Texas Instruments ADS1258IRTCTG4

Overview

ADS1258IRTCTG4 from Texas Instruments is a 16-channel, 24-bit delta-sigma analog-to-digital converter with single-cycle settled data at up to 23.7 kSPS per channel, ±2.5 V bipolar or +5 V unipolar operation, 2.8 µV_RMS noise at 1.8 kSPS, and integrated system monitoring (temperature, supply, reference, gain, offset). It serves as the high-precision front-end ADC in multi-channel industrial data acquisition systems requiring fast scan and low drift.

For engineers reviewing the ADS1258IRTCTG4 datasheet, ADS1258IRTCTG4 pinout, ADS1258IRTCTG4 application, or ADS1258IRTCTG4 equivalent, key selection criteria include fixed/auto-scan data rate configuration, on-chip sensor bias current sources (1.5 µA/24 µA), SPI interface timing compliance (up to 16 MHz), and QFN-48 thermal pad grounding requirements.

Technical Context

The ADS1258IRTCTG4 integrates a fourth-order delta-sigma modulator followed by a fifth-order sinc digital filter optimized for low-noise performance, delivering no missing codes across its 24-bit output. Its flexible 16-input multiplexer supports eight differential or 16 single-ended configurations with programmable sensor bias current sources and open-sensor detection capability.

Onboard PLL generates 15.729 MHz system clock from a 32.768 kHz crystal (XTAL1/XTAL2), or accepts external clock via CLKIO. The MUXOUTP/MUXOUTN differential outputs enable external signal conditioning prior to ADCINP/ADCINN, while internal readback registers provide real-time temperature, AVDD/AVSS, VREF, offset, and gain monitoring.

Key Specifications

Pinout & Package

ADS1258IRTCTG4 is housed in a thermally enhanced 48-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad internally connected to AVSS. The package supports high-density PCB layouts and requires soldering the thermal pad to a solid AVSS plane for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution multi-channel ADC applications.

Compared with ADS1256IPWR and AD7768-1ACPZ, the ADS1258IRTCTG4 uniquely combines 16-channel integration, on-chip system monitoring, programmable sensor bias, and auto-scan capability in a single QFN-48 package-reducing total component count and firmware complexity for fast-scan multi-sensor systems.

Availability

ADS1258IRTCTG4 is available at Aetrix Electronics and suitable for industrial process monitoring, medical diagnostic equipment, avionics sensor data acquisition, and test & measurement systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS1258IRTCTG4 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 industrial-grade signal chain solutions.

The ADS1258IRTCTG4 belongs to TI's high-precision delta-sigma ADC product line, designed specifically for fast-scan, multi-channel industrial and medical instrumentation where resolution, channel density, and integrated diagnostics are critical.

FAQ

What is the maximum auto-scan data rate supported by the ADS1258IRTCTG4?

The ADS1258IRTCTG4 supports a maximum auto-scan data rate of 23.7 kSPS per channel, enabling a complete 16-channel acquisition cycle in under 700 µs. This rate is achieved using the internal PLL clock derived from the 32.768 kHz crystal or an external clock source, and is confirmed in the SBAS297G datasheet Table 1 under "Data Rate, Auto-Scan Mode".

Does the ADS1258IRTCTG4 require an external reference voltage?

No-the ADS1258IRTCTG4 does not require an external reference, but it does require externally applied VREFP and VREFN pins to define the reference voltage. It has no internal reference; the device operates with an external differential reference (0.5 V to AVDD–AVSS), and the reference input impedance is approximately 40 kΩ at 16 MHz, as specified in the Electrical Characteristics table.

How is the thermal pad of the ADS1258IRTCTG4 QFN package connected?

The exposed thermal pad of the ADS1258IRTCTG4 QFN-48 package is internally connected to AVSS, and must be soldered to a solid AVSS copper plane on the PCB for optimal thermal dissipation and noise performance. TI's layout guidelines recommend minimum 10× thermal vias (0.3 mm diameter) connecting the pad to inner-layer AVSS planes.

Can the ADS1258IRTCTG4 perform open-sensor detection?

Yes-the ADS1258IRTCTG4 supports open-sensor detection using its programmable sensor bias current sources (1.5 µA or 24 µA). When bias is applied to a sensor and no return current is measured, the resulting out-of-range ADC reading triggers fault detection. This function is documented in the Features list and Applications section of the SBAS297G datasheet.

What power supply configurations does the ADS1258IRTCTG4 support?

The ADS1258IRTCTG4 supports dual analog supplies (AVDD = +2.5 V, AVSS = –2.5 V) for ±2.5 V bipolar operation or single analog supply (AVDD = +5 V, AVSS = 0 V) for +5 V unipolar operation, plus a separate digital supply DVDD from 2.7 V to 5.25 V. Absolute maximum ratings specify AVDD to AVSS ≤ +5.5 V and AVSS ≥ –2.6 V.