Texas Instruments ADS1247IPW

Overview

ADS1247IPW from Texas Instruments is a 24-bit, 2-kSPS delta-sigma analog-to-digital converter with integrated programmable gain amplifier (PGA), internal 2.048-V reference (10 ppm/°C max drift), dual matched excitation current sources (50–1500 µA), and 4-channel analog multiplexer for RTD, thermocouple, and bridge sensor front-ends. It operates from 2.7 V to 5.25 V analog supply and supports unipolar/bipolar configurations.

For engineers reviewing the ADS1247IPW datasheet, ADS1247IPW pinout, ADS1247IPW application, or ADS1247IPW equivalent, key selection considerations include its single-cycle settling digital filter, simultaneous 50/60-Hz rejection at 20 SPS, sensor burn-out detection, 4 GPIOs, and integrated system monitoring of AVDD, DVDD, and VREF.

Technical Context

The ADS1247IPW implements a third-order delta-sigma modulator with a single-cycle settling sinc³ digital filter, enabling fast channel cycling across its 4 differential input channels. Its PGA offers selectable gains of 1–128 V/V and delivers 48 nV_RMS noise at gain = 128.

It integrates two matched IDACs (±1% absolute error, ±0.15% mismatch), burn-out current sources (0.5/2/10 µA), an internal temperature sensor (405 µV/°C coefficient), and voltage monitoring for AVDD, DVDD, and VREF - all controlled via SPI-compatible serial interface with DRDY/DOUT shared pin.

Key Specifications

Pinout & Package

TSSOP-20 package (6.50 mm × 4.40 mm) with 0.65-mm pitch; thermally enhanced for industrial ambient operation up to +105°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1247IPW, ADS1248IPW extends channel density without sacrificing accuracy or integration, while ADS1220IPWR trades integrated features for reduced quiescent current and smaller footprint - making it suitable for battery-powered edge nodes where sensor count is limited.

Availability

ADS1247IPW is available at Aetrix Electronics and suitable for RTD temperature monitoring, thermocouple measurement, and pressure transducer interface requiring stable component supply across industrial OEM production cycles.

Supply support for ADS1247IPW 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 chain solutions.

The ADS124x family was designed specifically for high-accuracy sensor measurement systems - integrating PGA, reference, IDACs, burn-out detection, and system monitoring to replace discrete front-end components in temperature, pressure, and flow instrumentation.

FAQ

What is the maximum data rate supported by the ADS1247IPW?

The ADS1247IPW supports configurable data rates from 5 SPS up to 2000 SPS. At 2000 SPS, the device maintains 24-bit resolution with single-cycle settling, enabling rapid scanning across its 4 analog input channels without latency penalties. This capability is essential for real-time multiplexed sensor systems such as multi-point temperature arrays in process control panels.

Does the ADS1247IPW include an internal voltage reference?

Yes, the ADS1247IPW integrates a precision 2.048-V internal voltage reference with a maximum drift of 10 ppm/°C from 25°C to 105°C. This reference is factory-trimmed and supports both ratiometric and absolute measurement modes. It eliminates the need for external reference ICs in most industrial sensor applications, reducing BOM cost and PCB area while maintaining stability under thermal stress.

How many analog input channels does the ADS1247IPW support?

The ADS1247IPW supports four independently selectable analog input channels (AIN0 through AIN3), each configurable as differential pairs or single-ended inputs. These channels are routed through an integrated analog multiplexer that also supports sensor burn-out detection and voltage bias generation. The device does not support more than four inputs - unlike the ADS1248IPW, which offers eight channels.

Can the ADS1247IPW perform simultaneous 50-Hz and 60-Hz line-frequency rejection?

Yes, the ADS1247IPW's sinc³ digital filter provides simultaneous 50-Hz and 60-Hz rejection at data rates of 20 SPS or lower. This is achieved through inherent notch placement in the filter response, requiring no additional firmware or external filtering components. The feature is critical for accurate measurements in globally deployed equipment operating in regions with differing mains frequencies.

What GPIO capabilities does the ADS1247IPW provide?

The ADS1247IPW provides four general-purpose I/O pins (GPIO0–GPIO3), implemented as REFP0/GPIO0, REFN0/GPIO1, AIN2/IEXC/GPIO2, and AIN3/IEXC/GPIO3. Each can be configured as digital input or output under register control, supporting functions such as sensor enable/disable, status indication, or interrupt signaling. These GPIOs share pins with analog or reference functions and must be disabled in analog mode to avoid interference.