Texas Instruments ADS1258IRTCT

Overview

ADS1258IRTCT from Texas Instruments is a 16-channel, 24-bit delta-sigma analog-to-digital converter (ADC) with single-cycle settled data, fixed-channel scan up to 125 kSPS, auto-scan up to 23.7 kSPS per channel, ±2.5V bipolar or +5V unipolar operation, and integrated multiplexer output for external signal conditioning - deployed in high-precision medical instrumentation and industrial process monitoring systems.

For engineers reviewing the ADS1258IRTCT datasheet, ADS1258IRTCT pinout, ADS1258IRTCT application, or ADS1258IRTCT equivalent, this page delivers verified technical context, QFN-48 package mapping, SPI interface timing constraints, on-chip system monitoring registers, and validated alternative ADCs for multi-channel, low-noise, fast-scan measurement designs.

Technical Context

The ADS1258IRTCT integrates a fourth-order delta-sigma modulator followed by a fifth-order sinc digital filter optimized for low-noise performance at selectable data rates (1.8–125 kSPS). Its 16:1 analog input multiplexer supports 16 single-ended or 8 differential inputs with programmable sensor bias current sources (1.5 µA or 24 µA) and open-sensor detection capability.

Onboard PLL generates 15.729 MHz system clock from 32.768 kHz crystal (XTAL1/XTAL2), with CLKIO configurable as input or buffered output. Internal monitoring registers provide real-time readback of temperature, AVDD/AVSS, VREF, offset, and gain - all accessible via SPI without external components.

Key Specifications

Pinout & Package

ADS1258IRTCT is housed in a thermally enhanced QFN-48 package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad connected internally to AVSS. Pin assignments are fully defined per TI SBAS297G Rev. MARCH 2011.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1258IRTCT, ADS1256IPWR trades channel count and integrated clocking for smaller footprint and lower cost, while AD7768-1BCPZ offers higher sample rate per channel but demands external signal routing and bias generation - making ADS1258IRTCT optimal for compact, self-contained 16-channel precision DAQ.

Availability

ADS1258IRTCT is available at Aetrix Electronics and suitable for medical instrumentation, industrial process control, avionics data acquisition, and test & measurement systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS1258IRTCT 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 conversion and industrial-grade IC design.

The ADS1258IRTCT belongs to TI's high-precision delta-sigma ADC product line, engineered specifically for fast-scan, multi-channel, low-drift measurement systems in harsh environments - emphasizing integrated diagnostics, system-level synchronization, and minimal external component count.

FAQ

What is the maximum channel scan rate achievable with ADS1258IRTCT in Auto-Scan mode?

The ADS1258IRTCT achieves a maximum auto-scan data rate of 23.7 kSPS per channel, completing a full 16-channel acquisition sequence in under 670 µs. This performance is guaranteed across the full operating temperature range (–40°C to +105°C) and requires no external timing components when using the internal crystal oscillator. The ADS1258IRTCT's single-cycle settled architecture ensures deterministic timing without inter-channel settling delays.

Does ADS1258IRTCT support both unipolar and bipolar analog input ranges?

Yes, the ADS1258IRTCT supports true bipolar operation with ±2.5V full-scale differential input range when powered with AVDD = +2.5V and AVSS = –2.5V, and unipolar operation with +5V full-scale range when powered with AVDD = +5V and AVSS = 0V. Input voltage limits remain AVSS – 100 mV to AVDD + 100 mV in both configurations, and the internal multiplexer preserves common-mode rejection regardless of selected mode.

How does the on-chip temperature sensor in ADS1258IRTCT improve system accuracy?

The ADS1258IRTCT integrates a calibrated on-die temperature sensor with ±0.5°C accuracy and 394 µV/°C output coefficient, enabling real-time thermal compensation of offset and gain drift in the host firmware. This eliminates the need for external temperature sensors and associated calibration routines, directly improving long-term measurement stability - especially critical in medical and avionics applications where thermal gradients affect sensor accuracy.

Can ADS1258IRTCT operate without an external crystal or clock source?

Yes, the ADS1258IRTCT includes an integrated 32.768 kHz crystal oscillator circuit. When CLKSEL is held low, the device drives XTAL1/XTAL2 with internal circuitry and generates a precise 15.729 MHz system clock (CLKIO output). No external crystal or clock generator is required for basic operation, though an external clock may be applied to CLKIO if CLKSEL is high - providing flexibility for system-level clock domain synchronization.

What is the purpose of the MUXOUTP and MUXOUTN pins on ADS1258IRTCT?

The MUXOUTP and MUXOUTN pins provide the differential output of the 16:1 analog input multiplexer prior to the ADC core, allowing external signal conditioning - such as filtering, amplification, or isolation - between the multiplexer and ADC inputs. This architecture decouples channel selection from signal path design, enabling high-fidelity acquisition of noisy or high-impedance sensors without degrading SNR through shared PCB routing or passive components inside the ADC package.