Texas Instruments ADS1243IPWR

Overview

ADS1243IPWR from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with integrated PGA, on-chip calibration, and simultaneous 50/60Hz rejection. It delivers 21-bit effective resolution at PGA=1, supports up to eight analog input channels or data I/O pins, operates from 2.7V to 5.25V, and consumes only 600µW at full performance - designed for high-precision sensor signal conditioning in industrial instrumentation.

For engineers reviewing the ADS1243IPWR datasheet, ADS1243IPWR pinout, ADS1243IPWR application, or ADS1243IPWR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and packaging differences.

Technical Context

The ADS1243IPWR implements a second-order delta-sigma modulator with a programmable 1279-tap FIR filter, enabling single-cycle settling and simultaneous 50Hz/60Hz notch rejection (≥–90dB). Its multiplexed 8-channel input architecture supports configurable differential or single-ended acquisition, with chopper-stabilized input buffering delivering 5GΩ impedance when enabled.

It integrates a programmable gain amplifier (1–128×), an 8-bit offset DAC (±VREF/(2·PGA) range), burnout current sources (2µA), and SPI-compatible serial interface with DRDY handshake. Calibration commands (SELFCAL, SYSOCAL, SYSGCAL) correct both internal and system-level offset/gain errors without requiring external components.

Key Specifications

Pinout & Package

TSSOP-20 package (4.4mm × 6.5mm, 0.65mm pitch), thermally enhanced for stable operation in industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.

Compared with ADS1242IPW and AD7192BRUZ, the ADS1243IPWR uniquely combines 8-channel configurability, integrated burnout detection, and external differential reference support - making it the only option among the three that satisfies simultaneous requirements for sensor diagnostics, ratiometric accuracy, and multi-sensor scalability in portable instrumentation.

Availability

ADS1243IPWR is available at Aetrix Electronics and suitable for industrial process control, liquid/gas chromatography, blood analysis, smart transmitters, and portable instrumentation requiring stable component supply and long-term manufacturability.

Supply support for ADS1243IPWR 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-grade signal chain solutions.

The ADS124x family was engineered specifically for high-resolution, low-noise measurement in harsh industrial and portable environments - emphasizing robust ESD tolerance, wide supply range, and integrated diagnostics for sensor interface reliability.

FAQ

What is the maximum sampling rate achievable with ADS1243IPWR?

The ADS1243IPWR supports programmable output data rates of 3.75Hz, 7.5Hz, and 15Hz when using a 2.4576MHz crystal. At higher master clock frequencies (e.g., 4.9152MHz), the maximum data rate reaches 30Hz. These rates are fixed by the FIR filter configuration and cannot be increased beyond the specified values without compromising 50/60Hz rejection performance. The ADS1243IPWR does not support continuous variable-rate sampling.

Does ADS1243IPWR require an external crystal, or can it use an external clock source?

The ADS1243IPWR accepts either a parallel-resonant crystal (2.4576MHz or 4.9152MHz) connected between XIN and XOUT, or a single-ended CMOS clock signal applied to XIN with XOUT left unconnected. Crystal operation requires external load capacitors (0–20pF each); external clock mode bypasses XOUT entirely and supports clock frequencies up to 5MHz. Both methods are fully supported per the ADS1243IPWR datasheet.

How does the burnout current feature work on ADS1243IPWR?

The ADS1243IPWR includes two 2µA burnout current sources - one tied to AIN+ and one to AIN–. When enabled via the SETUP register, they force open-circuit sensors to rail (outputting 0x7FFFFF) and shorted sensors to mid-scale (~0x000000), enabling automatic fault detection. This function operates independently of PGA setting and remains active during conversions, providing real-time sensor health monitoring without software overhead.

Can ADS1243IPWR operate with a 3.3V supply and still achieve 24-bit performance?

Yes - the ADS1243IPWR is fully specified from 2.7V to 5.25V. At VDD = 3.3V, it maintains 24-bit no missing codes, ±0.0015% INL, and 21-bit effective resolution (PGA = 1), with typical current consumption of 240–375µA (buffer ON). Reference input range adjusts accordingly: 0.1V–1.25V (RANGE=0) or 0.1V–2.5V (RANGE=1), preserving full ratiometric accuracy for 3.3V-system sensor interfaces.

What is the purpose of the offset DAC in ADS1243IPWR, and how is it calibrated?

The 8-bit offset DAC in ADS1243IPWR shifts the PGA input by ±VREF/(2·PGA), enabling software-based zero-point adjustment without external op-amps. It is calibrated alongside the main ADC path: during SELFCAL, SYSOCAL, or SYSGCAL, the DAC is automatically nulled. For best results, disable the DAC before calibration and re-enable afterward - its gain error (±10%) and drift (1–2 ppm/°C) are corrected only when used in conjunction with system-level calibration routines.