Texas Instruments ADS1120IRVAT

Overview

ADS1120IRVAT from Texas Instruments is a 16-bit, 2kSPS precision delta-sigma ADC with integrated PGA (gain up to 128), dual programmable current sources (50μA–1.5mA), internal 2.048V reference (5ppm/°C drift), and SPI interface - designed for high-accuracy measurement of low-level sensor signals including RTDs, thermocouples, and bridge sensors in industrial field transmitters.

For engineers reviewing the ADS1120IRVAT datasheet, ADS1120IRVAT pinout, ADS1120IRVAT application, or ADS1120IRVAT equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-ready procurement details - all grounded in TI's SBAS535D production data sheet (Rev. June 2026).

Technical Context

The ADS1120IRVAT implements a delta-sigma modulator with single-cycle settling digital filter enabling simultaneous 50Hz/60Hz rejection at 20SPS. Its flexible MUX supports two differential or four single-ended inputs, and the PGA can be bypassed to retain high input impedance while supporting gains of 1–4 for single-ended configurations.

It integrates dual matched IDACs for ratiometric sensor excitation, a precision temperature sensor (±0.5°C accuracy), low-side power switch (RON = 3.5Ω), and internal oscillator (±1% accuracy). Operation spans –40°C to +125°C with AVDD/DVDD from 2.3V to 5.5V and supports unipolar or bipolar analog supplies.

Key Specifications

Pinout & Package

VQFN-16 (RVA) package: 3.5 mm × 3.5 mm, leadless, thermal pad on underside (to be connected to AVSS or left floating per TI layout guidelines).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1220IPWR and ADS114S08IPBS, the ADS1120IRVAT uniquely combines 16-bit precision, integrated IDACs, temperature sensor, and ultra-low 120µA duty-cycle power - making it the most integrated, drop-in solution for industrial sensor signal chains requiring minimal external components.

Availability

ADS1120IRVAT is available at Aetrix Electronics and suitable for field transmitters, PLC analog input modules, and patient monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADS1120IRVAT 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 industrial signal conditioning.

The ADS1120IRVAT belongs to TI's precision delta-sigma ADC portfolio, engineered specifically for high-accuracy, low-power industrial sensing - targeting applications where integration, reliability, and long-term stability outweigh raw resolution.

FAQ

What is the maximum achievable data rate for ADS1120IRVAT in turbo mode?

The ADS1120IRVAT achieves up to 2000 samples per second (SPS) in turbo mode with the internal oscillator enabled. This mode trades off some noise performance for speed and is confirmed in Section 6.5 of the SBAS535D datasheet. At 2000 SPS, the device maintains 16-bit no-missing-codes resolution but with reduced effective number of bits (ENOB) compared to lower rates like 20 SPS. The ADS1120IRVAT supports three operational modes - normal, duty-cycle, and turbo - each with distinct timing and power profiles.

Does ADS1120IRVAT support bipolar analog supply operation?

Yes, the ADS1120IRVAT supports true bipolar analog supply operation with AVDD = +2.5V and AVSS = –2.5V, as specified in Section 6.3 Recommended Operating Conditions. This allows direct measurement of bipolar sensor outputs such as strain gauge bridges without external level-shifting circuitry. The device maintains full 16-bit performance and specified INL/offset accuracy under bipolar conditions, and the internal PGA remains functional across the full common-mode range defined for each gain setting.

How does the internal temperature sensor in ADS1120IRVAT improve thermocouple measurement accuracy?

The ADS1120IRVAT's internal temperature sensor provides ±0.5°C accuracy from –40°C to +125°C, enabling precise cold-junction compensation (CJC) for thermocouple measurements without external sensors. When used with the K-type thermocouple example in Section 9.2.1, the ADS1120IRVAT reads its own die temperature synchronously with thermocouple voltage, eliminating thermal gradients and wiring errors inherent in remote CJC solutions. This integrated approach directly improves overall system accuracy to within ±1.5°C over the full –200°C to +1250°C range.

Can ADS1120IRVAT operate without an external reference?

Yes, the ADS1120IRVAT includes a factory-trimmed 2.048V internal reference with 5 ppm/°C typical drift and ±3 mV initial accuracy at 25°C. It is fully functional for high-accuracy measurements without any external reference component. The device also supports external references up to AVDD–AVSS on REFP0/REFN0, allowing users to trade off stability (internal) versus absolute accuracy (external 10ppm/VREF reference). All gain, data rate, and filtering features operate identically regardless of reference source.

What are the valid SPI mode and timing requirements for ADS1120IRVAT?

The ADS1120IRVAT uses SPI Mode 1 (CPOL = 0, CPHA = 1), with SCLK idle low and data sampled on the rising edge. Minimum SCLK period is 150 ns (6.67 MHz max), and setup/hold times for DIN are 50 ns/25 ns respectively. CS must remain low for entire byte transfer, and t_CSSC (CS fall to first SCLK rise) is 50 ns minimum. These values are validated in Sections 6.6 and 6.7 of the SBAS535D datasheet and apply across the full –40°C to +125°C operating range and 2.3V–5.5V supply.