refer to the Texas Instruments ADS1118 datasheet.

Why Choose the ADS1118IRUGT

• High integration for simpler BOM: With a built‑in multiplexer, PGA, and temperature sensor, the ADS1118IRUGT reduces external components and routing complexity.
• Resolution where it matters: 16‑bit delta‑sigma conversion is well‑suited to low‑frequency precision measurements and sensor interfaces.
• Flexible channeling: Support for two differential or four single‑ended inputs allows one device to cover multiple sensors or measurement points.
• Compact, surface‑mount package: The X2QFN‑10 (RUG) form factor supports dense layouts and portable designs.
• Straightforward digital interface: SPI‑compatible signaling aligns with common MCU peripherals and toolchains.

Architecture and Design Considerations

Delta‑sigma ADCs like the Texas Instruments ADS1118IRUGT excel at low‑bandwidth, high‑accuracy measurements. The ΔΣ modulator oversamples the input and shapes noise into higher frequencies, while the digital filter reconstructs a precise, low‑noise measurement. The tradeoff is that very high sampling rates are not the goal; instead, the device focuses on fidelity at modest data rates—up to 860 SPS in this case.

• Channel multiplexing: The internal mux enables sequencing through up to four single‑ended inputs or two differential pairs. In time‑multiplexed systems, allow sufficient settle time in your firmware between channel selections before capturing data to ensure consistent results.
• PGA utilization: Using the programmable gain amplifier lets you scale low‑level sensor outputs to the ADC’s usable input range, helping improve effective resolution. Choose gain settings aligned with your maximum expected signal to avoid saturation.
• Temperature sensing and CJC: The integrated temperature sensor is highly convenient for thermocouple inputs, where accurate cold‑junction temperature is necessary for correct absolute measurements. By reading the on‑chip temperature, firmware can perform CJC calculations without external temperature ICs at the connector.
• Layout guidance: Keep low‑level sensor traces short and well‑shielded. Reference and sensor returns should connect at a quiet ground point. While the ADS1118IRUGT simplifies the BOM, board‑level practices—solid ground plane, careful separation of noisy digital lines from sensitive analog nodes—remain key to achieving the converter’s potential.

Typical Applications

The ADS1118IRUGT’s feature set lines up with a wide array of precision sensing tasks:

• Temperature sensing and cold‑junction compensation
• Thermocouple measurement
• Portable instrumentation
• Data acquisition modules
• Industrial sensing

Example use cases include:

• Multi‑channel thermocouple logger: Two differential channels can capture two thermocouples with on‑chip temperature used for CJC, minimizing external components.
• Portable test instrument: The small X2QFN package conserves space, and the SPI interface enables quick integration with a low‑power MCU.
• Industrial sensor node: The PGA helps condition signals of varying amplitudes, giving a single ADC the flexibility to measure different transducers.

Integration with Host Controllers

Because the Texas Instruments ADS1118IRUGT uses an SPI‑compatible serial interface, it pairs readily with MCUs and MPUs that provide standard SPI peripherals. This lowers firmware overhead and shortens bring‑up time, especially in platforms already using SPI for other peripherals. In multi‑device systems, standard chip‑select handling allows sharing the SPI bus with other devices, provided timing and throughput budgets are met.

When multiplexing multiple channels, consider a polling or interrupt‑driven approach coordinated with conversion timing. Selecting data rates near the top end (up to 860 SPS) increases throughput but reduces available time for processing and may impact noise filtering; choose settings based on the noise environment and desired latency.

Packaging and Assembly

• Package: X2QFN‑10 (RUG)
• Packaging: Tape & Reel (TR)
• Mounting: Surface mount

The X2QFN package is designed for compact layouts. Ensure your PCB footprint adheres to TI’s recommended land pattern for the RUG package code and that your assembly process supports proper solder reflow for leadless QFN‑style packages. Thermal relief and via‑in‑pad practices should follow your manufacturer’s guidance.

