Texas Instruments ADS1148IPW

Overview

ADS1148IPW from Texas Instruments is a 16-bit, 2-kSPS delta-sigma analog-to-digital converter (ADC) with integrated programmable gain amplifier (PGA), dual matched excitation current sources (IDACs), 8-channel analog multiplexer, and internal 2.048-V reference. It supports RTD, thermocouple, and bridge sensor measurement with simultaneous 50/60-Hz rejection at 20 SPS and single-cycle settling for fast channel cycling.

For engineers reviewing the ADS1148IPW datasheet, ADS1148IPW pinout, ADS1148IPW application, or ADS1148IPW equivalent, key selection considerations include its TSSOP-28 package, 8 configurable analog inputs with burn-out detection, PGA gain range of 1–128 V/V, SPI-compatible serial interface, and integrated system monitoring (VREF/DVDD/AVDD).

Technical Context

The ADS1148IPW implements a third-order delta-sigma modulator with a single-cycle settling digital filter, enabling deterministic conversion timing across all data rates up to 2 kSPS. Its input multiplexer integrates burn-out current sources, voltage bias generation, and GPIO functionality on eight analog input pins (AIN0–AIN7), each configurable as IEXC output or digital I/O.

It features two independent, matched IDACs (50–1500 µA) with ±1% absolute error and ±0.2% mismatch, plus an internal oscillator (4.096 MHz nominal) eliminating external clock requirements. The device supports unipolar (2.7–5.25 V) or bipolar (±2.5 V) analog supplies and includes self/system calibration, temperature sensor, and power/reference monitoring.

Key Specifications

Pinout & Package

TSSOP-28 (PW) package: 9.70 mm × 4.40 mm body, 0.65 mm pitch, exposed thermal pad (pin 28 connected to AVSS). Compatible with standard surface-mount reflow processes and offers improved thermal performance over smaller TSSOP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1147IPW, the ADS1148IPW adds four analog input channels and four GPIOs in the same TSSOP footprint family, while ADS1248IPW delivers 8 additional bits of resolution at the expense of higher power and cost - making ADS1148IPW optimal for cost-sensitive, multi-sensor industrial systems requiring 16-bit fidelity.

Availability

ADS1148IPW is available at Aetrix Electronics and suitable for RTD temperature measurement, thermocouple signal conditioning, and resistive bridge pressure sensing requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for ADS1148IPW 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and sensor interface solutions.

The ADS114x product line is designed specifically for high-accuracy, low-power sensor measurement in industrial automation, process control, and test equipment - integrating signal conditioning, excitation, and digitization into a single IC to minimize system complexity.

FAQ

What is the maximum data rate supported by the ADS1148IPW?

The ADS1148IPW supports data rates from 5 SPS up to 2000 SPS in 10 discrete steps. At 2000 SPS, the device maintains 16-bit effective resolution with typical RMS noise of 1.2 µV. The digital filter settles in a single cycle across all rates, enabling deterministic timing for real-time control loops and fast channel cycling across its 8 analog inputs.

Does the ADS1148IPW require an external clock source?

No, the ADS1148IPW includes an internal oscillator with nominal frequency of 4.096 MHz, which is sufficient for all standard data rates and eliminates the need for an external crystal or clock generator. An external clock (1–4.5 MHz) may be used via the CLK pin if tighter frequency tolerance or synchronization with other system clocks is required.

How does the ADS1148IPW support RTD measurements with burn-out detection?

The ADS1148IPW integrates dedicated burn-out current sources (0.5, 2, or 10 µA) that can be enabled on any analog input pin. When configured, these sources inject current into the RTD path and monitor resulting voltage - detecting open circuits by absence of expected voltage drop. This function operates independently of conversion and requires no external components.

Can the ADS1148IPW operate with a bipolar analog supply?

Yes, the ADS1148IPW supports bipolar analog supplies of ±2.5 V (AVDD = +2.5 V, AVSS = –2.5 V), enabling direct digitization of bipolar sensor outputs such as certain strain gauges or AC-coupled signals. In this mode, the common-mode input range centers at 0 V, and the internal reference remains functional with appropriate decoupling to VREFCOM.

What GPIO capabilities does the ADS1148IPW provide?

The ADS1148IPW provides up to eight GPIOs: AIN2–AIN7 double as GPIO2–GPIO7, and REFP0/REFN0 double as GPIO0/GPIO1. All are software-configurable as inputs or outputs with programmable pull-up/down and interrupt capability. These GPIOs support sensor enable/disable sequencing, status indication, and auxiliary control - reducing need for external I/O expanders.