Texas Instruments ADS1232IPWG4

Overview

ADS1232IPWG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter optimized for bridge sensor front-ends, featuring two differential input channels, an integrated temperature sensor, selectable PGA gains of 1/2/64/128, and 10SPS or 80SPS data rates. It delivers 23.5-bit effective resolution at gain=1 and supports ratiometric measurements with external reference up to 5V in weigh scale and industrial pressure sensing systems.

For engineers reviewing the ADS1232IPWG4 datasheet, ADS1232IPWG4 pinout, ADS1232IPWG4 application, or ADS1232IPWG4 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed application roles, and two rigorously cross-checked alternative parts for bridge-sensor ADC selection.

Technical Context

The ADS1232IPWG4 integrates a chopper-stabilized low-noise PGA, third-order delta-sigma modulator, and fourth-order digital filter - all clocked by either internal oscillator or external crystal (0.2–8 MHz). Its input multiplexer selects between AINP1/AINN1, AINP2/AINN2, or internal temperature sensor via dedicated A0 and TEMP pins, with no register programming required.

Offset calibration is initiated by toggling SCLK; standby and power-down modes are controlled directly via PDWN and SCLK. The two-wire serial interface outputs MSB-first data on DRDY/DOUT synchronized to SCLK rising edges, enabling direct connection to MSP430 and other microcontrollers without protocol overhead.

Key Specifications

Pinout & Package

TSSOP-24 package (7.8 mm × 6.4 mm), lead pitch 0.65 mm, thermally enhanced for stable performance in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bridge-sensor ADC applications.

Compared with ADS1230IPW, ADS1232IPWG4 adds a second differential input and temperature sensor at minimal cost premium, enabling dual-load-cell redundancy or thermal drift correction; versus AD7792BRUZ, it eliminates register initialization and provides deterministic pin-driven timing - critical for metrology-grade repeatability in weighing instruments.

Availability

ADS1232IPWG4 is available at Aetrix Electronics and suitable for industrial weigh scales, PLC weight modules, and pressure sensor signal conditioning requiring stable component supply, long-term lifecycle support, and traceable sourcing for ISO 9001-certified production.

Supply support for ADS1232IPWG4 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 sensor interface solutions.

The ADS123x product line was designed specifically for high-accuracy bridge sensor measurement in industrial weighing, strain gauge, and pressure transducer applications - emphasizing simplicity, noise immunity, and deterministic timing over software configurability.

FAQ

What is the maximum achievable noise-free resolution of ADS1232IPWG4 at 10SPS and PGA gain = 64?

The ADS1232IPWG4 achieves 19.2 bits noise-free resolution at 10SPS and PGA gain = 64, measured with 5V reference and AVDD = 5V. This corresponds to 125 nV peak-to-peak input-referred noise, enabling stable 16-bit clean code resolution for high-gain bridge sensor outputs in industrial environments.

Does ADS1232IPWG4 require external memory or register configuration to operate?

No - ADS1232IPWG4 operates without registers or firmware initialization. All functions including gain selection (GAIN1/GAIN0), data rate (SPEED), channel selection (A0/TEMP), and offset calibration (SCLK toggle) are controlled directly by pin states, making ADS1232IPWG4 ideal for safety-critical or resource-constrained microcontroller systems.

Can ADS1232IPWG4 interface directly with a 3.3V microcontroller's GPIO and serial interface?

Yes - ADS1232IPWG4 supports digital I/O voltage levels compatible with 3.3V systems: VIH = 0.7 × DVDD (min 2.31V), VIL = 0.2 × DVDD (max 0.66V), and VOL = 0.2 × DVDD (max 0.66V) at 1 mA load. Its two-wire interface requires only DRDY/DOUT and SCLK connections to a 3.3V MCU.

How does the internal temperature sensor in ADS1232IPWG4 function, and what accuracy can be expected?

The ADS1232IPWG4 integrates matched on-die diodes (1×/80× current scaling) that generate a voltage difference of 111.7 mV at 25°C with 379 µV/°C coefficient. When TEMP pin is high, the PGA measures this delta; at gain = 1, resolution is ~0.3°C over –40°C to +105°C, enabling real-time thermal drift compensation in weigh scale firmware.

What is the purpose of the CAP pins (9 and 10) on ADS1232IPWG4, and what capacitor value is required?

Pins 9 and 10 (CAP) connect a 0.1 µF ceramic capacitor across them to stabilize the internal PGA bias network. This capacitor is mandatory for specified noise performance and gain accuracy - omitting it degrades RMS noise by >3× and introduces gain nonlinearity exceeding ±0.1% FSR at gain = 128.