Lifecycle, Availability, and Sourcing

• Lifecycle status: Active (per Texas Instruments product page)
• Series: ADS1118
• Approved alternates: Not specified in provided data
• Direct replacements/crosses: Not specified in provided data

For procurement teams, the ADS1118IRUGT being marked Active indicates ongoing production support from Texas Instruments. Packaging in Tape & Reel streamlines automated assembly and helps maintain consistency across high‑volume builds. Always verify current lead times and availability with your authorized distributor network or TI’s website.

Compliance and Environmental

• RoHS/Environmental: Not specified in provided data

Compliance can vary by lot and regional requirements. For the most current RoHS, REACH, or green‑status declarations, consult the Texas Instruments product page or compliance documentation. If your quality process requires formal Certificates of Compliance, request these from your authorized distributor or directly from TI.

Specifications Summary

• Brand/Manufacturer: Texas Instruments
• MPN: ADS1118IRUGT
• Category: Analog‑to‑Digital Converters (ADCs)
• Architecture: Delta‑Sigma (ΔΣ)
• Resolution: 16‑bit
• Maximum sample rate: 860 SPS
• Interface: SPI‑compatible serial
• Channels: 4 single‑ended or 2 differential (via mux)
• Integrated features: Internal temperature sensor; PGA
• Package code: RUG
• Case/package: X2QFN‑10
• Pin count: 10
• Mounting type: Surface Mount
• Packaging: Tape & Reel (TR)
• Lifecycle status: Active
• RoHS/Environmental: Not specified in provided data

If a parameter you need is not listed here, it is not specified in the provided dataset. Please refer to the datasheet for detailed electrical characteristics, timing, and mechanical drawings.

Design Tips for Faster Bring‑Up

• Start with conservative data rates: Begin evaluation at moderate SPS to balance noise filtering and latency; only increase to higher rates if the application requires it.
• Calibrate your chain: Use the on‑chip temperature sensor to implement cold‑junction compensation in thermocouple systems. Consider a one‑time or periodic calibration routine for sensor and system offsets.
• Maintain clean references and grounds: Keep analog and digital grounds well‑managed. Route SPI lines away from sensitive analog nodes and use series damping if needed.
• Plan your channel scan: In multi‑channel systems, define a predictable channel‑switching schedule and allow appropriate settle times after changing the mux configuration.

Applications in Context

• Thermocouple interfaces: The combination of differential inputs, PGA, and integrated temperature sensor creates a compact solution for K‑type, J‑type, and other thermocouple measurements. The SPI interface makes it easy to pair with MCUs that compute CJC and linearization in firmware.
• Portable/handheld instruments: Space savings from the X2QFN package and minimal external analog conditioning enable sleek, battery‑friendly designs for field diagnostics and maintenance tools.
• Industrial sensing: In factory or building automation, the ADS1118IRUGT can front‑end a variety of sensors, from bridge‑type to resistive and voltage‑output, benefiting from the device’s resolution and flexible gain.

Resources

• Datasheet: https://www.ti.com/lit/ds/symlink/ads1118.pdf
• Product page: https://www.ti.com/product/ADS1118

FAQs

• What is the resolution of the Texas Instruments ADS1118IRUGT?
• 16‑bit.
• What converter architecture does it use?
• Delta‑Sigma (ΔΣ).
• What is the maximum sample rate?
• Up to 860 samples per second (SPS).
• How many inputs does it support?
• Up to four single‑ended or two differential inputs via the internal multiplexer.
• What digital interface is provided?
• An SPI‑compatible serial interface.
• Does it include any integrated sensors?
• Yes, an internal temperature sensor useful for cold‑junction compensation.
• Is there an integrated PGA?
• Yes. The programmable gain amplifier helps match input signal levels to the ADC range.
• What package is the ADS1118IRUGT offered in?
• 10‑pin X2QFN with package code RUG; shipping is Tape & Reel (TR).
• What is the lifecycle status?
• Active, per the Texas Instruments product page in the provided information.
• Is RoHS or other environmental compliance documented here?
• Not specified in the provided data. Consult TI’s product page for the latest compliance details.

By combining 16‑bit delta‑sigma conversion, an SPI‑compatible interface, on‑chip temperature sensing, and a flexible input mux in a tiny X2QFN package, the Texas Instruments ADS1118IRUGT helps engineers deliver precise, space‑efficient measurements with fewer external parts and faster time to prototype and production.