Texas Instruments ADS1018IRUGR

Overview

ADS1018IRUGR from Texas Instruments is a 12-bit, delta-sigma analog-to-digital converter with integrated PGA, internal voltage reference, temperature sensor (±2°C max error), oscillator, and SPI interface. It supports four single-ended or two differential inputs, operates from 2 V to 5.5 V, delivers up to 3300 SPS, and achieves 12-bit noise-free resolution in an ultrasmall 2 mm × 1.5 mm X2QFN-10 package-ideal for thermocouple cold-junction compensation and portable sensor measurement systems.

For engineers reviewing the ADS1018IRUGR datasheet, ADS1018IRUGR pinout, ADS1018IRUGR application, or ADS1018IRUGR equivalent, key selection considerations include its programmable gain (±0.256 V to ±6.144 V FSR), single-shot power-down current (≤2 μA), on-chip temperature sensing accuracy, SPI timing compliance (min 250 ns SCLK period), and operation across –40°C to +125°C ambient.

Technical Context

The ADS1018IRUGR implements a delta-sigma ADC core with a 250 kHz modulator frequency derived from an internal 1-MHz oscillator, enabling single-cycle settling and strong common-mode rejection. Its input multiplexer supports configurable AIN0–AIN3 routing for differential (AIN0–AIN1, AIN2–AIN3) or single-ended measurements, with internal GND connection for negative input in single-ended mode.

Conversion modes include continuous (programmable 128–3300 SPS) and single-shot (auto power-down post-conversion), reducing idle current to ≤2 μA. The integrated PGA provides six gain settings, and the internal low-drift voltage reference eliminates external component requirements while contributing to total gain error (±0.25%) and drift (5–7 ppm/°C).

Key Specifications

Pinout & Package

ADS1018IRUGR is packaged in a 10-pin X2QFN (RUG) measuring 2.00 mm × 1.50 mm × 0.40 mm, with wettable flanks for automated optical inspection. Thermal resistance R_θJA is 245.2°C/W, supporting operation up to +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital converter applications.

Compared with ADS1118IRUGR, the ADS1018IRUGR trades resolution for speed and lower power; compared with MCP3208-CI/P, it integrates signal conditioning and thermal sensing at the cost of raw throughput-making ADS1018IRUGR optimal for compact, low-power, multi-function sensor nodes where integration reduces system-level design risk.

Availability

ADS1018IRUGR is available at Aetrix Electronics and suitable for thermocouple measurement systems, portable instrumentation, and factory automation sensors requiring stable component supply, extended temperature operation, and long-term production continuity.

Supply support for ADS1018IRUGR 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 sensor interface solutions.

The ADS1018IRUGR belongs to TI's precision delta-sigma ADC product line, designed specifically for space- and power-constrained sensor measurement applications-including industrial process control, portable test equipment, and IoT endpoint devices.

FAQ

What is the maximum operating temperature for the ADS1018IRUGR?

The ADS1018IRUGR is specified for operation from –40°C to +125°C ambient temperature. Its junction temperature must not exceed +150°C, and thermal design should account for R_θJA = 245.2°C/W in the X2QFN-10 (RUG) package. At 125°C ambient and 150 μA supply current, self-heating remains below 10°C under typical PCB conditions-ensuring reliable performance in enclosed industrial environments.

Does the ADS1018IRUGR support external voltage references?

No, the ADS1018IRUGR does not support external voltage references. It integrates a low-drift internal reference, and the reference voltage cannot be overridden or bypassed. All gain and offset specifications-including gain error (±0.25%) and drift (5–7 ppm/°C)-are referenced to this internal source, simplifying layout but limiting flexibility for ultra-high-precision calibration schemes requiring external 10-V references.

How does the ADS1018IRUGR handle unused analog inputs?

Unused analog inputs (AIN0–AIN3) on the ADS1018IRUGR must be either left unconnected or tied to VDD-not to GND-to prevent unintended biasing through internal ESD diodes. Overdriving unused pins beyond GND–0.3 V to VDD+0.3 V may affect conversions on active channels due to substrate coupling; external Schottky clamping is recommended if overvoltage risk exists.

Can the ADS1018IRUGR measure negative voltages?

No, the ADS1018IRUGR cannot measure negative voltages relative to GND. Its analog inputs are rail-to-rail but limited to GND–0.3 V to VDD+0.3 V. Differential measurements yield signed 12-bit results only when V(AINP) – V(AINN) is negative-but the absolute voltage on each pin must remain within the supply rails. For true bipolar input capability, an external level-shifting circuit is required.

What SPI timing parameters are critical for reliable ADS1018IRUGR communication?

Critical SPI timing parameters for the ADS1018IRUGR include minimum SCLK period (250 ns), setup/hold times for DIN relative to SCLK falling edge (50 ns each), and CS pulse width (≥200 ns high). Violating t_CSSC (CS-to-first-SCLK delay ≥100 ns) or t_SCCS (final-SCLK-to-CS rise ≥100 ns) may cause command loss or register corruption-especially during configuration writes to the Config register.